Anti-Time-Delay Repeater Jamming under Sea Surface Target Spatial Position Constraint

Aiming at the problem of time-delay repeater jamming in the sea surface target detection environment, it is difficult for radar to discriminate false targets from the time domain and frequency domain. This paper proposes an anti-time-delay repeater jamming method based on spatial position constraint. The spatial position constraint method is a good candidate, which combines the radar's position obtained by radar altimeter with the target's angle obtained by amplitude-comparison angle measurement, and then solves the desired range of the target. In the multi-target tracking mode, by comparing the measured range of the detected target with the expected range under the spatial constraint, it can be judged whether the target is located on the sea surface, thereby determining the target position and the trajectory, and eliminating the time-delay repeater jamming. By analyzing the radius of the spatial error region caused by the angle error and the delay corresponding to the radius, the obtained correlation threshold can as an assistant to discriminate the false target. This method reduces complicated signal processing and avoids excessive computation. The simulation results show that the proposed method can easily and effectively eliminate the time-delay repeater jamming and obtain the target position.