多载频MIMO雷达解速度模糊及综合处理方法

Velocity Ambiguity Resolution and Synthesis Processing in Multi-frequency MIMO Radar

多载频MIMO雷达采用稀布阵发射多载频FMCW信号,阵列接收目标回波。该文分析了多载频MIMO雷达的信号模型,提出了一种解速度模糊的新方法,该方法不需发射多重频信号,利用各发射通道模糊多普勒频率获得目标真实速度的最小二乘解。还提出了一种新的发射接收综合处理方法,该方法将积累后每个距离单元等分成Nn份,并用相参积累结果对其加权,在抑制距离栅瓣的同时充分利用了收发阵列孔径。最后讨论了多载频MIMO雷达的参数选取问题。仿真结果表明了该文方法的有效性。

The multi-frequency MIMO radar uses sparse-array to transmit the FMCW signals of multiple carrier frequencies, and an array to receive the echoes. The signal model of multi-frequency MIMO radar is analyzed in this paper. A new method is proposed to resolve velocity ambiguity, using which the least squared estimation of real velocity can be obtained from the ambiguous Doppler shifts corresponding to the different transmit frequencies without transmitting multiple PRF（Pulse Repetition Frequency） signals. Another method for synthetic impulse and aperture processing is presented in this paper. Every range cell after coherent integration is divided equally into N parts, which is weighted by the coherent integration results. As a result, the range grating lobes are suppressed greatly and the aperture of transmitting and receiving array is utilized adequately. Finaly, the problem how to choose the system parameters is discussed. The simulation results indicate the validity of the method presented in this paper.