针对多载频线性调频连续波(LFMCW)雷达信号级合成处理困难的问题,提出一种Keystone变换与互相关相结合的合成处理新方法。该方法基于多载频LFMCW 慢时间维信号特征,经过Keystone 变换对信号重采样实现多普勒频率补偿,利用互相关获得相位差的方法补偿相位,从而在慢时间维上完成了多载频LFMCW 雷达信号的相参合成处理。仿真结果表明了所提新方法的有效性和高增益性,即使是对输入信噪比为-31dB的差拍信号仍可保证较高的输出信噪比增益,为多载频雷达信号的合成处理提供一种新的思路。

A new synthesis processing method combining Keystone transform and cross-correlation is proposed to solve the difficult problem of multi-carrier frequency LFMCW radar signal level synthesis processing. This method is based on the characteristics of the slow-time dimensional signal of the multi-carrier frequency LFMCW, the Doppler frequency is compensated by using the Keystone transform to resample the signal; further, the phase difference is compensated by using the cross-correlation method to obtain the phase difference, thus, the coherent synthesis processing of multi-carrier frequency LFMCW radar signal is completed in the slow time dimension. Simulation results are presented to show the effectiveness and high gain of the method, and even for multiple beat signals with an input signal-to-noise ratio of -30 dB, a higher output signal-to-noise ratio gain can still be guaranteed. Therefore,a new idea is provided for multi-carrier signal synthesis processing.

TN957. 51

国家自然科学基金资助项目(61601496);河北省自然科学基金资助项目(F2019506037)