杂波环境下共享频谱恒模波形设计

Design of Unimodular Waveform for Spectrum Sharing in Clutter Environment

针对射频频谱环境愈发拥挤问题,深入研究了通过波形设计的手段实现频谱共享的问题。为紧密贴近工程实践,提出了一种新的方法设计恒定幅度信号的问题。该算法首先针对雷达发射端,提出雷达波形满足特定的时域与频谱要求,施加约束,然后考虑雷达接收滤波器接收杂波,以优化最大信干噪比建立优化问题模型,得到了一个非凸的分式规划问题模型。最后,利用分步优化方法分解为两个优化问题,并且将非凸问题松弛为可解的凸问题再利用高斯随机化方法得到优化信号,多次循环优化。仿真结果验证了该算法的有效性,该方法设计的探测信号能够实现频谱共存,而且信干噪比性能能够得到保证。

In order to solve the problem of increasing congestion in RF spectrum environment,the problem of spectrum sharing by means of waveform design is deeply studied.In order to be close to engineering practice,a new method for designing constant amplitude signal is proposed.Firstly,aiming at the radar transmitter,the radar waveform meets the specific time domain and spectrum requirements and imposes constraints,and then the radar receiving filter is considered to receive the clutter.therefore,the optimization problem model is established to optimize the maximum Signal to Interference plus Noise Ratio(SINR).In this paper,a nonconvex fractional programming problem model is obtained.In this paper,a nonconvex fractional programming problem model is obtained.Finally,the step-by-step optimization method is used to decompose the problem into two optimization problems,and the nonconvex problem is relaxed to solvable convex problem.Then Gauss randomization method is used to obtain the optimal signal and multiple cyclic optimization.The simulation results verify the effectiveness of the algorithm.The detection signals designed by the method can coexist in the spectrum,and the SINR performance can be guaranteed.