Joint Design of OFDM-LFM Waveforms and Receive Filter for MIMO Radar in Spatial Heterogeneous Clutter

This letter proposes a method of jointly designing orthogonal frequency division multiplexing (OFDM)-LFM waveforms and receive filter in spatial heterogeneous clutter. Different from the previous indirect method that first solves the optimal spectra and then optimizes the waveform parameters to approximate the spectra, this letter proposes a cyclic algorithm based on iterative sequence optimization (ISO), which can directly optimize multiple groups of subchirp durations of the OFDM-LFM waveforms, so as to improve the output SCNR. Finally, numerical results are provided to assess the proposed method. Results indicate that the waveforms optimized by the proposed method can simultaneously suppress clutter in both spatial azimuth and frequency domains. Moreover, compared with the indirect optimization method, the method that only optimizes the transmitting waveforms and the single-group subchirp durations optimization method, the proposed method has higher output SCNR.