Abstract
The echo of shipborne high-frequency surface wave radar (HFSWR) is modulated by six-degrees-of-freedom (6-DOF) motion, affecting the detection of the target and the remote sensing of ocean surface dynamics parameters. Commonly, motion compensation methods of shipborne HFSWR describe each aspect of the 6-DOF motion as the superposition of sinusoidal motion, which results in the effect of motion compensation affected by the precision of 6-DOF motion parameters. A motion compensation method based on dual reference radio frequency (RF) signals is proposed in this paper, without depending on a sinusoidal motion model to describe the 6-DOF motion. By using the motion compensation parameters, which are relevant to the motion attitude and calculated from the information of dual reference RF signals located onshore, the method realizes the compensation of shipborne HFSWR echo modulated by platform 6-DOF motion. This paper proposes the extraction of reference RF signals from radar echo and analyzes the influence of the location of the reference RF signals’ emission source on the motion compensation method. The result shows that a good motion compensation effect is achieved in eliminating the influence of 6-DOF motion modulation. In addition, a traversal of different reference RF signals’ emission source locations is conducted, and the simulation results show that the method proposed in this paper has universality.
Highlights
High-frequency surface wave radar (HFSWR) has been widely used in the over-thehorizon detection and the observation of marine dynamic environmental parameters for their real-time and all-weather characteristics
To solve the problems above, this paper proposes a motion compensation method based on dual reference radio frequency (RF) signals to obtain motion compensation parameters and to compensate for the 6-DOF motion modulation of the shipborne platform
This paper proposed a method of calculating motion compensation parameters and compensating for 6-DOF motion modulation by using dual reference RF signals
Summary
High-frequency surface wave radar (HFSWR) has been widely used in the over-thehorizon detection and the observation of marine dynamic environmental parameters for their real-time and all-weather characteristics. In addition to the advantages of shore-based HFSWR, shipborne HFSWR is more flexible and can provide a larger detection range. It has received extensive attention in recent years [1,2,3,4,5]. The echo signal of shipborne HFSWR is modulated by the motion of the shipborne platform, resulting in additional peaks and the broadening of the first-order Bragg peaks on the echo Doppler spectrum, casting a negative influence on radar target monitoring and the remote sensing of ocean surface dynamics parameters. Khoury et al derived the received signal model of the moving
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