光子时间拉伸相干雷达中信号产生对探测性能的影响

Impacts on detection performance of signals generation in photonic time-stretched coherent radar

采用光纤结构产生线性调频信号的稳定性容易受实验器材和环境因素的影响,导致产生信号的幅相特性发生变化,进而影响到光子时间拉伸相干雷达系统的探测性能。主要分析了实验器材和环境因素对线性调频信号探测性能的影响,包括光纤耦合器分光比、滤波器中心波长偏移及干涉臂的延时扰动等因素。通过仿真不同条件下产生信号脉冲压缩后的峰值功率和距离分辨率,与理想情况下的脉冲压缩结果进行对比,得到各因素的影响情况及保证探测性能的参数范围,可以为光子时间拉伸相干雷达的设计与实现提供参考。

The stability of linear frequency modulated signals generated by optical fiber structure is easily affected by experimental devices and environmental factors,which leads to the change of amplitude and phase characteristics of the generated signal,and then affects the detection performance of photonic time-stretched coherent radar system.This paper mainly analyzes the impacts of experimental devices and environmental factors on detection performance of linear frequency modulated signals,including splitting ratio of optical couplers,center wavelength shift of the filter and delay perturbation of the interference arm.By simulating peak power and range resolution of signals after pulse compression under different conditions,comparing them with the results after pulse compression under the ideal condition,the influence of every factor and the parameter range to ensure the detection performance are obtained,which can provides a reference for design and implementation of photonic time-stretched coherent radar.