MIMO Radar Orthogonal Waveform Set Design Based on Chirp Durations
LI Hui① ZHAO Yongbo①② CHENG Zengfei①
①(National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China) ②(Collaborative Innovation Center of Information Sensing and Understanding, Xidian University, Xi’an 710071, China)
Abstract：Due to the large time-bandwidth product, Linear Frequency Modulation (LFM) signals are widely used, and their diversity can be applied to orthogonal waveform set design for MIMO radar. To solve the problems of the correlation functions of the existing waveforms, detailed analysis is made, a new waveform based on chirp durations is proposed, and the orthogonal waveform set design method is given subsequently. Peak sidelobe level is calculated for the cost function, the chirp durations of subpulses are optimized by Sequential Quadratic Programming (SQP). Simulation results show that the designed waveforms have lower autocorrelation sidelobe level and crosscorrelation level compared with the present method. In addition, relationships among autocorrelation sidelobe level, crosscorrelation level and the size of orthogonal waveforms are studied via numerical experiments.
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