MIMO radar is an extension of the radar technical system,and it has multiple transmitting and receiving antennas.The multiple transmitting antennas can transmit different signals,which gave MIMO radar the advantage of waveform diversity.This advantage allowed the MIMO radar to have a higher degree of freedom in transmitting.The transmission energy coverage map can be designed flexibly according to actual working scenarios and needs.In addition,the transmission waveform can be adjusted in time based on environmental information.Therefore,MIMO radar waveform optimization design technology has become an important research topic.MIMO radar signals can be divided into two categories,namely phase-coded signals and LFM signals based on signal form.The LFM signals were more suitable for tracking and detecting high-speed targets since the phase-coded signals had poor Doppler tol-erance.The LFM signals using partially correlated waveforms had a higher energy utilization rate.However,the main lobes of the pulse synthesis results of the partially correlated waveforms designed by the traditional method were greatly broadened relative to the pulse width determined by the signal bandwidth,which seriously affected the range resolution performance of the radar during target detection.To address the problem,a partially correlated waveform design method was proposed for LFM signals based on subarray orthogonality.The proposed method im-proved freedom capability of the signals by jointly optimizing the signal bandwidth and initial phase.With the pro-posed method,the main lobes of the pulse synthesis results of the designed waveforms were basically not broad-ened,and the side-lobe peak values were low,which effectively improve the target detection capability of the ra-dar.
MIMO radarpartially correlated waveformsubarray orthogonalitywaveform design
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