Journal of Xidian University

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MIMO radar waveform design via OFDM-LFM for a high speed target

LI Shengyuan1;ZHANG Xintian2;TANG Shiyang1   

  1. (1. National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071, China;
    2. Mingde College of the Northwestern Polytechnical Univ., Xi'an 710124, China)
  • Received:2017-07-14 Online:2018-06-20 Published:2018-07-18


By applying the wide transmit beam property, colocated multi-input and multi-output (MIMO) radar can save the energy loss caused by the transmit beam crossing effect of a high speed target. However, existing MIMO radar waveforms have a bad velocity tolerance ability. When the echo of the high speed target is match filtered with these waveforms, the energy loss is unneglectable. Therefore, it is necessary to design a suitable MIMO radar waveform under the high speed target condition. This paper derives the waveform based on the orthogonal frequency division multiplexing linear frequency modulation (OFDM-LFM) signal. A linear frequency modulation (LFM) signal set with frequency diversity is time division multiplex used by different channels. Hence, all waveforms are separable and share the same bandwidth. Simulation results show that the proposed MIMO radar waveform can effectively reduce the energy loss in the matched filtering process, which fits the high speed target background.

Key words: multi-input and multi-output radar, waveform design, orthogonal frequency division multiplexing linear frequency modulation (OFDM-LFM), high speed target