Abstract：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 Nn 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.
2009, Vol. 31 
