基于高重频随机频率步进宽带雷达的频率匹配算法

Frequency match algorithm based on the high repetition random stepped frequency wideband radar

高重频条件下,随机频率步进(random stepped frequency,RSF)宽带雷达收发不同步导致混频困难。通过对混频过程与成像算法的分析,认为采用错误混频的回波成像时会散焦,而采用正确混频的回波能合成良好距离像。基于相邻良好距离像间有强相关性这一特征,构建了频率匹配搜索算法以获取正确的混频频率位置,并通过仿真分析验证了该方法的有效性。

Since the transceiver positions of the random stepped frequency（RSF） radar is asynchronous under the condition of the high repetition,it is difficult to mix the radar echo.Through the analysis of the mixing process and imaging algorithm,it is indicated that the imaging result with wrong fixing echo may be defocused,and the imaging result with right fixing echo can synthesize good range profile.Based on the characteristic that the good adjacent range profiles are strongly correlated,the frequency match algorithm is constructed to obtain the right fixing position.Simulation results demonstrate the validity of this method.