BTH/OTH Radar and Maritime Surveillance Radar Overview
The article discusses BTH/OTH radar systems and maritime surveillance radars, exploring their functionalities, benefits, drawbacks, and real-world examples. It delves into the working principles of OTH radar, showcasing how it operates through the ionosphere. Additionally, it covers the concept of maritime surveillance radar and provides insights into its applications in detecting and tracking targets at sea.
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BTH/OTH Radar and Maritime Surveillance Radar
What is BTH/OTH Radar? [1] G. A. Fabrizio, Introduction, in High Frequency Over-the-Horizon Radar: Fundamental Principles, Signal Processing, and Practical Applications, 1st ed, New York: McGraw-Hill, 2013
How Does OTH Radar Work? Fig. 1: Equivalent Virtual and Real Paths of a HF Signal travelling through the ionosphere [2] [2] G. A. Fabrizio, Skywave Propagation, in High Frequency Over-the-Horizon Radar: Fundamental Principles, Signal Processing, and Practical Applications, 1st ed, New York: McGraw-Hill, 2013 [3] G. A. Fabrizio, Surface-Wave Radar, in High Frequency Over-the-Horizon Radar: Fundamental Principles, Signal Processing, and Practical Applications, 1st ed, New York: McGraw-Hill, 2013
Benefits/Drawbacks of OTH Compared to LOS Fig. 2: Limitations of Ground-based and Airborne LOS Radars [1] Fig. 3: Maximum Ground and Air Ranges of LOS Radars [1]
Examples of OTH Radars Fig 4: Locations of JORN radar sites and coverage areas [4] Fig 5: JORN Transmit Array located in Laverton, Western Australia [4] Fig 6: ROTHR Antenna Array [5] [4] D. A. Holdsworth, K. Mulder, and M. D. E. Turley, Jindalee Operational Radar Network: New Growth from Old Roots, 2022 IEEE Radar Conference (RadarConf22), Mar. 2022. doi:10.1109/radarconf2248738.2022.9764214 [5] Raytheon Technologies Selected as Lead Systems Integrator for Maritime Over-the-Horizon Radar, RTX, https://www.rtx.com/raytheon/news/2023/03/06/rtx-selected-as-lead-systems-integrator-for-othr (accessed Nov. 4, 2023).
Maritime Surveillance Radar
What is Maritime Surveillance Radar? [6] Lacomme, P. Hardange, J-P. Marchais, J-C. Normant, E.. (2001). Air and Spaceborne Radar Systems Maritime Target Detection and Tracking. William Andrew Publishing/Noyes. Retrieved from https://app.knovel.com/hotlink/pdf/id:kt003VBHY1/air-spaceborne-radar/maritime-target-detection [7] Martino, Gerardo Di Iodice, Antonio. (2021). Maritime Surveillance with Synthetic Aperture Radar - References. Institution of Engineering and Technology (The IET). Retrieved from https://app.knovel.com/hotlink/pdf/id:kt012GYAN2/maritime-surveillance/references
Spaceborne SAR Fig. 7: Picture of CFAR sliding window [8] Fig. 8: Example of sublook spectral analysis [8] [8] Martino, Gerardo Di Iodice, Antonio. (2021). Maritime Surveillance with Synthetic Aperture Radar 6. Ship Detection. Institution of Engineering and Technology (The IET). Retrieved from https://app.knovel.com/hotlink/pdf/id:kt012GYC71/maritime-surveillance/ship-detection
HFSW Radar [9] S. Maresca, P. Braca, J. Horstmann, and R. Grasso, Maritime surveillance using multiple high-frequency surface-wave radars, IEEE Transactions on Geoscience and Remote Sensing, vol. 52, no. 8, pp. 5056 5071, Aug. 2014. doi:10.1109/tgrs.2013.2286741 [10] D. S. Ilcev, Introduction to Coastal HF maritime surveillance radars, Polish Maritime Research, vol. 26, no. 3, pp. 153 162, 2019. doi:10.2478/pomr- 2019-0056
