Blind velocities mitigation for MIMO GMTI radar with Doppler division multiple access waveforms |
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| Affiliation: | 1. School of Electronic Science and Engineering, National University of Defense Technology, De Ya Road, Changsha 410073, China;2. China Academy of Electronics and Information Technology, China Electronics Technology Group Corporation (CETC), Beijing 100846, China;1. National Research Center of Railway Safety Assessment, Beijing Jiaotong University, Beijing 100044, China;2. State Key Lab of Rail Traffic Control & Safety, Beijing Jiaotong University, Beijing 100044, China;1. The 29th Research Institute of China Electronics Technology Group Corporation, Chengdu, China;2. China Internet Network Information Centre, Beijing, China;3. Key Laboratory of Information Coding and Transmission, Southwest Jiaotong University, Chengdu, China;4. Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing, China |
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| Abstract: | Multiple-input multiple-output (MIMO) radar with multiple transmitters and multiple receivers can achieve a larger virtual antenna array and more system degrees of freedom; thus applying it to ground moving target indication (GMTI) radar can improve the performance of GMTI. Doppler division multiple access (DDMA) waveforms are approximately orthogonal providing good minimum detectable velocity (MDV) performance. However, in such DDMA systems, a sufficient pulse repetition frequency (PRF) design freedom is required. Furthermore, these waveforms suffer from blind velocities which are serious problems, especially in radar systems with high carrier frequency or low PRF. This paper analyses the blind velocities problem and show that blind velocities are relative to variation of the PRF and/or the carrier frequency. Variable PRF techniques are widely used in conventional GMTI radar including multiple PRFs and variable pulse repetition intervals (PRI). Combined with the characteristics of the DDMA MIMO GMTI radar, this paper proposed two methods to mitigate blind velocities: “multi-PRF DDMA” which employs multiple PRFs over successive coherent processing intervals, and “PRI-dithered DDMA” which employs nonuniform sampling by dithered PRI in slow time. Simulation results demonstrate that both the methods are effective ways to mitigate blind velocities in DDMA MIMO GMTI radar systems. |
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| Keywords: | Blind velocities mitigation DDMA MIMO GMTI radar Multi-PRF DDMA PRI-dithered DDMA |
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