Готові списки джерел за темами / Satellite clock

Добірка наукової літератури з теми "Satellite clock"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Satellite clock"

1

Wang, Hu, Pengyuan Li, Jiexian Wang, Hongyang Ma, Yangfei Hou, and Yingying Ren. "Analysis of BDS-3 Real-Time Satellite Clock Offset Estimated in Global and Asia-Pacific and the Corresponding PPP Performances." Remote Sensing 14, no. 24 (December 7, 2022): 6206. http://dx.doi.org/10.3390/rs14246206.

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Анотація:
The quality of satellite clock offset affects the performances of positioning, navigation and timing services, and thus it is essential to the Global Navigation Satellite System (GNSS). This research focuses on the estimation of BeiDou Navigation Satellite System (BDS) real-time precise satellite clock offset by using GNSS stations located in the Global and Asia-Pacific region based on the mixed-difference model. The precision of the estimated BDS clock corrections is then analyzed with the classification of the orbit types, satellite generations, and atomic clock types. The results show that the precision of the BDS clock offset estimated in the Asia-Pacific for Geosynchronous Earth Orbit (GEO), Inclined Geosynchronous Satellite Orbit (IGSO) and Medium Earth Orbit (MEO) satellites are 0.204 ns, 0.077 ns and 0.085 ns, respectively, as compared to those of clock offsets estimated in globally distributed stations. The average precision of the BDS-3 satellites clock offset estimated in global region is 0.074 ns, which is much better than the 0.130 ns of BDS-2. Furthermore, analyzing the characteristics of the corresponding atomic clocks can explain the performance of the estimated satellite clock offset, and the stability and accuracy of various parameters of the Passive Hydrogen Maser (PHM) atomic clocks are better than those of Rubidium (Rb) atomic clocks. In the positioning domain, the real-time clocks estimated in the global/Asia-Pacific have been applied to BDS kinematic Precise Point Positioning (PPP) in different regions. The Root Mean Square (RMS) of positioning results in global real-time kinematic PPP is within 4 cm in the horizontal direction and about 6 cm in the vertical direction. Hence, the BDS real-time clock offset can supply the centimeter-level positioning demand around the world.
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2

Gu, Shengfeng, Feiyu Mao, Xiaopeng Gong, Yidong Lou, Xueyong Xu, and Ye Zhou. "Evaluation of BDS-2 and BDS-3 Satellite Atomic Clock Products and Their Effects on Positioning." Remote Sensing 13, no. 24 (December 11, 2021): 5041. http://dx.doi.org/10.3390/rs13245041.

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Анотація:
The BeiDou Navigation Satellite System (BDS) has completed third phase construction and currently provides global services, with a mixed constellation of BDS-2 and BDS-3. The newly launched BDS-3 satellites are equipped with rubidium and passive hydrogen maser (PHM) atomic clocks. The performance of atomic clocks is one of the cores of satellite navigation system, which will affect the performance of positioning, navigation and timing (PNT). In this paper, we systematically analyze the characteristics of BDS-2 and BDS-3 atomic clocks, based on more than one year of precise satellite clock products and broadcast ephemeris. Firstly, the results of overlapping Allan variations demonstrate that BDS-3 Rb and PHM clocks improve better in stability than BDS-2 Rb clock and are comparable to GPS IIF Rb and Galileo PHM clocks. Accordingly, the STDs of BDS-3 broadcast satellite clock are better than GPS and BDS-2, which are at the same level with that of Galileo. Secondly, the inter-system bias (ISB) between BDS-2 and BDS-3 is analyzed by satellite clock datum comparison and precise point positioning (PPP). Surprisingly, the discrepancy between BDS-2 and BDS-3 satellite clock datum has a great difference between products that could reach up to about 10 ns for WHU satellite clock products and broadcast ephemeris. Moreover, the ISBs between BDS-2 and BDS-3 satellite clocks are quite stable over one-year periods. Thirdly, due to the improved stability of BDS-3 atomic clock, the 68% positioning accuracy is better than 0.65 m at 10 min for BDS-3 PPP, based on broadcast ephemeris. Besides, the non-negligible bias between BDS-2 and BDS-3 will greatly affect the BDS precise data processing. The accuracy of positioning is greatly improved when considering the ISB.
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3

Geng, Tao, Rui Jiang, Yifei Lv, and Xin Xie. "Analysis of BDS-3 Onboard Clocks Based on GFZ Precise Clock Products." Remote Sensing 14, no. 6 (March 13, 2022): 1389. http://dx.doi.org/10.3390/rs14061389.

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Анотація:
The characteristics and performance of satellite clocks are important to the positioning, navigation, and timing (PNT) services of Global Navigation Satellite System (GNSS) users. Although China’s BeiDou-3 Navigation Satellite System (BDS-3) has been fully operational for more than one year, there is still a lack of comprehensive research on the onboard clocks of the entire BDS-3 constellation. In this study, the precise clock products of GeoForschungsZentrum (GFZ) from day-of-year (DOY) 1, 2021 to DOY 300, 2021 were used to analyze the characteristics and performance of BDS-3 onboard clocks from the following aspects: clock bias, frequency, drift rate, fitting residuals, periodicity, and frequency stability. Compared with BDS-2, the clock quality of BDS-3 satellites has been greatly improved, but there are still jumps in the clock offsets and frequency series of BDS-3 clocks. The drift rate of BDS-3 clocks varies within the range between −2×10−18 and 2×10−18 s/s2. The daily model fitting residuals of passive hydrogen masers (PHM) on BDS-3 medium Earth orbit (MEO), inclined geosynchronous orbit (IGSO), and geostationary (GEO) satellites are 0.15, 0.28, and 0.46 ns, respectively. The overlapping Allan deviation (OADEV) of BDS-3 MEO clocks is 4.0 × 10−14 s/s at a time interval of 1000 s. The PHMs on BDS-3 MEO satellites exhibit fewer periodic signals than those of Rb clocks. In addition, the precise clock offsets of the BDS-3 PHMs carried on the MEO, IGSO, and GEO satellites show different periodicities, which are similar to those of the corresponding types of BDS-2 satellites.
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4

Kudrys, Jacek, Dominik Prochniewicz, Fang Zhang, Mateusz Jakubiak, and Kamil Maciuk. "Identification of BDS Satellite Clock Periodic Signals Based on Lomb-Scargle Power Spectrum and Continuous Wavelet Transform." Energies 14, no. 21 (November 1, 2021): 7155. http://dx.doi.org/10.3390/en14217155.

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Анотація:
Onboard satellite clocks are the basis of Global Navigation Satellite Systems (GNSS) operation, and their revolution periods are at the level of 2 per day (about 12 h) in the case of the Medium Earth Orbit (MEO) satellites. In this work, the authors analysed the entire BeiDou Navigation Satellite System (BDS) space segment (BDS-2 and BDS-3) in terms of the occurrence of periodic, repetitive signals in the clock products, and checked if they coincide with the orbital periods or their multiples. The Lomb-Scargle (L-S) power spectrum was used as a tool to determine the periods present in the BDS clock products, allowing for analyses based on incomplete input data; in this case, the incomplete data were the phase data with jumps and outliers removed. In addition, continuous wavelet transform (CWT) was used to produce a time−frequency representation showing the more complex behaviour of the satellite clock products. As shown in the case of geostationary and geosynchronous inclined orbit satellites, the main period was 23.935 h, while for the Medium Earth Orbit it was 12.887 h, with the BDS satellite orbital period being 12 h 53 m (12.883 h). Some effects connected with reference clock swapping are also visible in the power spectrum. The conducted analyses showed that the BDS-2 satellite clocks have much higher noise than the BDS-3 satellite clocks, meaning that the number of designated periods is greater, but their reliability is significantly lower. BDS-3 satellites have only been in operation for a very short time, thus this is the first analysis to include this type of data. Moreover, such a wide and complex analysis has not been carried out to date.
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5

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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Анотація:
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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6

Lv, Yifei, Tao Geng, Qile Zhao, and Jingnan Liu. "Characteristics of BeiDou-3 Experimental Satellite Clocks." Remote Sensing 10, no. 11 (November 22, 2018): 1847. http://dx.doi.org/10.3390/rs10111847.

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Анотація:
The characteristics of the improved Atomic Frequency Standard (AFS) operated on the latest BeiDou-3 experimental satellites are analyzed from day-of-year (DOY) 254 to 281, of the year 2017, considering the following three aspects: stability, periodicity, and prediction precision. The two-step method of Precise Orbit Determination (POD) is used to obtain the precise clock offsets. We presented the stability of such new clocks and studied the influence of the uneven distribution of the ground stations on the stability performance of the clock. The results show that the orbit influence on the Medium Earth Orbit (MEO) clock offsets is the largest of three satellite types, especially from 3 × 10 3 s to 8.64 × 10 4 s. Considering this orbit influence, the analysis shows that the Passive Hydrogen Maser (PHM) clock carried on C32 is approximately 2.6 × 10 − 14 at an interval of 10 4 , and has the best stability for any averaging intervals among the BeiDou satellite clocks, which currently achieves a level comparable to that of the PHM clock of Galileo, and the rubidium (Rb) clocks of Global Positioning System (GPS) Block IIF. The stability of the improved Rb AFS on BeiDou-3 is also superior to that of BeiDou-2 from 3 × 10 2 s to 3 × 10 3 s, and comparable to that of Rb AFS on the Galileo. Moreover, the periodicity of the PHM clock and the improved Rb clock are presented. For the PHM clock, the amplitudes are obviously reduced, while the new Rb clocks did not show a visible improvement, which will need further analysis in the future. As expected, the precision of the short-term clock prediction is improved because of the better characteristics of AFS. The Root Mean Square (RMS) of 1-h clock prediction is less than 0.16 ns.
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7

Dai, Xiaolei, Yidong Lou, Zhiqiang Dai, Caibo Hu, Yaquan Peng, Jing Qiao, and Chuang Shi. "Precise Orbit Determination for GNSS Maneuvering Satellite with the Constraint of a Predicted Clock." Remote Sensing 11, no. 16 (August 20, 2019): 1949. http://dx.doi.org/10.3390/rs11161949.

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Анотація:
Precise orbit products are essential and a prerequisite for global navigation satellite system (GNSS) applications, which, however, are unavailable or unusable when satellites are undertaking maneuvers. We propose a clock-constrained reverse precise point positioning (RPPP) method to generate the rather precise orbits for GNSS maneuvering satellites. In this method, the precise clock estimates generated by the dynamic precise orbit determination (POD) processing before maneuvering are modeled and predicted to the maneuvering periods and they constrain the RPPP POD during maneuvering. The prediction model is developed according to different clock types, of which the 2-h prediction error is 0.31 ns and 1.07 ns for global positioning system (GPS) Rubidium (Rb) and Cesium (Cs) clocks, and 0.45 ns and 0.60 ns for the Beidou navigation satellite system (BDS) geostationary orbit (GEO) and inclined geosynchronous orbit (IGSO)/Median Earth orbit (MEO) satellite clocks, respectively. The performance of this proposed method is first evaluated using the normal observations without maneuvers. Experiment results show that, without clock-constraint, the average root mean square (RMS) of RPPP orbit solutions in the radial, cross-track and along-track directions is 69.3 cm, 5.4 cm and 5.7 cm for GPS satellites and 153.9 cm, 12.8 cm and 10.0 cm for BDS satellites. When the constraint of predicted satellite clocks is introduced, the average RMS is dramatically reduced in the radial direction by a factor of 7–11, with the value of 9.7 cm and 13.4 cm for GPS and BDS satellites. At last, the proposed method is further tested on the actual GPS and BDS maneuver events. The clock-constrained RPPP POD solution is compared to the forward and backward integration orbits of the dynamic POD solution. The resulting orbit differences are less than 20 cm in all three directions for GPS satellite, and less than 30 cm in the radial and cross-track directions and up to 100 cm in the along-track direction for BDS satellites. From the orbit differences, the maneuver start and end time is detected, which reveals that the maneuver duration of GPS satellites is less than 2 min, and the maneuver events last from 22.5 min to 107 min for different BDS satellites.
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8

Yang, Zhixin, Hui Liu, Chuang Qian, Bao Shu, Linjie Zhang, Xintong Xu, Yi Zhang, and Yidong Lou. "Real-Time Estimation of Low Earth Orbit (LEO) Satellite Clock Based on Ground Tracking Stations." Remote Sensing 12, no. 12 (June 25, 2020): 2050. http://dx.doi.org/10.3390/rs12122050.

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Анотація:
The rapid movement of low Earth orbit (LEO) satellite can improve geometric diversity, which contributes to the rapid convergence of Global Navigation Satellite System (GNSS) precise point positioning (PPP). However, the LEO onboard receiver clock cannot be used directly by PPP users as the LEO satellite clock because the LEO onboard receiver clock and LEO satellite clock absorb different code delays when receiving and transmitting signals. In this study, a real-time estimation approach for the LEO satellite clock based on ground tracking stations was proposed for the first time. The feasibility for the rapid convergence of the LEO satellite clock was analyzed using the satellite time dilution of precision (TDOP) that one satellite is relative to multiple ground tracking stations. The LEO constellation of 168 satellites and observations for 15 ground tracking stations were simulated to verify the proposed method. The experiment results showed that the average convergence time was 31.21 min for the Global Positioning System (GPS) satellite clock, whereas the value for the LEO satellite clock was only 2.86 min. The average root mean square (RMS) and standard deviation (STD) values after convergence were 0.71 and 0.39 ns for the LEO satellite clock, whereas the values were 0.31 and 0.13 ns for the GPS satellite clock. The average weekly satellite TDOP for the LEO satellite was much smaller than that for the GPS satellite. The average satellite TDOPs for all LEO and GPS satellites were 19.13 and 1294.70, respectively. However, the average delta TDOPs caused by satellite motion for all LEO and GPS satellites were both 0.10. Therefore, the rapid convergence of the LEO satellite clock resulted from the better geometric distribution of the LEO satellite relative to ground stations. Despite errors and the convergence time of the LEO satellite clock, the convergence time and positioning accuracy for LEO-augmented GPS and BeiDou Navigation Satellite System (BDS) PPP with the real-time estimated LEO satellite clock can still reach 10.63 min, 1.94 cm, 1.44 cm, and 4.18 cm in the east, north, and up components, respectively. The improvements caused by LEO satellite for GPS/BDS PPP were 59%, 30%, 31%, and 33%, respectively.
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9

Meng, Fan Qin, Xu Hai Yang, Ji Kun Ou, and Pei Wei. "Method of Determining Satellite Clock Error by Using Observation Data of Satellite-Ground and Inter-Satellite." Advanced Materials Research 718-720 (July 2013): 474–79. http://dx.doi.org/10.4028/www.scientific.net/amr.718-720.474.

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Анотація:
We have done some simulate analysis on GPS data in this paper. The main research is method of determining satellite clock error by usining observation data of satellite-ground and inter-satellite under the condition of regional station arrangement. The research method is as follows: when the satellite in the visible area of regional observation network, we can get satellite clock error directly by satellite-ground time comparison, and predict the satellite clock error in invisible area. When the satellite in the invisible area of regional observation network, if this satellite can establish inter-satellite links with other satellites in the visible area, then the satellite clock error can be determined by time comparison of satellite-ground and inter-satellite; If there is no inter-satellite link between this satellite and other satellites in the visible area, then we can only predict the satellite clock error by given data. The simulation conditions of this paper are as follows: the system error of satellite-ground is 0.5 ns, the random error is 0.5 ns; the system error of inter-satellite is 1 ns, the random error is 0.5 ns. In this case, we can obtain the satellite clock error of PRN02 in an orbital period by method of this paper, and the accuracy is about 1.3 ns.
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10

Yuan, Zhimin, Changsheng Cai, Lin Pan, and Cuilin Kuang. "An Improved Multi-Satellite Method for Evaluating Real-Time BDS Satellite Clock Offset Products." Remote Sensing 12, no. 21 (November 5, 2020): 3638. http://dx.doi.org/10.3390/rs12213638.

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Анотація:
Two methods are widely used for evaluating the precision of satellite clock products, namely the single-satellite method (SSM) and the multi-satellite method (MSM). In the satellite clock product evaluation, an important issue is how to eliminate the timescale difference. The SSM selects a reference satellite to eliminate the timescale difference by between-satellite differencing, but its evaluation results are susceptible to the gross errors in the referenced satellite clock offsets. In the MSM, the timescale difference is first estimated and then removed. Unlike the GPS, the BeiDou Navigation Satellite System (BDS) consists of three types of satellites, namely geosynchronous earth orbit (GEO), inclined geosynchronous orbit (IGSO), and medium earth orbit (MEO) satellites. The three types of satellites have uneven orbital accuracy. In the generation of satellite clock products, the orbital errors are partly assimilated into the clock offsets. If neglecting the orbital accuracy difference of the three types of BeiDou satellites, the MSM will obtain biased estimates of the timescale difference and finally affect the clock product evaluation. In this study, an improved multi-satellite method (IMSM) is proposed for evaluating the real-time BDS clock products by removing the assimilated orbital errors of the three types of BDS satellites when estimating the timescale difference. Three real-time BDS clock products disseminated by three different International GNSS Service (IGS) analysis centers, namely CLK16, CLK20, and CLK93, over a period of two months are used to validate this method. The results indicate that the assimilated orbital errors have a significant impact on the estimation of the timescale difference. Subsequently, the IMSM is compared with the SSM in which the referenced satellite is rigorously chosen, and their RMS difference is only 0.08 ns, which suggests that the evaluation results obtained by the IMSM are accurate. Compared with the traditional MSM, the IMSM improves the RMS by 0.16, 0.11, and 0.07 ns for CLK16, CLK20, and CLK93, respectively. Finally, three real-time BDS clock products are evaluated using the proposed method, and results reveal a significant precision difference among them.
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Дисертації з теми "Satellite clock"

1

Bhattarai, S. "Satellite clock time offset prediction in global navigation satellite systems." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1464288/.

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Анотація:
In an operational sense, satellite clock time offset prediction (SCTOP) is a fundamental requirement in global navigation satellite systems (GNSS) tech- nology. SCTOP uncertainty is a significant component of the uncertainty budget of the basic GNSS pseudorange measurements used in standard (i.e not high-precision), single-receiver applications. In real-time, this prediction uncertainty contributes directly to GNSS-based positioning, navigation and timing (PNT) uncertainty. In short, GNSS performance in intrinsically linked to satellite clock predictability. Now, satellite clock predictability is affected by two factors: (i) the clock itself (i.e. the oscillator, the frequency standard etc.) and (ii) the prediction algorithm. This research focuses on aspects of the latter. Using satellite clock data—spanning across several years, corresponding to multiple systems (GPS and GLONASS) and derived from real measurements— this thesis first presents the results of a detailed study into the characteristics of GNSS satellite clocks. This leads onto the development of strategies for modelling and estimating the time-offset of those clocks from system time better, with the final aim of predicting those offsets better. The satellite clock prediction scheme of the International GNSS Service (IGS) is analysed, and the results of this prediction scheme are used to evaluate the performance of new methods developed herein. The research presented in this thesis makes a contribution to knowledge in each of the areas of characterisation, modelling and prediction of GNSS satellite clocks. Regarding characterisation of GNSS satellite clocks, the space-borne clocks of GPS and GLONASS are studied. In terms of frequency stability—and thus predictability—it is generally the case that the GPS clocks out-perform GLONASS clocks at prediction lengths ranging from several minutes up to one day ahead. There are three features in the GPS clocks—linear frequency drift, periodic signals and and complex underlying noise processes—that are not observable in the GLONASS clocks. The standard clock model does not capture these features. This study shows that better prediction accuracy can be obtained by an extension to the standard clock model. The results of the characterisation and modelling study are combined in a Kalman filter framework, set up to output satellite clock predictions at a range of prediction intervals. In this part of the study, only GPS satellite clocks are considered. In most, but not all cases, the developed prediction method out- performs the IGS prediction scheme, by between 10% to 30%. The magnitude of the improvement is mainly dependent upon clock type.
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2

Thongtan, Thayathip. "Simultaneous single epoch satellite clock modelling in global navigation satellite systems." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/16782/.

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Анотація:
In order to obtain high quality positions from navigation satellites, range errors have to be identified and either modelled or estimated. This thesis focuses on satellite clock errors, which are needed to be known because satellite clocks are not perfectly synchronised with navigation system time. A new approach, invented at UCL, for the simultaneous estimation, in a single epoch, of all satellite clock offsets within a Global Navigation Satellite System (GNSS) from range data collected at a large number of globally distributed ground stations is presented. The method was originally tested using only data from a limited number of GPS satellites and ground stations. In this work a total of 50 globally distributed stations and the whole GPS constellation are used in order to investigate more fully the capabilities of the method, in terms of both accuracy and reliability. A number of different estimation models have been tested. These include those with different weighting schemes, those with and without tropospheric bias parameters and those that include assumptions regarding prior knowledge of satellite orbits. In all cases conclusions have been drawn based on formal error propagation theory. Accuracy has been assessed largely through the sizes of the predicted satellite clock standard deviations and, in case of simultaneously estimating satellite positions, their error ellipsoids. Both internal and external reliability have been assessed as there are important contributions to integrity, something that is essential for many practical applications. It has been found that the accuracy and reliability of satellite clock offsets are functions of the number of known ground station clocks and distance from them, quality of orbits and quality of range measurement. Also the introduction of tropospheric zenith delay parameters into the model reduced both accuracy and reliability by amounts depending on satellite elevation angles.
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3

Tappero, Fabrizio Surveying &amp Spatial Information Systems Faculty of Engineering UNSW. "Remote synchronization method for the quasi-zenith satellite system." Publisher:University of New South Wales. Surveying & Spatial Information Systems, 2008. http://handle.unsw.edu.au/1959.4/41467.

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Анотація:
This dissertation presents a novel satellite timekeeping system which does not require on-board atomic clocks as used by existing navigation satellite systems such as GPS, GLONASS or the planned GALILEO system. This concept is differentiated by the employment of a synchronization framework combined with lightweight steerable on-board clocks which act as transponders re-broadcasting the precise time remotely provided by the time synchronization network located on the ground. This allows the system to operate optimally when satellites are in direct contact with the ground station, making it suitable for a system like the Japanese Quasi-Zenith Satellite System, QZSS. Low satellite mass and low satellite manufacturing and launch cost are significant advantages of this novel system. Two possible implementations of the time synchronization network for QZSS are presented. Additionally, the problem of satellite communication interruption is analyzed and a solution is presented. Finally a positioning and timing quality analysis, aimed to provide understanding of the actual timing quality requirements for QZSS, is presented.
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4

Nalluri, Rambabu. "Development of a Real-Time Monitor for Satellite Anomalous Clock and Orbit Errors." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1275621657.

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5

Wang, Yan [Verfasser]. "On inter-satellite laser ranging, clock synchronization and gravitational wave data analysis / Yan Wang." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2014. http://d-nb.info/1063006260/34.

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6

HUANG, WEI. "Improved PPP for time and frequency transfer and real-time detection of GNSS satellite clock frequency anomalies." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2842527.

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7

Marques, Haroldo Antonio [UNESP]. "PPP em tempo real com estimativa das correções dos relógios dos satélites no contexto de rede GNSS." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/100256.

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Анотація:
Made available in DSpace on 2014-06-11T19:30:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-04-26Bitstream added on 2014-06-13T20:40:33Z : No. of bitstreams: 1 marques_ha_dr_prud.pdf: 2254240 bytes, checksum: 4a444b57aeb7b0a9588734345c28c149 (MD5)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Dentre os diversos métodos possíveis de posicionamento GNSS, encontra-se atualmente em evidência aqueles que proporcionam posicionamento em tempo real (ou próximo do tempo real) com acurácia ao nível centimétrico ou decimétrico. Nesse caso, destaca-se o PPP em tempo real, o qual requer a disponibilização de órbitas precisas em tempo real, bem como as correções ou erros dos relógios dos satélites. Atualmente, é possível utilizar as efemérides preditas denominadas IGU, as quais são disponibilizadas pelo IGS, porém, as correções dos relógios dos satélites contidas nessas efemérides não apresentam acurácia suficiente (3 ns @ 0,9 m) para obtenção de resultados com qualidade centimétrica no PPP. Logo, é necessário pesquisar e desenvolver metodologias adequadas para estimar as correções dos relógios dos satélites com melhor qualidade para aplicação no PPP em tempo real. A estimativa das correções dos relógios dos satélites pode ser realizada com base numa rede de estações GNSS de referência. Nesta tese, a metodologia adotada para estimar estas correções consiste em realizar o ajustamento dos dados no modo PPP para uma rede de estações GNSS. Dessa forma, todos os efeitos sistemáticos envolvidos com os sinais dos satélites GNSS devem ser modelados adequadamente para cada estação da rede, realizando-se assim a estratégia denominada de PPP em rede. Uma vez estimadas as correções dos relógios dos satélites em tempo real, estas devem ser enviadas ao usuário, o qual as utilizará para aplicação...
Among several possible methods of GNSS positioning, it is currently in evidence those that provide real time positioning (or near real time) with accuracy near to decimeter or centimeter level. In this case, we highlight the real time PPP method, which requires the availability of real time precise orbits and corrections or errors of the satellites clocks. Currently, it is possible to use the predicted IGU ephemerides which are made available by the IGS centers. However, the satellites clocks corrections available in the IGU do not present enough accuracy (3 ns @ 0.9 m) to accomplish real time PPP with the level of centimeter accuracy. Therefore, it is necessary to research and develop appropriate methodologies for estimating the satellite clock corrections in real time with better quality for real time PPP aplication. The estimation of satellite clock corrections can be performed based on a GNSS network of reference. In this PhD thesis, the methodology used to estimate these corrections is based on the adjustment of data in the PPP mode for stations of a GNSS network. Thus, all systematic effects involved with the GNSS satellite signals must... (Complete abstract click electronic access below)
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Marques, Haroldo Antonio. "PPP em tempo real com estimativa das correções dos relógios dos satélites no contexto de rede GNSS /." Presidente Prudente : [s.n.], 2012. http://hdl.handle.net/11449/100256.

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Orientador: João Francisco Galera Monico
Coorientador: Milton Hirokazu Shimabukuro
Coorientador: : Marcio de Oliveira Aquino
Banca: Celso Braga de Mendonça
Banca: Hélio Koiti Kuga
Banca: Silvio Jacks dos Anjos Garnés
Resumo: Dentre os diversos métodos possíveis de posicionamento GNSS, encontra-se atualmente em evidência aqueles que proporcionam posicionamento em tempo real (ou próximo do tempo real) com acurácia ao nível centimétrico ou decimétrico. Nesse caso, destaca-se o PPP em tempo real, o qual requer a disponibilização de órbitas precisas em tempo real, bem como as correções ou erros dos relógios dos satélites. Atualmente, é possível utilizar as efemérides preditas denominadas IGU, as quais são disponibilizadas pelo IGS, porém, as correções dos relógios dos satélites contidas nessas efemérides não apresentam acurácia suficiente (3 ns @ 0,9 m) para obtenção de resultados com qualidade centimétrica no PPP. Logo, é necessário pesquisar e desenvolver metodologias adequadas para estimar as correções dos relógios dos satélites com melhor qualidade para aplicação no PPP em tempo real. A estimativa das correções dos relógios dos satélites pode ser realizada com base numa rede de estações GNSS de referência. Nesta tese, a metodologia adotada para estimar estas correções consiste em realizar o ajustamento dos dados no modo PPP para uma rede de estações GNSS. Dessa forma, todos os efeitos sistemáticos envolvidos com os sinais dos satélites GNSS devem ser modelados adequadamente para cada estação da rede, realizando-se assim a estratégia denominada de PPP em rede. Uma vez estimadas as correções dos relógios dos satélites em tempo real, estas devem ser enviadas ao usuário, o qual as utilizará para aplicação... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Among several possible methods of GNSS positioning, it is currently in evidence those that provide real time positioning (or near real time) with accuracy near to decimeter or centimeter level. In this case, we highlight the real time PPP method, which requires the availability of real time precise orbits and corrections or errors of the satellites clocks. Currently, it is possible to use the predicted IGU ephemerides which are made available by the IGS centers. However, the satellites clocks corrections available in the IGU do not present enough accuracy (3 ns @ 0.9 m) to accomplish real time PPP with the level of centimeter accuracy. Therefore, it is necessary to research and develop appropriate methodologies for estimating the satellite clock corrections in real time with better quality for real time PPP aplication. The estimation of satellite clock corrections can be performed based on a GNSS network of reference. In this PhD thesis, the methodology used to estimate these corrections is based on the adjustment of data in the PPP mode for stations of a GNSS network. Thus, all systematic effects involved with the GNSS satellite signals must... (Complete abstract click electronic access below)
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CERNIGLIARO, ALICE. "Timing Experiments with Global Navigation Satellite System Clocks." Doctoral thesis, Politecnico di Torino, 2012. http://hdl.handle.net/11583/2499219.

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The science of timekeeping is crucial in many dierent applications around the world. One of the most signicative applications in which time and frequency metrology has an essential role are Global Navigation Satellite Systems (GNSS). Any satellite navigation system indeed, is based on the transmission of signals from a constellation of satellites: processing these signals it is possible to estimate the position of a user, provided that the time of transmission is indicated with extremely high accuracy. In fact, being the distance measured from a time, any error in the measure of time will be directly mapped into an error in the user position, which has to be kept below its specied limits. The positioning accuracy is widely determined by the clocks quality. It is why all the satellites need to y very accurate atomic clocks: fundamental for their excellent stability. An agreement between the European Community and the European Space Agency (ESA) gave rise to a new European satellite system: Galileo. The Istituto Nazionale di Ricerca Metrologica (INRiM) is deeply involved in the Galileo project, mainly concerning the activities related to the experimental phases, such as the generation of an experimental reference time scale for the system and the metrological characterization of atomic clocks employed onboard satellites. This thesis will describe the timing experiments carried out in these years of doctorate with GNSS clocks, both with space and ground clocks, within the experimental phases of the Galileo project.
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Gonzalez, Martinez Francisco Javier [Verfasser]. "Performance of new GNSS satellite clocks / Francisco Javier Gonzalez Martinez." Karlsruhe : KIT Scientific Publishing, 2013. http://www.ksp.kit.edu.

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Книги з теми "Satellite clock"

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Sun, Jiadong. China Satellite Navigation Conference (CSNC) 2013 Proceedings: Precise Orbit Determination & Positioning • Atomic Clock Technique & Time–Frequency System • Integrated Navigation & New Methods. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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2

S, Border J., and Jet Propulsion Laboratory (U.S.), eds. Observation model and parameter partials for the JPL geodetic GPS modeling software "GPSOMC". Pasadena, Calif: National Aeronautics and Space Administration, Jet Propulsion Laboratory, California Institute of Technology, 1988.

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3

Rubidium Atomic Clock - the Workhorse of Satellite Navigation. World Scientific Publishing Co Pte Ltd, 2019.

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Sun, Jiadong, Wenhai Jiao, Haitao Wu, and Chuang Shi. China Satellite Navigation Conference 2013 Proceedings: Precise Orbit Determination and Positioning * Atomic Clock Technique and Time-Frequency System * Integrated Navigation and New Methods. Springer Berlin / Heidelberg, 2015.

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5

Wang, Yan. First-stage LISA Data Processing and Gravitational Wave Data Analysis: Ultraprecise Inter-satellite Laser Ranging, Clock Synchronization and Novel ... Data Analysis Algorithms. Springer, 2015.

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6

Wang, Yan. First-stage LISA Data Processing and Gravitational Wave Data Analysis: Ultraprecise Inter-satellite Laser Ranging, Clock Synchronization and Novel ... Data Analysis Algorithms. Springer, 2019.

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7

Wang, Yan. First-Stage LISA Data Processing and Gravitational Wave Data Analysis: Ultraprecise Inter-Satellite Laser Ranging, Clock Synchronization and Novel Gravitational Wave Data Analysis Algorithms. Springer London, Limited, 2016.

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Martinez, Francisco Javier Gonzalez. Performance of New GNSS Satellite Clocks. Saint Philip Street Press, 2020.

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Martinez, Francisco Javier Gonzalez. Performance of New GNSS Satellite Clocks. Saint Philip Street Press, 2020.

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Spence, John C. H. Lightspeed. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198841968.001.0001.

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This book tells the human story of one of mankind’s greatest intellectual adventures—how we understood that light travels at a finite speed, so that when we look up at the stars we are looking back in time. And how the search for an absolute frame of reference in the universe led inexorably to Einstein’s famous equation E = mc2 for the energy released by nuclear weapons which also powers our sun and the stars. From the ancient Greeks measuring the distance to the Sun, to today’s satellite navigation and Einstein’s theories, the book takes the reader on a gripping historical journey. How Galileo with his telescope discovered the moons of Jupiter and used their eclipses as a global clock, allowing travellers to find their longitude. How Roemer, noticing that the eclipses were sometimes late, used this delay to obtain the first measurement of the speed of light, which takes eight minutes to get to us from the Sun. From the international collaborations to observe the transits of Venus, including Cook’s voyage to Australia, to the extraordinary achievements of Young and Fresnel, whose discoveries eventually taught us that light travels as a wave but arrives as a particle, and the quantum weirdness which follows. In the nineteenth century we find Faraday and Maxwell, struggling to understand how light can propagate through the vacuum of space unless it is filled with a ghostly vortex Aether foam. We follow the brilliantly gifted experimentalists Hertz, discoverer of radio, Michelson with his search for the Aether wind, and Foucault and Fizeau with their spinning mirrors and lightbeams across the rooftops of Paris. The difficulties of sending messages faster than light, using quantum entanglement, and the reality of the quantum world conclude this saga.
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Частини книг з теми "Satellite clock"

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Wang, Bin, and Junping Chen. "Analysis of BDS Satellite Clock in Orbit with ODTS and TWTT Satellite Clock Data." In Lecture Notes in Electrical Engineering, 615–22. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0005-9_50.

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Xu, Xueqing, Shanshi Zhou, Si Shi, Xiaogong Hu, and Yonghong Zhou. "Performance Evaluation of the Beidou Satellite Clock and Prediction Analysis of Satellite Clock Bias." In Lecture Notes in Electrical Engineering, 27–35. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0940-2_3.

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3

Zou, Junping, and Jiexian Wang. "Real-Time Estimation of GPS Satellite Clock Errors and Its Precise Point Positioning Performance." In Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications, 823–30. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2456-9_83.

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AbstractThe current stochastic model in GNSS processing is constructed based on the prior experience, for example the ratio of the weight of the pseudorange and phase observations is generally determined as 1:10000. These methods ignore the precision differences of the different GNSS receivers and observation space. In this paper, the standard deviation of differenced ionosphere-free pseudorange and phase observations is computed with dual-frequency observations and then the weight ratio of the pseudorange and phase observations is obtained using the computed standard deviation. This method is introduced in satellite clock estimating and the data is processed. The results show that the presented method is feasible, with which the accuracy of the estimated satellite clock results is improved. The estimated satellite clock results are further adopted in PPP and the positioning results of the 10 users validate that the estimated satellite clock, which uses the presented method, can accelerate the convergence of PPP compared with the traditional method.
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Weiss, Jan P., Peter Steigenberger, and Tim Springer. "Orbit and Clock Product Generation." In Springer Handbook of Global Navigation Satellite Systems, 983–1010. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-42928-1_34.

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Jia, Yizhe, Lang Bian, and Lixin Zhang. "Satellite Autonomous Integrity Monitoring (SAIM) for Satellite Clock Slow Anomaly." In Lecture Notes in Electrical Engineering, 733–41. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6264-4_86.

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Kim, H., and K. Kwon. "GPS-based Clock Synchronization for Precision Time Management for LEO Remote Sensing Satellites." In Satellite Navigation Systems, 243–44. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0401-4_28.

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Svehla, Drazen. "Noise Model of the Galileo “mm-Clock”." In Geometrical Theory of Satellite Orbits and Gravity Field, 251–67. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-76873-1_18.

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Liu, Li, Xin Shi, Guifen Tang, Lan Du, Lingfeng Zhu, and Rui Guo. "Satellite Clock Offset Determination and Prediction with Integrating Regional Satellite-Ground and Inter-Satellite Data." In China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume III, 419–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54740-9_37.

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Zhang, Jinhui, Lan Du, and Ruopu Wang. "Estimating Stability and Reliability of Satellite Clock Jump." In Lecture Notes in Electrical Engineering, 391–401. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29193-7_38.

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Li, Li, Sichun Long, Haojun Li, and Liya Zhang. "Satellite Clock Bias Estimation Based on Backward Filtering." In Lecture Notes in Electrical Engineering, 25–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37398-5_3.

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Тези доповідей конференцій з теми "Satellite clock"

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Hai, Sha, Yang Wen-ke, Li Peng-peng, Zhang Guo-zhu, and Ou Gang. "Generation of Satellite Clock Offset for Global Navigation Satellite System Simulation." In 2013 Third International Conference on Instrumentation, Measurement, Computer, Communication and Control (IMCCC). IEEE, 2013. http://dx.doi.org/10.1109/imccc.2013.285.

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2

Martikainen, Simo, Robert Piche, and Simo Ali-Loytty. "Outlier-robust estimation of GPS satellite clock offsets." In 2012 International Conference on Localization and GNSS (ICL-GNSS). IEEE, 2012. http://dx.doi.org/10.1109/icl-gnss.2012.6253107.

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Cernigliaro, Alice, and Ilaria Sesia. "INRIM tool for satellite clock characterization in GNSS." In 2012 European Frequency and Time Forum (EFTF). IEEE, 2012. http://dx.doi.org/10.1109/eftf.2012.6502350.

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Vojtěch, Josef, Lada Altmannová, Vladimír Smotlacha, Radek Velc, Rudolf Vohnout, Harald Schnatz, Tara Cubel Liebisch, et al. "CLONETS-DS – Clock Network Services-Design Study Strategy and Innovation for Clock Services over Optical Fibre." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jth3a.27.

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Long-distance time and frequency transfer methods based on optical fibre links attractive both for very high-performance applications and also for many industrial and societal applications, and they complement and offer an alternative to radio- and satellite-based methods.
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Qin, Weijin, Pei Wei, and Xuhai Yang. "The method on determining invisible satellite-ground clock difference with inter-satellite-link." In 2016 IEEE International Frequency Control Symposium (IFCS). IEEE, 2016. http://dx.doi.org/10.1109/fcs.2016.7563534.

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Agullo, Ivan, Anthony J. Brady, Stav Haldar, Antía Lamas-Linares, W. Cyrus Proctor, and James E. Troupe. "Global Precision Time Distribution via Satellite-Based Entangled Photon Sources." In Quantum 2.0. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/quantum.2022.qth3a.3.

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High-precision time synchronization is a fundamental requirement for quantum networks. We simulate a global time distribution network by using quantum clock synchronization – sharing entangled photons between satellite-ground station pairs. This provides sub-nanosecond to picosecond level precision over intercontinental scales (better than GPS).
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Wang, Bin, and Junping Chen. "Preliminary analysis of frequency jumps in BDS satellite clock." In 2017 Forum on Cooperative Positioning and Service (CPGPS）. IEEE, 2017. http://dx.doi.org/10.1109/cpgps.2017.8075135.

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Wang, Bin, Junping Chen, and Binghao Wang. "Kalman filter simulation and characterization of BDS satellite clock." In 2018 European Frequency and Time Forum (EFTF). IEEE, 2018. http://dx.doi.org/10.1109/eftf.2018.8409053.

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Schuldt, Thilo, Martin Gohlke, Josep Sanjuan, Klaus Abich, Markus Oswald, Klaus D�ringshoff, Evgeny Kovalchuk, Achim Peters, and Claus Braxmaier. "Optical Clock Technologies for Future GNSS." In 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018). Institute of Navigation, 2018. http://dx.doi.org/10.33012/2018.15885.

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Zhang, Tian, Meiping Wu, Kaidong Zhang, Chunhua Wei, and Bingqing Feng. "GPS-based precise satellite clock offset estimation with the GPSTk." In 2014 IEEE Chinese Guidance, Navigation and Control Conference (CGNCC). IEEE, 2014. http://dx.doi.org/10.1109/cgncc.2014.7007326.

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Звіти організацій з теми "Satellite clock"

1

Senior, Ken L., Ronald L. Beard, and Jim R. Ray. Characterization of Periodic Variations in the GPS Satellite Clocks. Fort Belvoir, VA: Defense Technical Information Center, August 2008. http://dx.doi.org/10.21236/ada484727.

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