机载电子战装备的收发隔离度是制约作战效能发挥的重要因素,若隔离度不够,发射的干扰信号会耦合到接收机端口,使接收机输出错误结果甚至堵塞接收机。文中分析了自适应干扰对消技术的原理,在对消参考信号中包含有用的雷达信号时,推导出干扰对消比和信号损失比的表达式,仿真分析了典型电子战吊舱满足收发同时工作所需的信号延时精度和延时范围。针对高精度延时需求,提出了基于光微环的可编程延时模块。实验表明:使用光纤延时模块组建干扰对消系统,具有对消比高、瞬时带宽宽、收敛速度快的特点。

Transmitter-receiver isolation is an important factor for restriction of battle efficiency in airborne electronic warfare (EW). Without enough isolation, the jamming signals radiated by the transmitter will probably be coupled into the receiver, which makes the receiver abnormal or self-excited. The principle of adaptive jamming cancelling is analyzed. During the cancellation of referring signals involving usable radar signals, the expressions of interference cancellation ratio and signal loss ratio are induced, and signal delay accuracy and range for typical airborne EW pod to meet the simultaneous work of receiver and transmitter are simulated and analyzed. Aiming at high precision delay requirement, programmable delay modules based on optical fiber micro-ring are proposed. The experiment demonstrates that the interference cancellation system constructed with optical fiber delay modules has the characteristics of high cancellation ratio, wide instantaneous bandwidth, and rapid convergence velocity.

TN972