基于编码序列随机移位的MCPC雷达信号设计方法研究

摘要

Multi-Carrier Phase-Godenal Signal (MCPC) has caught much attention of researchers recently. The flexible structure enables its and adjustable performance,while enhancing the demand of parameter designing.Current designig methods can hardly achieve satisfied ambiguity diagram and envelope control simultaneity, and they mostly perform the rehash with less sub carries.This research proposed a random ahifted a random shifted phase-coded MCPC,signal,whose ambiguity diagram is ideal thumbtack shaped.To deal whith its fluctuating envelope time-frequency clipping iteration was brought forward,after which optimizing method was used to further reduce the side lobes of auto cross functiom (ACF). Simulation results shoe that the designed signal keeps ideal ambiguity diagram and low PMEPR at the same time,while maintaining good ACF on sub carriers. Compared with reported MCPC at present,this signalis more suitable for practocal use is radar.%多载频相位编码信号(MCPC)是近年来备受关注的一种新体制宽带雷达信号,其灵活的信号结构使其具备性能均衡、可调的特点,与此同时对参数设计的要求也相应提高.现有设计方法难以在模糊图和包络控制方面同时取得令人满意的性能,且大多只研究了载频数量较少的情况.针对此问题提出了一种编码序列随机移位的MCPC信号,具备理想的图钉状模糊图.针对这种信号包络起伏较大的问题,采用时频域限幅迭代方法降低其包络峰均功率比;迭代后进一步通过优化方法降低自相关旁瓣水平.仿真实验表明,经迭代优化后的信号同时具有理想的模糊图和包络峰均比,子载频上的自相关性能也保持良好,相比现有的MCPC信号更适于雷达实际应用的需求.