基于Chirp Z变换的海面目标帧间非相参积累技术

为提升雷达对海面微弱目标的探测能力,提出基于Chirp Z变换的多圈扫描帧间非相参积累技术。首先,建立多圈扫描采用不同载频时的雷达回波信号模型。然后,提出基于Chirp Z变换的运动目标帧间多普勒校正和距离走动补偿方法,使得多圈扫描数据经过处理后,目标出现在相同的距离多普勒检测单元内,从而可以直接进行帧间的非相参积累,实现对微弱目标检测性能的提升。最后,结合仿真试验和实测数据,验证了所提方法的有效性。

Interframe noncoherent integration technology based on Chirp Z transform for sea surface target

In order to improve the detection ability of radar to weak target on the sea surface,a noncohe-rent integration technology based on Chirp Z transform is proposed.Firstly,the radar echo signal model with different carrier frequencies in multiple cycle scanning is established.Then,a method of interframe Doppler correction and range walk compensation for moving targets based on Chirp Z transform is proposed,which makes the target appear in the same range-Doppler detection unit after processing the multiple cycle scanning data,so that the interframe noncoherent integration can be carried out directly,and the performance of weak target detection can be improved.Finally,the effectiveness of the proposed method is verified by the simulation test and the measured data.