Abstract
For shipborne high-frequency surface wave radar (HFSWR), the movement of the ship has a great impact on the radar echo, thus affecting target detection performance. In this paper, the characteristics of the target echo spectrum and the motion compensation methods for shipborne HFSWR are investigated. Firstly, simulation analysis of echo from a moving target under different ship motion conditions was conducted with a focus on the frequency shift and broadening characteristics of the target echo spectrum. The simulation results show that the non-uniform linear motion and yaw of the ship will shift and broaden the target echoes, resulting in signal-to-noise ratio (SNR) reduction. When the ship velocity and yaw angle change periodically, false target echo peaks will appear in the echo spectrum, which will reduce the accuracy of target detection. To tackle this problem, a motion compensation scheme for the target echo is proposed, including the heading compensation for the effect of yaw and the velocity compensation for non-uniform movement. The influence of the velocity and yaw angle measurement accuracy on the compensation results is also analyzed. Finally, the target echo characteristics and motion compensation method of shipborne HFSWR are verified with experimental data.
Highlights
IntroductionThe high-frequency surface wave radar (HFSWR) operating in the 3–30 MHz frequency band is able to provide continuous over-the-horizon detection under all-weather conditions
Published: 19 July 2021The high-frequency surface wave radar (HFSWR) operating in the 3–30 MHz frequency band is able to provide continuous over-the-horizon detection under all-weather conditions.It can detect and track a marine target continuously and monitor ocean state within a large offshore area in real time [1]
The objective of this paper is to investigate the characteristics of the target echo spectrum under different sailing conditions and develop a motion compensation method the attitude information of the ship collected by the inertial navigation system is usefu the attitude information of the ship collected by the inertial navigation system is usefu for the motion compensation processing
Summary
The high-frequency surface wave radar (HFSWR) operating in the 3–30 MHz frequency band is able to provide continuous over-the-horizon detection under all-weather conditions. It can detect and track a marine target continuously and monitor ocean state within a large offshore area in real time [1]. The antenna aperture is typically less than 100m and the transmission power is less than 1KW In such a case and for the same detection range, the amplitude of the target echo is much lower than that of shore-based radar, leading to a decrease in both detection rate and positioning accuracy. For the target echo received by the radar on a moving vessel, its frequency shift depends on its motion characteristics, and
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