高频地波雷达消除一阶海杂波对目标测距影响的方法

在强海杂波条件下的高频地波雷达中,由于相干积累所需的时间较长,并且由于信号带宽较窄、距离门较宽,所以无法得到目标在积累时间内的距离变化。为此,提出了一种在多普勒域进行滤波的方法,首先滤除一阶海杂波对目标回波的影响,然后利用Chirp-z变换和稀疏表示等办法来提高积累时间内的距离精度和分辨率。理论分析和仿真验证了该方法的可行性。

Method to Eliminate the Effect of First-order Sea Clutter on Target Range in High Frequency Ground Wave Radar

In high frequency(HF) ground wave radar with strong sea clutter, because the coherent integration need long time, and the signal bandwidth is very narrow and the range cell is very wide, the range change of target in the coherent integrated time can not be obtained. This paper presents a method to eliminate the effect on the first-order sea clutter to target echo by filtering in Doppler domain. And then Chirp-z transform and sparse representation are used to improve the range precision and resolution in the integration time.Theoretical analysis and simulations show that the method is feasible.