一种新的多频段雷达信号相干算法

A novel coherent algorithm of multiband radar echo

多频段雷达信号融合成像技术是提高目标距离像分辨率的一种有效方法。相干处理是多频段融合成像的前提和关键。本文分析了用不同雷达测得的动目标频率响应间的非相干量。针对传统相干方法所需的频谱外推所带来的低信噪比下相干精度差、计算量较大的缺陷,本文提出利用不同频段强散射中心极点信息的差异来估计非相干量,并对算法的处理流程和实际应用中可能遇到的几个问题进行了细致分析。计算机仿真实验和实测数据处理结果表明所提方法有效地改善了估计效果并降低了运算量。

The signal fusion of multiple frequency bands and multiple radars is an effective method to improve the range profile resolution.Coherent processing is an important step before multiband fusion.This paper analyzes the uncoherence between the moving target＇s frequency responses from different radars.Usually traditional coherent methods need to extrapolate the spectra of subbands,which causes depravation of coherent precision in low signal-to-noise and brings heavy computer load.So the authors present a coherent method using the poles＇information directly without extrapolating the spectra.Also the processing flow and several problems which we will encounter are particularly analyzed.The validity of the presented method is proved through computer simulation and real world data experiment.