用于雷达回波仿真的小型化微波光纤延迟线

发布时间：2018-03-05 09:40

  本文选题：雷达回波仿真　切入点：光纤延迟线　出处：《光学精密工程》2017年05期 　论文类型：期刊论文

【摘要】：针对高分辨率雷达回波信号仿真对带宽、线性度和延时性能的要求,设计了X波段雷达测试与校准应用的小型化微波光纤延迟线。分析了雷达回波模拟源对距离延迟单元的性能要求,根据系统指标,研制了用于宽带雷达信号线性电光转换的关键器件—直接调制分布反馈(DFB)激光器。基于光纤反射镜,设计与实现了一种小型化的反射式延迟线结构。最后,利用矢量网络分析仪对系统的微波传输性能进行了测试分析。结果表明:直接调制DFB激光器的-3dB模拟调制带宽高达21GHz。基于该激光器的微波光纤延迟线,针对X波段雷达测试应用可提供40、80、120μs不同延时的目标回波模拟,其带内幅度平坦度小于±0.5dB,相位非线性小于10°,同时线性动态范围大于60dB,满足雷达回波仿真与校准过程对于信号附加幅频误差和相频误差的要求。
[Abstract]:Aiming at the requirement of bandwidth, linearity and delay performance for high resolution radar echo signal simulation, A miniaturized microwave fiber delay line for the testing and calibration of X-band radar is designed. The performance requirements of the radar echo analog source for the range delay unit are analyzed. A key device for linear electro-optic conversion of wideband radar signals, a direct-modulated distributed feedback DFB laser, is developed. Based on the fiber mirror, a miniaturized reflective delay line structure is designed and implemented. The microwave transmission performance of the system is tested and analyzed by using a vector network analyzer. The results show that the analog modulation bandwidth of the direct-modulated DFB laser is up to 21 GHz. In view of X-band radar test application, target echo simulation with different time delay of 40 ~ 80 渭 s and 120 渭 s can be provided. The in-band amplitude flatness is less than 卤0.5 dB, the phase nonlinearity is less than 10 掳, and the linear dynamic range is more than 60 dB, which meets the requirements of radar echo simulation and calibration for the additional amplitude frequency error and phase frequency error.
【作者单位】： 中国科学院半导体研究所集成光电子学国家重点实验室;
【基金】：国家自然科学基金资助项目(No.60902067) 吉林省重大科技攻关项目(No.11ZDGG001)
【分类号】：TN253;TN957.51
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