基于新循环算法的多相编码波形优化

Polyphase Coded Waveform Optimization Based on Cyclic Algorithm-new Method

针对多相编码存在旁瓣峰值过高,会造成弱目标检测丢失的问题,提出了基于新循环算法(CAN,Cyclic algorithm-new)的多相编码波形优化方法。该方法以积累旁瓣水平与品质因数作为波形峰值旁瓣的衡量指标,将峰值旁瓣水平的最小化等价为一个频域最小化问题,进而转化为一个二次函数的最小化问题。数值仿真表明,采用CAN方法能有效降低多相编码信号的旁瓣峰值与积累旁瓣水平,提高多相编码信号的品质因数以及微弱目标的分辨能力。

Polyphase pulse has high peak sidelobe that will cause the loss of weak target detection.To solve this problem（especially P4 codes in this paper）,apolyphase coded waveform optimization method was proposed based on CAN（Cyclic algorith-new）method.This method used the integrated sidelobe level and merit factor to evaluate the peak sidelobe.The minimizing peak sidelobe level was equivalent to a frequency domain minimization problem.Finally,it converted to a quadratic function minimization problem.Numerical simulation showed that the proposed method could reduce the intergrated sidelobe level and peak sidelobe of polyphase coded signal effectively,meanwhile,it improved the merit factor and detection ability of weak target detection.