基于子阵正交的MIMO雷达LFM信号部分相关波形设计方法  

A Partially Correlated Waveform Design Method for MIMO Radar LFM Signals Based on Subarray Orthogonality

作　　者：池政刚 党腾飞 王伟[1] 于贵龙[1] CHI Zhenggang;DANG Tengfei;WANG Wei;YU Guilong(Xi'an Electronic Engineering Research Institute,Xi'an 710010)

机构地区：[1]西安电子工程研究所,西安710100

出　　处：《火控雷达技术》2024年第3期39-43,共5页Fire Control Radar Technology

摘　　要：MIMO雷达是雷达体制的一种扩展,具有多个发射和接收天线,各发射天线可以发射不同信号,这使得MIMO雷达具有波形分集的优势。MIMO雷达的波形分集优势,使得雷达系统具有更高的发射自由度,可以针对不同的工作场景和需求,灵活地设计发射能量覆盖图,也可以根据环境信息及时调整发射波形。因此,MIMO雷达波形优化设计技术是一个重要的研究领域。根据信号形式的不同可以分为相位编码信号和LFM信号两大类,由于相位编码信号的多普勒容忍性较差,LFM信号更适合用于高速目标的跟踪与检测。其中基于LFM信号的部分相关波形具有更高的能量利用率,但传统方法设计得到部分相关波形的脉冲综合结果的主瓣相对于信号带宽决定的脉冲宽度有较大展宽,在目标检测时会严重影响目标的距离分辨性能。针对这一问题,本文提出了一种基于子阵正交的LFM信号部分相关波形设计方法。该方法通过对信号带宽和初相的联合优化,提高了信号的自由度,设计得到波形的脉冲综合结果的主瓣基本没有展宽,且旁瓣峰值较低,有效地提高了雷达对于目标的检测能力。MIMO radar is an extension of the radar technical system,and it has multiple transmitting and receiving antennas.The multiple transmitting antennas can transmit different signals,which gave MIMO radar the advantage of waveform diversity.This advantage allowed the MIMO radar to have a higher degree of freedom in transmitting.The transmission energy coverage map can be designed flexibly according to actual working scenarios and needs.In addition,the transmission waveform can be adjusted in time based on environmental information.Therefore,MIMO radar waveform optimization design technology has become an important research topic.MIMO radar signals can be divided into two categories,namely phase-coded signals and LFM signals based on signal form.The LFM signals were more suitable for tracking and detecting high-speed targets since the phase-coded signals had poor Doppler tolerance.The LFM signals using partially correlated waveforms had a higher energy utilization rate.However,the main lobes of the pulse synthesis results of the partially correlated waveforms designed by the traditional method were greatly broadened relative to the pulse width determined by the signal bandwidth,which seriously affected the range resolution performance of the radar during target detection.To address the problem,a partially correlated waveform design method was proposed for LFM signals based on subarray orthogonality.The proposed method improved freedom capability of the signals by jointly optimizing the signal bandwidth and initial phase.With the proposed method,the main lobes of the pulse synthesis results of the designed waveforms were basically not broadened,and the side-lobe peak values were low,which effectively improve the target detection capability of the radar.

关 键 词：MIMO雷达 部分相关波形 子阵正交 波形设计 

分 类 号：TN958[电子电信—信号与信息处理]