基于空频域MIMO波形优化的雷达通信共享系统设计

Design of Joint Radar-communication System Based on Spatial-spectral MIMO Waveform Optimization

提出了一种基于空频域波形设计的雷达通信共享系统,即对多输入多输出发射波形在空域和频域进行优化,利用优化的发射方向图主瓣实现对目标区域的雷达探测,通过控制通信方位的发射方向图旁瓣水平以及通信频带上的功率谱密度水平来实现通信信息传输。为此,在方向图旁瓣电平、波形功率谱水平、波形恒模等约束下,以发射方向图的匹配误差为目标函数,建立了相应的波形优化问题,并采用半正定松弛方法和高斯随机化方法来求解该问题。文中给出了通信信息的解调过程,且分别验证了雷达性能和通信性能。

A joint radar-communication system is proposed by spatial-spectral radar waveform design.In the proposed system,multiple-input multiple-output transmission waveforms are optimized in the spatial and spectral domains.The optimized mainlobe of the transmit beampattern is utilized to realize the radar detection in the target area,and the communication information transmission is realized by controlling the sidelobe level of the transmit beampattern at the communication angle and the power spectral density level in the communication frequency band.Therefore,under the constraints of sidelobe level,waveform power spectrum level and constant modulus of waveforms,the corresponding waveform optimization problem is established by taking the matching error of transmit beampattern as the objective function.The semidefinite relaxation method and Gaussian randomization method are utilized to solve the problem.The demodulation process of communication information is given,and the performance of radar and communication is verified respectively.