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3. Combined Coherent and Non-Coherent Long-Time Integration Method for High-Speed Target Detection Using High-Frequency Radar.

Author

Liu, Gan, Tian, Yingwei, Wen, Biyang, and Liu, Chen

Subjects
RADON transforms, FOURIER transforms, SIGNAL-to-noise ratio, BISTATIC radar, MOTION, DOPPLER effect
Abstract

High-frequency (HF) radar plays a crucial role in the detection of far-range, stealth, and high-speed targets. Nevertheless, the echo signal of such targets typically exhibits a low signal-to-noise ratio (SNR) and significant amplitude fluctuations because their radar cross-section (RCS) accounting for the HF band is in the resonance region. While enhancing detection performance often requires long-time integration, existing algorithms inadequately consider the impact of amplitude fluctuation. In response to this challenge, this article introduces an improved approach based on coherent and non-coherent integration. Initially, coherent integration, employing the generalized Radon Fourier transform (GRFT), is utilized to derive a candidate detection set of targets' range–time trajectories. This involves a joint solution for range migration (RM) and Doppler frequency migration (DFM) through a multi-parameter motion model search. Subsequently, the removal of low SNR pulses, followed by non-coherent integration, is implemented to mitigate amplitude fluctuation, referred to as Amplitude Fluctuation Suppression (AFS), and refine the detection outcomes. Both simulation and experiment results are provided to prove the effectiveness of the proposed AFS-GRFT algorithm. [ABSTRACT FROM AUTHOR]

Published
2024
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31. HF radar wave and wind measurement over the Eastern China Sea

Author

Huang, Weimin, Wu, Shicai, Gill, Eric, Wen, Biyang, and Hou, Jiechang

Subjects
Ocean waves -- Measurement, Ocean waves -- Investigations, Ocean waves -- Influence, Remote sensing -- Methods, Remote sensing -- Investigations, Radar meteorology -- Investigations, Radar meteorology -- Equipment and supplies, Ocean-atmosphere interaction -- Investigations, Ocean-atmosphere interaction -- Measurement, Company legal issue, Business, Earth sciences, Electronics and electrical industries
Abstract

High-frequency (HF) radar can be employed to measure sea surface state parameters such as waveheight, wind field, and surface current velocity. This paper describes the application of the HF ground wave radar in remote sensing the surface conditions over the Eastern China Sea in October 2000. The radar, referred to as the OSMAR2000, was developed by Wuhan University. Preliminary wave spectra, waveheights, and wind fields estimated from the collected data are presented and compared with ship-recorded measurements where such are available. The range for wind direction sensing is up to 200 km. Wave information and wind speed can be provided up to a range of 120 km. The mean difference between radar- and ship-measured significant waveheight is 0.323 m; wind direction is measured within 20[degrees]; and wind speed to within 0.6 m/s. With such agreement being fairly reasonable, the feasibility of the inversion algorithm and the ocean state real-time sensing capability of OSMAR2000 are demonstrated. Index Terms--HF radar, ocean wave spectrum, remote sensing, waveheight, wind field.

Published
2002

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