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Academic literature on the topic 'Over The Horizon Radar Sky Wave'

Author: Grafiati
Published: 10 March 2023

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Journal articles on the topic "Over The Horizon Radar Sky Wave"

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Saavedra, Zenon, Diego Zimmerman, Miguel A. Cabrera, and Ana G. Elias. "Sky-wave over-the-horizon radar simulation tool." IET Radar, Sonar & Navigation 14, no. 11 (November 1, 2020): 1773–77. http://dx.doi.org/10.1049/iet-rsn.2020.0158.

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Ren, Fangyu, Huotao Gao, and Lijuan Yang. "Distributed Multistatic Sky-Wave Over-The-Horizon Radar Based on the Doppler Frequency for Marine Target Positioning." Electronics 10, no. 12 (June 18, 2021): 1472. http://dx.doi.org/10.3390/electronics10121472.

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Maritime safety issues have aroused great attention, and it has become a difficult problem to use the sky-wave over-the-horizon radar system to locate foreign targets or perform emergency rescue quickly and timely. In this paper, a distributed multi-point sky-wave over-the-horizon radar system is used to locate marine targets. A positioning algorithm based on the Doppler frequency is proposed, namely, the two-step weighted least squares (2WLS) method. This algorithm first converts the WGS-48 geodetic coordinates of the transceiver station to spatial rectangular coordinates; then, introduces intermediate variables to convert the nonlinear optimization problem into a linear problem. In the 2WLS method, four mobile transmitters and four mobile receivers are set up, and the Doppler frequency is calculated by transmitting and receiving signals at regular intervals; it is proven that the 2WLS algorithm has always maintained a better positioning accuracy than the WLS algorithm as the error continues to increase with a certain ionospheric height measurement error and the Doppler frequency measurement error. This paper provides an effective method for the sky-wave over-the-horizon radar to locate maritime targets.
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Su, H. T., H. Liu, P. Shui, and Z. Bao. "Adaptive HF interference cancellation for sky wave over-the-horizon radar." Electronics Letters 47, no. 1 (2011): 50. http://dx.doi.org/10.1049/el.2010.2821.

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Guo, Xin, Jin-Lin Ni, and Guo-Sui Liu. "Architecture and signal processing of sky wave over-the-horizon radar." Radio Science 38, no. 5 (October 2003): n/a. http://dx.doi.org/10.1029/2002rs002789.

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Hu, Jinfeng, Cao Jian, Chen Zhuo, Huiyong Li, and Julan Xie. "Knowledge-Aided Ocean Clutter Suppression Method for Sky-Wave Over-the-Horizon Radar." IEEE Geoscience and Remote Sensing Letters 15, no. 3 (March 2018): 355–58. http://dx.doi.org/10.1109/lgrs.2017.2787693.

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Thayaparan, Thayananthan, Justin Marchioni, Alison Kelsall, and Ryan Riddolls. "Improved Frequency Monitoring System for Sky-Wave Over-the-Horizon Radar in Canada." IEEE Geoscience and Remote Sensing Letters 17, no. 4 (April 2020): 606–10. http://dx.doi.org/10.1109/lgrs.2019.2928172.

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He, Huan, Yi Chun Pan, and Fang Zhi Geng. "Research on Backscattering of Sky Wave from Sea Surface." Applied Mechanics and Materials 602-605 (August 2014): 2709–12. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.2709.

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For a long period, the sky-wave over-the-horizon radar (OTHR) has difficulty in detecting ship under the background of sea clutter, and it is difficult to apply the existing sea clutter model established in surface wave propagation mode to the sky-wave OTHR sea clutter suppression. Therefore, the difference between surface wave and sky wave propagation mode is analyzed firstly, then the scope of grazing angle about sky wave beam is calculated, finally the backscattering coefficients of sky wave from sea surface are derived by perturbation method and the backscattering mechanisms of sky wave from sea surface are analyzed. Results show that the mechanisms observe Bragg scattering mechanism. The backscattering coefficients of sky wave from sea surface which are given in this paper for the first time are significant for sky-wave OTHR sea clutter suppression.
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Chengyu, Hou, Ke Guo, Shi Tiange, and Wang Yuxin. "Study on the Detectability of the Sky-Surface Wave Hybrid Radar." Journal of Applied Mathematics 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/602075.

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Working in the HF (high-frequency) band and the transmitter and receiver locating separately, the sky-surface wave hybrid radar both has the capabilities of the OTHR (over-the-horizon radar) and the advantage of the bistatic radar. As the electromagnetic wave will be disturbed by the ionosphere, interfered by the sea clutter and attenuated by the sea surface, the detectability of this radar system is more complex. So, in this paper, we will discuss the problem detailedly. First of all, the radar equation is deduced based on the propagation of the electromagnetic wave. Then, how to calculate the effect of the ionosphere and the propagation loss is discussed. And an example based on the radar equation is given. At last, the ambiguity function is used to analyze the range and velocity resolution. From the result, we find that the resolution has relation with the location of the target and the height of reflection point of the ionosphere. But compared with the location, the effect of the ionospheric height can be ignored.
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Lin, Zhi Rong, Jin Feng Hu, Ya Xuan Zhang, Wan Ge Li, and Hui Ai. "Modified Ocean Clutter Cancellation Algorithm in Sky-Wave Radar." Applied Mechanics and Materials 644-650 (September 2014): 4249–52. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4249.

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In sky-wave over-the-horizon radar system, it is difficult to detect ship because the Doppler shift of the ship is very close to the strong ocean clutter. Traditional clutter cancellation algorithms suppress ocean clutter by estimating clutter parameters and removing the clutter signal in time domain. However, they estimate the clutter parameters by the maximum value of the post DFT spectrum and thus lead to the low accuracy. In this paper, a modified clutter cancellation algorithm is proposed, which corrects estimated frequency by utilizing the three maximum spectrum values and overcomes the poor cancellation performance caused by inaccurate estimation of clutter parameters. Compared with traditional clutter cancellation algorithm, the proposed algorithm can get more accurate clutter parameters and reduce the energy and expansion of the remaining clutter. Simulation demonstrated that the proposed algorithm had a better clutter cancellation performance compared to the traditional ones.
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Jiang, Wei, Wei-bo Deng, and Qiang Yang. "Analyse of Sea Clutter for HF over the Horizon Hybrid Sky-surface Wave Radar." Journal of Electronics & Information Technology 33, no. 8 (September 9, 2011): 1786–91. http://dx.doi.org/10.3724/sp.j.1146.2010.01339.

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Dissertations / Theses on the topic "Over The Horizon Radar Sky Wave"

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SERMI, FRANCESCO. "Digital processing of the echo received by an Over The Horizon (OTHR) Sky-Wave (SW) Radar System for Geo-Referencing of radar footprint through the identification of Sea/Land transition." Doctoral thesis, 2013. http://hdl.handle.net/2158/799653.

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Abstract: Over-the-horizon radars (OTHRs) are HF-band systems that, via surface propagation (ground-wave or surface-wave) or ionospheric re ection (sky-wave), cover an area that is located well beyond the horizon. Though based on an assessed technology, OTHRs are attracting today much interest, thanks to the relevant improvements in signal processing and data storage techniques. By exploiting the propagation mechanisms of HF waves in the Terrestrial Atmosphere, the OTHR is able to overcome the horizon line, that represents a natural boundary for every ground-based microwave radar. In the case of sky-wave OTHR, the re flection of the signals by the Ionosphere allows the system to achieve range distances up to about 3000 km. Nevertheless, the employment of the Ionosphere as part of the propagation-channel introduces an intrinsic uncertainty about the actual HF wave propagation path and, consequently, about the actual geographic position of the radar footprint. In fact, the non-homogeneous structure and time-dependent behavior of the Ionosphere make the a priori models for the propagation channel absolutely useless for a correct Geo-referencing of the received echo. Therefore, every HF OTHR-SW application must include a process to associated the received signals to unambiguous geographic coordinates. Such a process, referred to as coordinate registration (CR), generally relies on an ionospheric model, based on seasonal and daily ionospheric statistics within the radar operating area. Several current OTHR-SW systems perform a periodic update of the ionospheric model exploiting information gathered by ionosonde networks or directly collected from the OTHR with a dedicated procedure. Both approaches exhibit several limitations, leading to a correct characterization of the ionosphere only when it is in particularly steady conditions. The present research is focused on the study and development of a new different approach to the CR problem for OTHR-SW systems. This approach, referred to as Sea/Land Transition Identification (SLTI), takes advantage from the a priori knowledge of the Geo-morphological structure of the surveillance area in order to compensate for the uncertainties introduced by the Ionosphere. In fact, as suggested by the name of the method, the shape of the coastline profiles within the surveillance area are employed as position-references for the geo-referencing of the received radar echo. This task is possible through a basic time analysis of the echo, thanks to the marked difference in the values of the HF back-scattering coefficient for sea and land regions. The SLTI method is based on the maximization of the cross-correlation between the received radar echo and the surface mask signatures for the surveillance area. It can be employed in real time by the system, during its typical surveillance routine and besides the collected data can be exploited to estimate some Ionospheric parameters in order to periodically update and correct the employed statistical model. After a general introduction about the OTHR sensors and a more detailed description of the sky-wave system who we refer to in the present work, the state of the art for the CR procedures actually employed by OTHR-SW is presented. Hence the SLTI method is outlined together with the numerical model of the whole OTHR-SW scenario. The application of the method, in this scenario simulated under simplifying operative hypothesis, is described with the help of some examples for both the CR procedure and the Ionospheric probing task. Within these examples of application of the SLTI method, the minimum requirements in terms of received signal-to-noise ratio (SNR) and differential sea/land backscattering coefficients necessary to achieve a given accuracy in the range estimate are pointed out. Finally the further developments of the SLTI method and some possible improvement of the simulated OTHR-SW's scenario are pointed out.
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Conference papers on the topic "Over The Horizon Radar Sky Wave"

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Xin Guo, JinLin Ni, GuoSui Liu, and HongBo Sun. "Signal processing of sky wave over-the-horizon radar." In IEEE International Conference on Acoustics Speech and Signal Processing ICASSP-02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.1004784.

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Guo, Xin, JinLin Ni, GuoSui Liu, and HongBo Sun. "Signal processing of sky wave over-the-horizon radar." In Proceedings of ICASSP '02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.5745523.

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Xie, Chao, Yichun Pan, and Huan He. "Based on perturbation method of distributed sky-wave over the horizon radar sea clutter modeling." In 2016 CIE International Conference on Radar (RADAR). IEEE, 2016. http://dx.doi.org/10.1109/radar.2016.8059363.

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Luo, Zhongtao, Zishu He, Jun Li, Kun Lu, and Xuyuan Chen. "Waveform design based on environmental sensing for sky-wave over-the-horizon radar." In 2015 IEEE International Radar Conference (RadarCon). IEEE, 2015. http://dx.doi.org/10.1109/radar.2015.7131056.

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Jin, Shuling, Yan Liang, Peng He, Lizhen Wang, and Quan Pan. "Two-Hierarchical Hough Transform for Sky-wave Over-the-Horizon Radar Track Initiation." In 2006 CIE International Conference on Radar. IEEE, 2006. http://dx.doi.org/10.1109/icr.2006.343178.

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Chen, Xia, Hongwen Yang, and Weidong Hu. "Track clustering based data association for sky-wave Over-the-horizon Radar." In 2010 10th International Conference on Signal Processing (ICSP 2010). IEEE, 2010. http://dx.doi.org/10.1109/icosp.2010.5657124.

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Cuccoli, Fabrizio, Luca Facheris, and Francesco Sermi. "Over the horizon sky wave radar simulator for ionosphere and earth surface sounding." In IGARSS 2011 - 2011 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2011. http://dx.doi.org/10.1109/igarss.2011.6048946.

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Thayaparan, Thayananthan, Hannah Villeneuve, Michael Warrington, David R. Themens, Benjamin Reid, Taylor Cameron, and Robyn Fiori. "Real-Time Frequency Management System (FMS) for Sky-Wave High-Latitude Over-the-Horizon Radar (OTHR)." In 2022 23rd International Radar Symposium (IRS). IEEE, 2022. http://dx.doi.org/10.23919/irs54158.2022.9905013.

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Holdsworth, David A. "Over-the-horizon radar continuous-wave interference suppression using harmonic least-squares fitting." In 2013 International Conference on Radar. IEEE, 2013. http://dx.doi.org/10.1109/radar.2013.6651969.

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Wang Jian. "Target initiation of high frequency surface wave Over-the-Horizon Radar based on information entropy theory." In 2011 IEEE CIE International Conference on Radar (Radar). IEEE, 2011. http://dx.doi.org/10.1109/cie-radar.2011.6159494.

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