匀加速目标背景下多载频LFMCW雷达信号合成方法

Multi-carrier Frequency LFMCW Radar Signal Synthesis Method Based on Uniform Acceleration Target Background

针对目标匀加速运动时的多载频LFMCW雷达信号处理问题,提出一种合成方法,进行相应的理论分析并给出其实现途径。该方法利用快时间反转变换和FRFT估计目标加速度,并通过二阶Keystone变换和分数阶频谱四阶原点矩提升估计精度,以补偿多普勒徙动;同时采用Keystone变换和相位补偿法矫正距离走动、多普勒频率和相位,以实现多载频信号的合成。仿真结果表明,当目标做匀加速运动时,该方法可有效实现多载频信号的相参合成,且具有较高的输出信噪比增益。

Aiming at the problem of multi-carrier frequency LFMCW radar signal processing when the target is moving at uniform acceleration,a synthetic method is proposed,and its realization path is given through the corresponding theoretical analysis.To compensate for Doppler migration,fast time reversal transform and FRFT are used to estimate the target acceleration,and the second-order Keystone transform and the fourth-order origin moment of fractional order spectrum are used to improve the estimation accuracy;At the same time,in order to realize the synthesis of multiple carrier frequency signals,the Keystone transform and phase compensation method are used to correct the range movement,Doppler frequency and phase.The simulation results show that the coherent synthesis of multi-carrier frequency signals is effectively realized by this method when the target moves at a uniform acceleration,and a higher output signal-to-noise ratio gain is obtained.