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Journal articles on the topic 'QZSS'

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Author: Grafiati

Published: 4 June 2021

Last updated: 26 January 2023

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1

Sekiguchi, N., M. Shikada, and T. Kanai. "ON THE EVALUATION OF GNSS COMPLEMENTARY BY USING QUASIZENITH SATELLITE OF JAPAN." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 3, 2016): 495–502. http://dx.doi.org/10.5194/isprsarchives-xli-b1-495-2016.

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The positional information has an important role in our lifestyle. People need to get positional information by GNSS. The satellite positioning must receive a signal from four or more satellites, however, most of Japanese country is covered with mountain and urban area has a lot of tall buildings. Then Japanese government launched QZS (Quasi Zenith Satellite) which is the first satellite of QZSS (Quasi Zenith Satellite System) in 2010. QZSS including QZS can improve positioning accuracy and reliability. QZS has 6 signals by using four kinds of frequency. These signals are the same frequency of GPS and GLONASS and so on. This paper was reported about the comparison of the positioning between GPS and QZSS.

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2

Sekiguchi, N., M. Shikada, and T. Kanai. "ON THE EVALUATION OF GNSS COMPLEMENTARY BY USING QUASIZENITH SATELLITE OF JAPAN." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 3, 2016): 495–502. http://dx.doi.org/10.5194/isprs-archives-xli-b1-495-2016.

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The positional information has an important role in our lifestyle. People need to get positional information by GNSS. The satellite positioning must receive a signal from four or more satellites, however, most of Japanese country is covered with mountain and urban area has a lot of tall buildings. Then Japanese government launched QZS (Quasi Zenith Satellite) which is the first satellite of QZSS (Quasi Zenith Satellite System) in 2010. QZSS including QZS can improve positioning accuracy and reliability. QZS has 6 signals by using four kinds of frequency. These signals are the same frequency of GPS and GLONASS and so on. This paper was reported about the comparison of the positioning between GPS and QZSS.

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3

Krasuski, Kamil. "CHARAKTERYSTYKA SYSTEMU WSPOMAGANIA POZYCJONOWANIA QZSS-ZENITH." Informatics Control Measurement in Economy and Environment Protection 6, no. 4 (December 18, 2016): 58–62. http://dx.doi.org/10.5604/01.3001.0009.5191.

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W artykule przedstawiono charakterystykę japońskiego systemu nawigacyjnego QZSS-Zenith do wspomagania pozycjonowania satelitarnego. Scharakteryzowano poszczególne segmenty systemu QZSS-Zenith oraz opisano również skalę czasu i układ odniesienia w systemie QZSS. W części badawczej artykułu przedstawiono rezultaty pozycjonowania satelitarnego z użyciem obserwacji GPS i QZSS.

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4

Kitamura, Mitsunori, Taro Suzuki, Yoshiharu Amano, and Takumi Hashizume. "Evaluation for Vehicle Positioning in Urban Environment Using QZSS Enhancement Function." Journal of Robotics and Mechatronics 24, no. 5 (October 20, 2012): 894–901. http://dx.doi.org/10.20965/jrm.2012.p0894.

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In this paper, we have evaluated the performance and availability enhancement of Quasi-Zenith Satellite System (QZSS) in urban environments. In urban environments, QZSS can be expected to be fairly effective because of the high elevation angle of satellite and enhancement functions. Therefore, we conducted performance and availability enhancement evaluation tests to verify thus. In performance enhancement evaluation test, in order to evaluate the improvement of GPS accuracy by L1 Submeter-class Augmentation with Integrity Function (L1-SAIF) broadcasted by QZSS satellite, we compared the positioning errors of only GPS positioning and L1-SAIF positioning in open sky environment. In availability enhancement evaluation test, we performed the static and kinematic observation test. In static observation test, in order to evaluate the improvement of GPS accuracy by availability enhancement, we observed GPS and QZSS statically in narrow-sky environment. And we compared the positioning errors of only GPS positioning and positioning using availability enhancement. In kinematic observation test, in order to evaluate the availability of QZSS based on the visibility of QZSS satellite in urban environment, we observed QZSS and SBAS from moving vehicle. And we compared the visibility of QZSS and SBAS satellites. From these evaluation tests, it was confirmed that the performance and availability enhancement of QZSS have high availability and effectiveness.

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5

Onanong, Narumol, Julongkorn Pattameak, Teerachet Mekpradab, Surachet Chinnapark, and Prasert Kenpankho. "QZSS L1 Bandwidth Frequency Filter Design for QZSS Receiver." ASEAN Journal of Science and Engineering 1, no. 1 (April 19, 2021): 27–32. http://dx.doi.org/10.17509/ajse.v1i1.33764.

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We present the design of bandpass filter on the frequency of the QZSS satellite, by providing bandwidth at the cut-off frequency equally to the bandwidth of the QZSS L1 with selecting the response characteristic on Butterworth maximally flat amplitude. Bandpass filter design using frequency of the QZSS L1 with bandwidth is 24MHz. The design procedure involves two steps, the first step is to find the required order of the filter, which we use 3rd order, and the second step is to find the scale factor that must be applied to the normalized parameter values. The Band-Pass Butterworth filler is a combination between low pass and high pass. For the Butterworth filter, the value of a resistor that has been used are 50Ω. Then go to find the capacitor and inductor and by using PSpice as the tools for the simulation. The results of the output of bandpass filter at -3dB was between 1563 and 1587MHz. And was bandwidth around 24MHz. The combination of the lowpass filter and high pass filter is to perform as the bandpass filter. Therefore, there are two combinations also in designing bandpass filter. The aim of this combination is to have an influence on the performance of bandpass filter. As a conclusion, this designed filter on the frequency of QZSS L1 is to be useful by using bandpass filter.

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Pattameak, Julongkorn, Narumon Onanong, Teerachet Makpradab, Surachet Chinnapark, and Prasert Kenpankho. "QZSS L5 Bandwidth Frequency Filter Design for QZSS Receiver." ASEAN Journal of Science and Engineering 2, no. 1 (June 23, 2021): 95–100. http://dx.doi.org/10.17509/ajse.v2i1.37778.

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The purpose of this study was to design QZSS L5 Bandwidth Frequency Filter for QZSS Receiver. We presented the configuration of the Butterworth bandpass filter by using PSpice as the tool for the simulation. Bandpass filter frequency of the QZSS L5 with bandwidth is designed in 25 MHz using the Butterworth filter which is presented in this article. These designed circuits are composed of the 3rd order. Moreover, the combination between low pass filter and high pass filter is performed as a bandpass filter. In conclusion, this designed filter on the frequency of QZSS L5 is to be useful by using the Butterworth bandpass filter.

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7

Xie, Wei, Guanwen Huang, Bobin Cui, Pingli Li, Yu Cao, Haohao Wang, Zi Chen, and Bo Shao. "Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks." Sensors 19, no. 23 (November 24, 2019): 5147. http://dx.doi.org/10.3390/s19235147.

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In the Global Navigation Satellite System (GNSS) community, the Quasi-Zenith Satellite System (QZSS) is an augmentation system for users in the Asia-Pacific region. However, the characteristics and performance of four QZSS satellite clocks in a long-term scale are unknown at present. However, it is crucial to the positioning, navigation and timing (PNT) services of users, especially in Asia-Pacific region. In this study, the characteristics and performance variation of four QZSS satellite clocks, which including the phase, frequency, frequency drift, fitting residuals, frequency accuracy, periodic terms, frequency stability and short-term clock prediction, are revealed in detail for the first time based on the precise satellite clock offset products of nearly 1000 days. The important contributions are as follows: (1) It is detected that the times of phase and frequency jump are 2.25 and 1.5 for every QZSS satellite clock in one year. The magnitude of the frequency drift is about 10−18. The periodic oscillation of frequency drift of J01 and J02 satellite clocks is found. The clock offset model precision of QZSS is 0.33 ns. (2) The two main periods of QZSS satellite clock are 24 and 12 hours, which is the influence of the satellite orbit; (3) The frequency stability of 100, 1000 and 10,000 s are 1.98 × 10−13, 6.59 × 10−14 and 5.39 × 10−14 for QZSS satellite clock, respectively. The visible “bump” is found at about 400 s for J02 and J03 satellite clocks. The short-term clock prediction accuracy of is 0.12 ns. This study provides a reference for the state monitoring and performance variation of the QZSS satellite clock.

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8

Ye, Hongjun, Xiaojun Jing, Liang Liu, Maolei Wang, Shuo Hao, Xingkang Lang, and Baoguo Yu. "Analysis of Quasi-Zenith Satellite System Signal Acquisition and Multiplexing Characteristics in China Area." Sensors 20, no. 6 (March 11, 2020): 1547. http://dx.doi.org/10.3390/s20061547.

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On the basis of realizing regional navigation, the Quasi-Zenith Satellite System (QZSS) has advanced navigation function, which leads to the broadcasting of more signals in a single frequency of QZSS signals. Current signal transmission technology cannot solve this problem, so it is necessary to design a signal multiplexing method. The current QZSS satellite interface document does not disclose the multiplexing modulation method of the signal transmission, which has a certain impact on the acquisition of high-precision observation data and further data processing. The iGMAS (International GNSS Monitoring & Assessment System) Monitoring and Evaluation Center of the 54th Research Institute of China Electronics Technology Group Corporation has used the low-distortion data acquisition and processing platform and refined signal software receiving processing algorithm of the iGMAS to complete the signal acquisition and analysis of QZSS satellites. Analysis of the multiplexing and modulation method and signal characteristics for the QZSS has been carried out, which can provide a reference for the design and data processing of high-precision receivers.

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9

Lau, Lawrence, Hiroaki Tateshita, and Kazutoshi Sato. "Impact of Multi-GNSS on Positioning Accuracy and Multipath Errors in High-Precision Single-Epoch Solutions – A Case Study in Ningbo China." Journal of Navigation 68, no. 5 (March 31, 2015): 999–1017. http://dx.doi.org/10.1017/s0373463315000168.

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Real-Time Kinematic (RTK) Global Positioning System (GPS) carrier phase-based precise positioning has been widely using in geodesy and surveying applications, and other high accuracy positioning and navigation applications in the last two decades. More Global Navigation Satellite Systems (GNSS) are being developed and it is usually expected that combining GNSS will have a positive impact on positioning accuracy. This paper describes a case study carried out at Ningbo in China on the impact of multi-GNSS on RTK single epoch solutions. Both GPS and GLONASS are fully operational now. Moreover, the Quasi-Zenith Satellite System (QZSS) can be observed at Ningbo. Currently, only one QZSS satellite “MICHIBIKI” is operational. This paper carries out an early assessment of the impact of QZSS on GPS and GLONASS single-epoch high precision positioning (i.e., single-epoch positioning accuracy assessment) and investigates the multipath errors in the GPS, GLONASS and QZSS multi-frequency data.

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10

Huo, Xiang, Xue Wang, Sen Wang, Xiaofei Chen, Ganghua Zhou, and Xiaochun Lu. "Receiving and Assessing L1C Signal for In-Orbit GPS III and QZSS Transmissions Using a Software-Defined Receiver." Electronics 9, no. 1 (December 21, 2019): 11. http://dx.doi.org/10.3390/electronics9010011.

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To avoid signal interference in L1 frequency and provide various services, GPS has updated a modern signal, called L1C, which has been tested with three QZSS satellites launched in 2017. In December 2018, the first GPS III satellite was launched, which implies improved joint positioning using GPS and QZSS L1C signal. The L1C signal offers a series of advanced designs in signal modulation, message structure and coding. We present complete methodologies for joint L1C signal receiving and processing. For the transmitted signals, we present a methodology and results from collecting and assessing Binary Offset Carrier (BOC) modulation and time-multiplexed BOC (TMBOC) modulation used in the L1C signal. Using the same omnidirectional antenna and test equipment, we collected the L1C signal in Xi’an and Sanya, China, respectively. The experiments in Xi’an verify the joint positioning method to complement the GPS III and QZSS satellite constellations. Our methodology evaluates the ranging difference and positioning error of BOC and TMBOC modulation under the same environment and satellite constellation configuration in Sanya. It is also verified that the joint positioning error is less than the QZSS-only positioning due to the optimization of the satellite constellation.

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11

Choy, Suelynn, Ken Harima, Yong Li, Mazher Choudhury, Chris Rizos, Yaka Wakabayashi, and Satoshi Kogure. "GPS Precise Point Positioning with the Japanese Quasi-Zenith Satellite System LEX Augmentation Corrections." Journal of Navigation 68, no. 4 (January 19, 2015): 769–83. http://dx.doi.org/10.1017/s0373463314000915.

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The Japanese Quasi-Zenith Satellite System (QZSS) is a regional satellite navigation system capable of transmitting navigation signals that are compatible and interoperable with other Global Navigation Satellite Systems (GNSS). In addition to navigation signals, QZSS also transmits augmentation signals, e.g. the L-band Experimental (LEX) signal. The LEX signal is unique for QZSS in delivering correction messages such as orbits and clock information that enable real-time Precise Point Positioning (PPP). This study aims to evaluate the availability of the LEX signal as well as the quality of the broadcast correction messages for real-time PPP applications. The system is tested in both static and kinematic positioning modes. The results show that the availability of the LEX signal is 60% when the QZSS satellite elevation is at 30° and above 90% when the satellite is above 40° elevation. Centimetre-level position accuracy can be obtained for static PPP processing after two hours of convergence using the current MADOCA-LEX (Multi-GNSS Advanced Demonstration of Orbit and Clock Analysis) correction messages transmitted on the LEX signal; and decimetre-level point positioning accuracy can be obtained for kinematic PPP processing.

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12

Iwata, Toshiaki, Takashi Matsuzawa, Kumiko Machita, and Akiyoshi Abei. "Remote Synchronization Experiments for Quasi-Zenith Satellite System Using Multiple Navigation Signals as Feedback Control." International Journal of Navigation and Observation 2011 (June 15, 2011): 1–10. http://dx.doi.org/10.1155/2011/849814.

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The remote synchronization system for the onboard crystal oscillator (RESSOX) is a remote control method that permits synchronization between a ground station atomic clock and Japanese quasi-zenith satellite system (QZSS) crystal oscillators. To realize the RESSOX of the QZSS, the utilization of navigation signals of QZSS for feedback control is an important issue. Since QZSS transmits seven navigation signals (L1C/A, L1CP, L1CD, L2CM, L2CL, L5Q, and L5I), all combinations of these signals should be evaluated. First, the RESSOX algorithm will be introduced. Next, experimental performance will be demonstrated. If only a single signal is available, ionospheric delay should be input from external measurements. If multiple frequency signals are available, any combination, except for L2 and L5, gives good performance with synchronization error being within two nanoseconds that of RESSOX. The combination of L1CD and L5Q gives the best synchronization performance (synchronization error within 1.14 ns). Finally, in the discussion, comparisons of long-duration performance, computer simulation, and sampling number used in feedback control are considered. Although experimental results do not correspond to the simulation results, the tendencies are similar. For the overlapping Allan deviation of long duration, the stability of 1.23×10−14 at 100,160 s is obtained.

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13

KUBO, Nobuaki, Falin WU, and Akio YASUDA. "Integral GPS and QZSS Ambiguity Resolution." TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 47, no. 155 (2004): 38–43. http://dx.doi.org/10.2322/tjsass.47.38.

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14

Hwang, Nam Eung, Ju Hyun Lee, and Il Kyu Kim. "Examination of Availability on QZSS SLAS in Korea." Journal of Institute of Control, Robotics and Systems 27, no. 2 (February 28, 2021): 168–75. http://dx.doi.org/10.5302/j.icros.2021.20.0163.

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15

Choy, S., Y. B. Bai, S. Zlatanova, A. Diakite, E. Rubinov, C. Marshall, P. Knight, et al. "AUSTRALIA-JAPAN QZSS EMERGENCY WARNING SERVICE TRIAL PROJECT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIV-3/W1-2020 (November 18, 2020): 21–28. http://dx.doi.org/10.5194/isprs-archives-xliv-3-w1-2020-21-2020.

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Abstract. This paper provides an overview and the results of the Australia-Japan 2020 Quasi Zenith Satellite System (QZSS) Emergency Warning System trial project. The project aimed to evaluate and demonstrate the feasibility of utilising the QZSS system to support emergency warning and response in Australia. The trial has focussed on bushfire and tsunami warnings with an emphasis on the message structure and standards for incorporation on the available signal bandwidth, and the spatial coverage extent of the messages. It also aimed to address the need for a space-based communication capability in Australia, which could potentially facilitate effective emergency warning system unconstrained by the limitations of terrestrial telecommunications.A newly dedicated MobileApp was developed to decode the warning message and visualise relevant information on a map. Two messages for bushfire and tsunami warnings were generated in Australia and sent to the QZSS ground station for satellite transmission. The developed application was tested in Victoria and New South Wales. The trial was successful in the sense that the emergency warning message could be received and decoded using the QZSS enabled receivers and the dedicated MobileApp. The field tests showed that the systems are capable of delivering the required information to users with the required timeliness and completeness. Several technical issues encountered during testing can be primarily attributed to the alpha state of the app, and the specific receiver used for testing. Neither of which are considered to be significant barriers to the on-going development of an operational satellite EWS system.

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Kitamura, Mitsunori, Yoichi Yasuoka, Taro Suzuki, Yoshiharu Amano, and Takumi Hashizume. "Path Planning for Autonomous Vehicles Using QZSS and Satellite Visibility Map." Journal of Robotics and Mechatronics 25, no. 2 (April 20, 2013): 400–407. http://dx.doi.org/10.20965/jrm.2013.p0400.

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This paper describes a path planning method that uses the Quasi-Zenith Satellites System(QZSS) and a satellite visibility map for autonomous vehicles. QZSS is a positioning system operated by Japan that has an effect similar to an increase in the number of GPS satellites. Therefore, QZSS can be used to improve the availability of GPS positioning. A satellite visibility map is a special map that simulates the number of visible satellites at all points on the map. The vehicle can use the satellite visibility map to determine the points that receive more satellite signals. The proposed method generates the artificial potential fields from the satellite visibility map and obstacle information around the vehicle, and it generates the path following the potential fields. Thereby, the vehicle can select the path that has more satellite signals, improving the availability of GPS fixed solutions. Hence, the vehicle can reduce the accumulated error by dead reckoning, and it can improve the safety of self-control. In this study, we evaluate the satellite visibility maps and the path planning method. The results show that the proposed method does improve the availability of GPS fixed solutions.

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17

Lee, Byung-Hyun, and Gyu-In Jee. "PERFORMANCE ANALYSIS OF DOPPLER AIDED GPS/QZSS PRECISE POSITIONING FOR LAND VEHICLES." Annual of Navigation 20, no. 1 (June 1, 2013): 85–96. http://dx.doi.org/10.2478/aon-2013-0007.

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ABSTRACT For ITS (Intelligent Transport Systems), especially for land vehicles, precise position is the prime information. GNSS is the most popular navigation system. Generally, ITS demands lane distinguishable positioning accuracy. However urban area is most environments of land vehicles and the signal blocks of satellite with low elevation angle, multipath error and etc. make unreliable positioning results. Especially, lack of number of visible satellites (fewer than 4 satellites) cannot provide positioning results. QZSS (Quasi-Zenith Satellite System) which operated by Japan has high interoperability. In addition, its elevation angle is very high in long time in Korea. It means QZSS signal can be received in urban area and it can be great advantage for land vehicles. The most positioning errors are occurred by multipath, cycle slip, and etc. For example, multipath error is unexpected momentary error. In order to reduce position error, smoothing technique in position domain is needed. In this paper, precise positioning for land vehicles was evaluated. First, by using QZSS, probability of navigation solution was enhanced. Second, the reliability is improved by smoothing positioning result using Doppler measurement. The analysis was performed by trajectory analysis using precise map data.

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18

Wu, Mingkui, Xiaohong Zhang, Wanke Liu, Renpan Wu, Renlan Zhang, Yuan Le, and Yuexia Wu. "Influencing Factors of GNSS Differential Inter-System Bias and Performance Assessment of Tightly Combined GPS, Galileo, and QZSS Relative Positioning for Short Baseline." Journal of Navigation 72, no. 04 (December 27, 2018): 965–86. http://dx.doi.org/10.1017/s0373463318001017.

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This paper first investigates the influencing factors of between-receiver Differential Inter-System Bias (DISB) between overlapping frequencies of the Global Positioning System (GPS), Galileo and the Quasi-Zenith Satellite System (QZSS). It was found that the receiver reboot and the type of observations may have an impact on DISBs. The impact of receiver firmware upgrades and the activation of anti-multipath filters are also investigated and some new results are presented. Then a performance evaluation is presented of tightly combined relative positioning for a short baseline with GPS/Galileo/QZSS L1-E1-L1/L5-E5a-L5 observations with the current constellations, in which the recently launched Galileo and QZSS satellites will also be included. It is demonstrated that when DISBs are a priori calibrated and corrected, the tightly combined model can deliver a much higher empirical ambiguity resolution success rate and positioning accuracy with respect to the classical loosely combined model, especially under environments where the observed satellites for each system are limited and only single-frequency observations are available. The ambiguity dilution of precision, bootstrapping success rate, and ratio values are analysed to illustrate the benefits of the tightly combined model as well.

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19

Ko, Kwang-Soob, and Chang-Mook Choi. "Performance Analysis of Integrated GNSS with GPS and QZSS." Journal of the Korea Institute of Information and Communication Engineering 20, no. 5 (May 31, 2016): 1031–39. http://dx.doi.org/10.6109/jkiice.2016.20.5.1031.

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20

Li, Xingxing, Yiting Zhu, Kai Zheng, Yongqiang Yuan, Gege Liu, and Yun Xiong. "Precise Orbit and Clock Products of Galileo, BDS and QZSS from MGEX Since 2018: Comparison and PPP Validation." Remote Sensing 12, no. 9 (April 30, 2020): 1415. http://dx.doi.org/10.3390/rs12091415.

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In recent years, the development of new constellations including Galileo, BeiDou Navigation Satellite System (BDS) and Quasi-Zenith Satellite System (QZSS) have undergone dramatic changes. Since January 2018, about 30 satellites of the new constellations have been launched and most of the new satellites have been included in the precise orbit and clock products provided by the Multi Global Navigation Satellite System (Multi-GNSS) Experiment (MGEX). Meanwhile, critical issues including antenna parameters, yaw-attitude models and solar radiation pressure models have been continuously refined for these new constellations and updated into precise MGEX orbit determination and precise clock estimation solutions. In this context, MGEX products since 2018 are herein assessed by orbit and clock comparisons among individual analysis centers (ACs), satellite laser ranging (SLR) validation and precise point positioning (PPP) solutions. Orbit comparisons showed 3D agreements of 3–5 cm for Galileo, 8–9 cm for BDS-2 inclined geosynchronous orbit (IGSO), 12–18 cm for BDS-2 medium earth orbit (MEO) satellites, 24 cm for BDS-3 MEO and 11–16 cm for QZSS IGSO satellites. SLR validations demonstrated an orbit accuracy of about 3–4 cm for Galileo and BDS-2 MEO, 5–6 cm for BDS-2 IGSO, 4–6 cm for BDS-3 MEO and 5–10 cm for QZSS IGSO satellites. Clock products from different ACs generally had a consistency of 0.1–0.3 ns for Galileo, 0.2–0.5 ns for BDS IGSO/MEO and 0.2–0.4 ns for QZSS satellites. The positioning errors of kinematic PPP in Galileo-only mode were about 17–19 mm in the north, 13–16 mm in the east and 74–81 mm in the up direction, respectively. As for BDS-only PPP, positioning accuracies of about 14, 14 and 49 mm could be achieved in kinematic mode with products from Wuhan University applied.

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NAKAJIMA, Kazuki, Tatsunori SADA, and Hisashi EMORI. "VERIFICATION OF ACCURACY CHANGE OF GPS AND QZSS POSITIONING FOCUSING ON THE NUMBER AND ELEVATION ANGLE OF QZSS." Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics) 74, no. 2 (2018): II_63—II_70. http://dx.doi.org/10.2208/jscejcei.74.ii_63.

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22

Tan, Bingfeng, Yunbin Yuan, Qingsong Ai, and Jiuping Zha. "Real-Time Multi-GNSS Precise Orbit Determination Based on the Hourly Updated Ultra-Rapid Orbit Prediction Method." Remote Sensing 14, no. 17 (September 5, 2022): 4412. http://dx.doi.org/10.3390/rs14174412.

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Offering real-time precise point positioning (PPP) services for global and large areas based on global navigation satellite systems (GNSS) has drawn more and more attention from institutions and companies. A precise and reliable satellite orbit is a core premise for multi-GNSS real-time services, especially for the GPS and GLONASS, which are undergoing modernization, whereas the Galileo, BDS and QZSS have just fulfilled the construction stage. In this contribution, a real-time precise orbit determination (POD) strategy for the five operational constellations based on the hourly updated ultrarapid orbit prediction method is presented. After combination of 72 h arc through three adjacent 24 h arc normal equations, the predicted orbits are finally generated (hourly updated). The POD results indicate that the mean one-dimensional (1-D) root mean square (RMS) values compared with the Deutsches GeoForschungsZentrum (GFZ) final multi-GNSS orbits are approximately 3.7 cm, 10.2 cm, 5.8 cm, 5.7 cm, 4.1 cm and 25.1 cm for GPS, BDS IGSOs, BDS MEOs, GLONASS, Galileo and QZSS NONE GEOs, respectively. The mean 1-D RMS values of the hourly updated ultrarapid orbit boundary overlapping comparison are approximately 1.6 cm, 6.9 cm, 3.2 cm, 2.7 cm, 1.8 cm and 22.2 cm for GPS, BDS IGSOs, BDS MEOs, GLONASS, Galileo and QZSS NONE GEOs, respectively. The satellite laser ranging (SLR) validation illuminates that the mean RMS values are approximately 4.53 cm and 4.73 cm for the four MEOs of BDS-3 and four BDS-2 satellites, respectively.

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23

Hobiger, Thomas, Yasuhiro Takahashi, Maho Nakamura, Tadahiro Gotoh, Shinichi Hama, Takashi Maruyama, Tsutomu Nagatsuma, et al. "Dissemination of UTC(NICT) by Means of QZSS." IEEE Transactions on Instrumentation and Measurement 62, no. 6 (June 2013): 1537–44. http://dx.doi.org/10.1109/tim.2012.2225920.

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24

Iwata, Toshiaki, Tomonari Suzuyama, Michito Imae, and Yuji Hashibe. "Remote Synchronization Experiments for Quasi-Senith Satellite System Using Current Geostationary Satellites." International Journal of Navigation and Observation 2010 (June 17, 2010): 1–10. http://dx.doi.org/10.1155/2010/604239.

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The remote synchronization system for the onboard crystal oscillator (RESSOX) realizes accurate synchronization between an atomic clock at a ground station and the QZSS onboard crystal oscillator, reduces overall cost and satellite power consumption, as well as onboard weight and volume, and is expected to have a longer lifetime than a system with onboard atomic clocks. Since a QZSS does not yet exist, we have been conducting synchronization experiments using geostationary earth orbit satellites (JCSAT-1B or Intelsat-4) to confirm that RESSOX is an excellent system for timing synchronization. JCSAT-1B, the elevation angle of which is 46.5 degrees at our institute, is little affected by tropospheric delay, whereas Intelsat-4, the elevation angle of which is 7.9 degrees, is significantly affected. The experimental setup and the results of uplink experiments and feedback experiments using mainly Intelsat-4 are presented. The results show that synchronization within 10 ns is realized.

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Jung, Yung-Jin. "A Study on the Legal System of Japanese Quasi-Zenith Satellite System." Korean Journal of Air & Space Law and Policy 36, no. 1 (March 31, 2021): 163–78. http://dx.doi.org/10.31691/kasl36.1.6.

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Krasuski, Kamil. "Utilization GPS/QZSS Data for Determination of User's Position." Pomiary Automatyka Robotyka 19, no. 2 (May 12, 2015): 71–75. http://dx.doi.org/10.14313/par_216/71.

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Odolinski, Robert, Peter J. G. Teunissen, and Dennis Odijk. "Combined BDS, Galileo, QZSS and GPS single-frequency RTK." GPS Solutions 19, no. 1 (April 27, 2014): 151–63. http://dx.doi.org/10.1007/s10291-014-0376-6.

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Wang, Wenzhe, Fengyu Chu, and Ming Yang. "Multi-GNSS Induced Performance Enhancements in Constrained Environments." E3S Web of Conferences 94 (2019): 01011. http://dx.doi.org/10.1051/e3sconf/20199401011.

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Nowadays, three global navigation satellite systems (GNSS), namely GPS, GLONASS and China’s BeiDou System (BDS), are fully-operational in the Asia-Pacific region. Furthermore, the European Galileo system and the Japanese Quasi Zenith Satellite System (QZSS), which is a regional navigation satellite system (RNSS), jointly provide 4 to 8 additional visible satellites in the region. Thus, it is expected that a combination of the above five systems will improve positioning performance as a result of enhanced satellite availability provided by multi-GNSS. In this research, we develop a method to combine GPS, GLONASS, BDS, Galileo, and QZSS pseudorange and carrier phase observations, and investigate positioning performance improvements brought by multi-GNSS. Experimental data were collected in Southern Taiwan to perform pseudorange-based, meter-level absolute (point) positioning as well as carrier phase-based, centimeter-level relative positioning. Test results indicate that (1) using multi-GNSS can effectively improve the accuracy of absolute (single point) and relative positioning, particularly in highly-masked, constrained environments, such as urban areas; (2) combining the five constellations can significantly shorten the Time-To-First-Fix (TTFF) for rapid ambiguity resolution required by Real-Time Kinematic (RTK) applications in constrained environments.

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ZHANG, Yun, Yongming LIU, Zhonghua HONG, Chunming FAN, and Akio YASUDA. "Evaluation of Positioning Performance using the GPS + QZSS in Shanghai." TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES 57, no. 1 (2014): 1–8. http://dx.doi.org/10.2322/tjsass.57.1.

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30

Kameda, Suguru, Akinori Taira, Yuji Miyake, Noriharu Suematsu, Tadashi Takagi, and Kazuo Tsubouchi. "Evaluation of Synchronized SS-CDMA for QZSS Safety Confirmation System." IEEE Transactions on Vehicular Technology 68, no. 5 (May 2019): 4846–56. http://dx.doi.org/10.1109/tvt.2019.2905530.

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31

Odijk, Dennis, Nandakumaran Nadarajah, Safoora Zaminpardaz, and Peter J. G. Teunissen. "GPS, Galileo, QZSS and IRNSS differential ISBs: estimation and application." GPS Solutions 21, no. 2 (April 16, 2016): 439–50. http://dx.doi.org/10.1007/s10291-016-0536-y.

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KAWASAKI, Yuhi, Masashi KAWAI, Takeyasu SAKAI, and Toshihiko NAKATANI. "The DGPS Positioning Accuracy by QZSS L1-SAIF Signal in Toyama." Journal of Japan Institute of Navigation 130 (2014): 99–104. http://dx.doi.org/10.9749/jin.130.99.

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Hauschild, André, Peter Steigenberger, and Carlos Rodriguez-Solano. "Signal, orbit and attitude analysis of Japan’s first QZSS satellite Michibiki." GPS Solutions 16, no. 1 (December 9, 2011): 127–33. http://dx.doi.org/10.1007/s10291-011-0245-5.

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34

Zhang, Qinghua, Yongxing Zhu, and Zhengsheng Chen. "An In-Depth Assessment of the New BDS-3 B1C and B2a Signals." Remote Sensing 13, no. 4 (February 21, 2021): 788. http://dx.doi.org/10.3390/rs13040788.

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An in-depth and comprehensive assessment of new observations from BDS-3 satellites is presented, with the main focus on the Carrier-to-Noise density ratio (C/N0), the quality of code and carrier phase observations for B1C and B2a signal. The signal characteristics of geosynchronous earth orbit (GEO), inclined geosynchronous satellite orbit (IGSO) and medium earth orbit (MEO) satellites of BDS-3 were grouped and compared, respectively. The evaluation results of the new B1C and B2a signals of BDS-3 were compared with the previously B1I/B2I/B3I signals and the interoperable signals of GPS, Galileo and quasi-zenith satellite system (QZSS) were compared simultaneously. As expected, the results clearly show that B1C and B2a have better signal strength and higher accuracy, including code and carrier phase observations. The C/N0 of the B2a signal is about 3 dB higher than other signals. One exception is the code observation accuracy of B3I, which value is less than 0.15 m. The carrier precision of B1C and B2a is better than that of B1I/B2I/B3I. Despite difference-in-difference (DD) observation quantity or zero-base line evaluation is adopted, while B1C is about 0.3 mm higher carrier precision than B2a. The BDS-3 MEO satellite and GPS, Galileo, and QZSS satellites have the same level of signal strength, code and phase observation accuracy at the interoperable frequency, namely 1575.42 MHz and 1176.45 MHz which are very suitable for the co-position application.

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YAMADA, Makoto, Tatsunori SADA, and Hisashi EMORI. "VERIFICATION OF KINEMATIC POSITIONING ACCURACY IN CENTIMETER LEVEL AUGMENTATION SERVICE BY QZSS." Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics) 78, no. 2 (2022): I_33—I_42. http://dx.doi.org/10.2208/jscejcei.78.2_i_33.

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36

KUBO, Nobuaki, Hideki YAMADA, and Tomoji TAKASU. "Initial Assessment of Medium-Baseline Single-Epoch RTK Using GPS/BeiDou/QZSS." IEICE Transactions on Communications E97.B, no. 6 (2014): 1195–204. http://dx.doi.org/10.1587/transcom.e97.b.1195.

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37

Zhang, Yize, Nobuaki Kubo, Junping Chen, Feng-Yu Chu, Hu Wang, and Jiexian Wang. "Contribution of QZSS with four satellites to multi-GNSS long baseline RTK." Journal of Spatial Science 65, no. 1 (September 13, 2019): 41–60. http://dx.doi.org/10.1080/14498596.2019.1646676.

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38

Khodabandeh, A., and P. J. G. Teunissen. "Array-based satellite phase bias sensing: theory and GPS/BeiDou/QZSS results." Measurement Science and Technology 25, no. 9 (July 22, 2014): 095801. http://dx.doi.org/10.1088/0957-0233/25/9/095801.

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39

Zhao, Qile, Guo Chen, Jing Guo, Jingnan Liu, and Xianglin Liu. "An a priori solar radiation pressure model for the QZSS Michibiki satellite." Journal of Geodesy 92, no. 2 (July 14, 2017): 109–21. http://dx.doi.org/10.1007/s00190-017-1048-4.

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40

Li, Xingxing, Yongqiang Yuan, Jiande Huang, Yiting Zhu, Jiaqi Wu, Yun Xiong, Xin Li, and Keke Zhang. "Galileo and QZSS precise orbit and clock determination using new satellite metadata." Journal of Geodesy 93, no. 8 (February 2, 2019): 1123–36. http://dx.doi.org/10.1007/s00190-019-01230-4.

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41

Mangaraj, Mrutyunjaya, Jogeswara Sabat, Ajit Kumar Barisal, Anil Kumar Patra, and Ashok Kumar Chahattaray. "Performance Evaluation of BB-QZSI-Based DSTATCOMUnder Dynamic Load Condition." Power Electronics and Drives 7, no. 1 (January 1, 2022): 43–55. http://dx.doi.org/10.2478/pead-2022-0004.

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Abstract This paper presents the shunt compensation performance of quasi-Z-source inverter (QZSI) and back to back connected QZSIs (BB-QZSI) to address the power quality (PQ) issues in the three-phase three-wire power utility network (PUN). Generally, these PQ issues are poor voltage regulation, low power factor (PF), source current distortion, unbalanced voltage, etc. The proposed BBQZSI-based distribution static compensator (DSTATCOM) consists of two QZSIs with a common dc-link capacitor. Because the QZSI could achieve buck/boost conversion as well as DC to AC inversion in a single-stage and the back to back configuration decreases the system down time cost (if a fault occurs in one QZSI the other can continue the shunt compensation). Particularly, icos ϕ control algorithmcontrol algorithm is implemented to generate proper switching pulses for the switches of DSTATCOM. The effectiveness of the BB-QZSI is verified through simulation studies over QZSI using MATLAB/Simulink software satisfying the recommended grid code.

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42

Wang, Qisheng, Shuanggen Jin, and Xianfeng Ye. "A Novel Method to Estimate Multi-GNSS Differential Code Bias without Using Ionospheric Function Model and Global Ionosphere Map." Remote Sensing 14, no. 9 (April 21, 2022): 2002. http://dx.doi.org/10.3390/rs14092002.

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Global navigation satellite system (GNSS) differential code bias (DCB) is one of main errors in ionospheric modeling and applications. Accurate estimation of multiple types of GNSS DCBs is important for GNSS positioning, navigation, and timing, as well as ionospheric modeling. In this study, a novel method of multi-GNSS DCB estimation is proposed without using an ionospheric function model and global ionosphere map (GIM), namely independent GNSS DCB estimation (IGDE). Firstly, ionospheric observations are extracted based on the geometry-free combination of dual-frequency multi-GNSS code observations. Secondly, the VTEC of the station represented by the weighted mean VTEC value of the ionospheric pierce points (IPPs) at each epoch is estimated as a parameter together with the combined receiver and satellite DCBs (RSDCBs). Last, the estimated RSDCBs are used as new observations, whose weight is calculated from estimated covariances, and thus the satellite and receiver DCBs of multi-GNSS are estimated. Nineteen types of multi-GNSS satellite DCBs are estimated based on 200-day observations from more than 300 multi-GNSS experiment (MGEX) stations, and the performance of the proposed method is evaluated by comparing with MGEX products. The results show that the mean RMS value is 0.12, 0.23, 0.21, 0.13, and 0.11 ns for GPS, GLONASS, BDS, Galileo, and QZSS DCBs, respectively, with respect to MGEX products, and the stability of estimated GPS, GLONASS, BDS, Galileo, and QZSS DCBs is 0.07, 0.06, 0.13, 0.11, and 0.11 ns, respectively. The proposed method shows good performance of multi-GNSS DCB estimation in low-solar-activity periods.

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Cui, Haomeng, and Shoujian Zhang. "Satellite Availability and Service Performance Evaluation for Next-Generation GNSS, RNSS and LEO Augmentation Constellation." Remote Sensing 13, no. 18 (September 16, 2021): 3698. http://dx.doi.org/10.3390/rs13183698.

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Positioning accuracy is affected by the combined effect of user range errors and the geometric distribution of satellites. Dilution of precision (DOP) is defined as the geometric strength of visible satellites. DOP is calculated based on the satellite broadcast or precise ephemerides. However, because the modernization program of next-generation navigation satellite systems is still under construction, there is a lack of real ephemerides to assess the performance of next-generation constellations. Without requiring real ephemerides, we describe a method to estimate satellite visibility and DOP. The improvement of four next-generation Global Navigation Satellite Systems (four-GNSS-NG), compared to the navigation constellations that are currently in operation (four-GNSS), is statistically analyzed. The augmentation of the full constellation the Quasi-Zenith Satellite System (7-QZSS) and the Navigation with Indian Constellation (11-NavIC) for regional users and the low Earth orbit (LEO) constellation enhancing four-GNSS performance are also analyzed based on this method. The results indicate that the average number visible satellites of the four-GNSS-NG will reach 44.86, and the average geometry DOP (GDOP) will be 1.19, which is an improvement of 17.3% and 7.8%, respectively. With the augmentation of the 120-satellite mixed-orbit LEO constellation, the multi-GNSS visible satellites will increase by 5 to 8 at all latitudes, while the GDOP will be reduced by 6.2% on average. Adding 7-QZSS and 11-NavIC to the four-GNSS-NG, 37.51 to 71.58 satellites are available on global scales. The average position DOP (PDOP), horizontal DOP (HDOP), vertical DOP (VDOP), and time DOP (TDOP) are reduced to 0.82, 0.46, 0.67 and 0.44, respectively.

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44

Thoelert, Steffen. "Latest GNSS signal in space developments – GPS, QZSS & the new Beidou 3 under examination." E3S Web of Conferences 94 (2019): 03016. http://dx.doi.org/10.1051/e3sconf/20199403016.

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Nowadays one can use four global navigation satellite systems (GNSS). Two of them are complete constellations (GPS, Glonass) and two (Beidou, Galileo) are already usable and will be finish in the near future. Additionally satellite based augmentation systems (SBAS) like WAAS, EGNOS, GAGAN or QZSS complement the GNSS service. However, within all systems one can observe changes, modifications, and updates every year. This can be related to satellite renewables leading to signal property changes. Especially, for safety critical applications using GNSS, like advanced receiver autonomous integrity monitoring (ARAIM) or ground-based augmentation systems (GBAS) the new or changed signal properties are of high interest. With the help of detailed information about the signal deformation and the received signal power it is possible to calculate realistic error bounds and consequently realistic protection level for these kinds of safety critical applications. This paper presents an overview of the findings according new signals or signal configurations of GPS, Beidou and QZSS of the last two years. After a brief introduction of the measurement facility the paper will introduce basic analysis about the quality of the signal shape in spectral and modulation domain. Using our precise calibrated measurement facility, we will also present an analysis of the transmitted satellite signal power including estimates about the power sharing among individual signal components within each band. Considering the measured power in relation to the boresight angle of the satellite one can derive a cut through the antenna pattern of the satellite and can assess the antenna symmetry properties. Examples for different satellites will be presented. Finally, we will end with a conclusion regarding the considered signal developments and its impact on GNSS users.

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45

WAKABAYASHI, Yaka, Satoshi KOGURE, Jiro YAMASHITA, Hiroaki TATESHITA, and Motoyuki MIYOSHI. "Evaluation of Availability Improvement by Adding QZSS on Multi Locations in Various Conditions." TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN 10, ists28 (2012): Pj_17—Pj_22. http://dx.doi.org/10.2322/tastj.10.pj_17.

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46

Li, Zengke, and Fu Chen. "Improving availability and accuracy of GPS/BDS positioning using QZSS for single receiver." Acta Geodaetica et Geophysica 52, no. 1 (March 14, 2016): 95–109. http://dx.doi.org/10.1007/s40328-016-0167-3.

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47

Hong, Ju, Rui Tu, Rui Zhang, Lihong Fan, Pengfei Zhang, and Junqiang Han. "Contribution analysis of QZSS to single-frequency PPP of GPS/BDS/GLONASS/Galileo." Advances in Space Research 65, no. 7 (April 2020): 1803–17. http://dx.doi.org/10.1016/j.asr.2020.01.003.

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48

Iwata, Toshiaki, Michito Imae, Tomonari Suzuyama, Yuji Hashibe, Satoshi Fukushima, Akira Iwasaki, Kenji Kokubu, Fabrizio Tappero, and Andrew G. Dempster. "Remote Synchronization Simulation of Onboard Crystal Oscillator for QZSS Using L1/L2/L5 Signals for Error Adjustment." International Journal of Navigation and Observation 2008 (January 3, 2008): 1–7. http://dx.doi.org/10.1155/2008/462062.

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A new error adjustment method for remote synchronization of the onboard crystal oscillator for the quasi-zenith satellite system (QZSS) using three different frequency positioning signals (L1/L2/L5) is proposed. The error adjustment method that uses L1/L2 positioning signals was demonstrated in the past. In both methods, the frequency-dependent part and the frequency-independent part were considered separately, and the total time information delay was estimated. By adopting L1/L2/L5, synchronization was improved by approximately 15% compared with that using L1/L2 and approximately 10% compared with that using L1/L5 and a synchronization error of less than 0.77 nanosecond was realized.

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49

Ye, Fei, Yunbin Yuan, Bingfeng Tan, Zhiguo Deng, and Jikun Ou. "The Preliminary Results for Five-System Ultra-Rapid Precise Orbit Determination of the One-Step Method Based on the Double-Difference Observation Model." Remote Sensing 11, no. 1 (December 29, 2018): 46. http://dx.doi.org/10.3390/rs11010046.

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The predicted parts of ultra-rapid orbits are important for (near) real-time Global Navigation Satellite System (GNSS) precise applications; and there is little research on GPS/GLONASS/BDS/Galileo/QZSS five-system ultra-rapid precise orbit determination; based on the one-step method and double-difference observation model. However; the successful development of a software platform for solving five-system ultra-rapid orbits is the basis of determining and analyzing these orbits. Besides this; the different observation models and processing strategies facilitate to validate the reliability of the various ultra-rapid orbits. In this contribution; this paper derives the double-difference observation model of five-system ultra-rapid precise orbit determination; based on a one-step method; and embeds this method and model into Bernese v5.2; thereby forming a new prototype software platform. For validation purposes; 31 days of real tracking data; collected from 130 globally-distributed International GNSS Service (IGS) multi-GNSS Experiment (MGEX) stations; are used to determine a five-system ultra-rapid precise orbit. The performance of the software platform is evaluated by analysis of the orbit discontinuities at day boundaries and by comparing the consistency with the MGEX orbits from the Deutsches GeoForschungsZentrum (GFZ); between the results of this new prototype software platform and the ultra-rapid orbit provided by the International GNSS Monitoring and Assessment System (iGMAS) analysis center (AC) at the Institute of Geodesy and Geophysics (IGG). The test results show that the average standard deviations of orbit discontinuities in the three-dimension direction are 0.022; 0.031; 0.139; 0.064; 0.028; and 0.465 m for GPS; GLONASS; BDS Inclined Geosynchronous Orbit (IGSO); BDS Mid-Earth Orbit (MEO); Galileo; and QZSS satellites; respectively. In addition; the preliminary results of the new prototype software platform show that the consistency of this platform has been significantly improved compared to the software package of the IGGAC.

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SAKAI, Koki, Tatsunori SADA, and Hisashi EMORI. "STUDY ON IMPROVEMENT EFFECT OF VERTICAL ACCURACY OF GPS CARRIER PHASE POSITIONING USING QZSS." Journal of Japan Society of Civil Engineers, Ser. F3 (Civil Engineering Informatics) 73, no. 2 (2017): I_155—I_163. http://dx.doi.org/10.2208/jscejcei.73.i_155.

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