基于系统辨识的干扰对消技术研究

摘要

Transmitter-receiver isolation is forever a key technique of electronic warfare (EW) system.The jamming signals radiated by the transmitter are probably coupled into the reconnaissance receiver without enough isolation,which makes the receiver operate abnormally even generate self-excited phenomenon.This paper analyzes the advantages and disadvantage of conventional techniques of transmitter-receiver isolation improvement and adaptive jamming canceling,presents a novel jamming canceling method based on system identification,utilizes the linear time invariance of jamming coupling channel to fit the transmission function of jamming coupling channel.The simulation and experiment results indicate that the proposed method can cancel various jamming signals,at the same time preserve the received radar signals,and can satisfy the isolation requirements of EW system.%收发隔离度一直是电子战系统的关键技术,若隔离度不够,发射的干扰信号会耦合到侦察接收机,使接收机不能正常工作甚至产生自激.分析了传统收发隔离改善技术和自适应干扰对消技术的优缺点,提出了基于系统辨识的干扰对消方法,利用耦合通路的线性非时变性,拟合出干扰耦合通路的传递函数.仿真和实验结果表明,该方法能有效对消各种干扰信号,同时不会影响接收的雷达信号,能够满足系统隔离度的要求.