基于OFDM信号的瞬时全极化雷达技术研究

项目名称： 基于OFDM信号的瞬时全极化雷达技术研究

项目编号： No.61201386

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 电子学与信息系统

项目作者： 王宗博

作者单位： 大连理工大学

项目金额： 24万元

中文摘要： 利用目标极化信息，可提高雷达的检测、抗干扰和目标识别能力。瞬时全极化体制雷达通过双极化通道同时发射两个正交信号，可在一个脉冲重复周期内获得完整的目标极化散射矩阵。应用于瞬时全极化雷达的两个同时发射信号需满足正交条件，以消除极化散射矩阵测量中的交叉通道干扰。本项目提出设计两个正交的OFDM信号应用于瞬时全极化雷达，充分利用OFDM信号各子载波相互正交的特点，解决目前传统雷达波形由于非完全正交引起的交叉极化干扰问题。本项目以设计OFDM正交信号为需求牵引，对OFDM正交信号设计及优化方法、信号特征分析、OFDM正交信号产生和处理技术、瞬时极化散射矩阵测量算法等关键问题开展研究，提供基于OFDM信号的瞬时全极化雷达系统方案。本项目提出基于OFDM信号的瞬时全极化雷达正交波形设计、产生和处理方法，拓展了瞬时全极化雷达的波形选择空间，提高对目标极化散射矩阵的测量精度。

中文关键词： OFDM信号；MIMO雷达；正交信号产生；；

英文摘要： Polarimetric information can be used to improve the radar performance for target detection, identification and parameter estimation. Radar system with simultaneous polarimetric measurement capability transmits and receives two signals with two orthogonal polarizations; the full polarimetric backscattering matrix can be retrieve within one transmitting-receiving cycle. These two signals must be orthogonal, i.e. with cross-correlation function equals to zero, to eliminate the interference between polarimetric channels due to the simultaneous transmission and reception. This proposal will conduct research on using orthogonal frequency-division multiplexing (OFDM) signals to perform simultaneous polarimetric measurement. Following aspects will be investigated in this project: 1) Orthogonal signal pair construction principles based on OFDM signals. 2) Polarimetric scattering matrix measurement error analysis and Doppler influences analysis. 3) OFDM orthogonal signal pair real-time modulation and processing techniques. 4) Signal processing algorithms with Doppler compensation for distance-extended targets to improve the measurement accuracy. The research methodology is planned as:1) The orthogonal OFDM pair can be constructed either by interleaving mutual- orthogonal carriers in standard OFDM signal or by performing

英文关键词： OFDM Signals；MIMI Radar；Orthogonal Signals Generation；；