可调谐激光器的光束特性对合成孔径激光雷达成像质量的影响研究

项目名称： 可调谐激光器的光束特性对合成孔径激光雷达成像质量的影响研究

项目编号： No.61505036

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 无线电电子学、电信技术

项目作者： 张艳

作者单位： 贵阳学院

项目金额： 20万元

中文摘要： 合成孔径激光雷达是合成孔径雷达在光学波段的拓展，是现阶段能够对上千公里目标实现厘米量级分辨率的唯一光学遥感手段，在航空、航天、环镜监测等领域有着巨大的应用价值。为了获得大信号带宽、实现高分辨率探测成像，合成孔径激光雷达常采用可调谐激光器作为光源。在宽带调谐过程中，激光器的光束特性将成为影响合成孔径激光雷达成像质量不可忽视的因素。本项目拟针对周期性调谐过程中可调谐激光器的输出光束特性对合成孔径激光雷达成像质量的影响机理进行深入研究。采用模拟分析和实验验证的方法，通过优化光束模型、降低输出信号相位误差等因素对成像质量的影响，获得高峰值旁瓣比的点目标响应，从而提高合成孔径激光雷达的成像质量。同时，利用Zemax软件设计光学带通滤波器从而实现对可调谐激光器输出光束的优化，降低波长重复度对成像质量的影响，提高合成孔径激光雷达系统的稳定性、抗冲击性、安全性，为合成孔径激光雷达系统走向实用化提供参考。

中文关键词： 可调谐激光器；合成孔径激光雷达；分辨率；相位误差；波长定标

英文摘要： Synthetic aperture ladar (SAL), which applies synthetic aperture radar (SAR) techniques in the optical laser radar domain, can theoretically provide centimeter-class resolution with a small-diameter optical aperture in 1000 km, thus it has great potential in such field of military and civil applications as aviation, aerospace and everiment monitoring. To obtain high signal bandwidth and realize high resolution image , a tunable laser is often used in synthetic aperture ladar as the light source. During the broadband tuning process, the beam properties will become the factors that can not be ignored for that affect the imaging quality of synthetic aperture ladar. This research presents an in-depth study on the influence of beam property on the imaging quality of synthetic aperture ladar with the heterodyne detection system. By means of simulation analysis and experiment,such measures can be used to improve the imaging quality of synthetic aperture ladar as optimizating of beam model, reducing the output signal phase error and raising the peak sidelobe ratio of point target response.At the same time, the influence of wavelength repeat in tunable laser can be reduced on image quality by designing optical bandpass filtering with Zemax software . The meaabove-mentioned measures can improve synthetic aperture ladar system stability, impact resistance, safety. The research result may provide a reference for the synthetic aperture ladar system in reality.

英文关键词： tunable laser;synthetic aperture ladar;resolution;phase error;wavelength calibration