一种扫频干涉激光测距系统的标定方法  

Calibration Method of Frequency Scanning Interferometry Laser Ranging System

作　　者：闫语畅 薛蔺洋 陈潇洒 陈桂林[1] 韩昌佩[1] Yan Yuchang;Xue Linyang;Chen Xiaosa;Chen Guilin;Han Changpei(Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海技术物理研究所,上海200083 [2]中国科学院大学,北京100049

出　　处：《光学学报》2024年第14期103-111,共9页Acta Optica Sinica

基　　金：中国科学院上海技术物理研究所创新基金(CX-316)。

摘　　要：针对扫频干涉激光测距系统的标定问题,首先建立扫频干涉的数学物理模型,对测距原理进行推导;然后针对激光频率漂移导致系统误差的问题,提出通过改变扫描镜角度并利用基准尺对系统参数进行标定的方法;之后研究激光器扫频非线性误差数学物理模型,提出线性电流调制和信号处理算法对扫频特性进行标定,再构造电流调制函数对扫频非线性进行校正,仿真分析并对其进行验证;最后搭建相关实验平台,对两种标定校正方法分别进行实验,验证所提方法的有效性。在不额外增加光学器件或高精度仪器的情况下,所提标定方法可以实现扫频干涉激光测距系统的参数标定和校正,对在地面测试和在轨部署应用的测距系统保持长期稳定工作具有实际工程价值。Objective In the Fengyun-4 microwave detection satellite mission, a frequency scanning interferometry(FSI) LiDAR was used to conduct real-time, high-precision measurements of the satellite's microwave antenna surface profile. This enabled on-orbit adaptive antenna adjustment, ensuring normal operation of the satellite's payloads. The LiDAR system includes an FSI laser ranging component and a two-dimensional scanning mirror. The precision of the laser ranging system is crucial as it directly influences the accuracy of the antenna surface profile measurements, which in turn impacts the satellite's overall performance.The laser ranging system uses a distributed feedback(DFB) laser, which modulates the drive current to produce a laser frequency scanning output. However, the output characteristics of DFB lasers tend to degrade with increasing operational duration, particularly under the harsh conditions of geostationary orbit. This degradation can cause a drift in the laser's frequency scanning characteristics curve, leading to anomalies in the FSI laser ranging system. Consequently, the nonlinearity of the laser frequency scanning should be periodically calibrated and corrected to ensure optimal function of the FSI laser ranging system. Currently, these nonlinearity issues are addressed by iteratively changing the current and using optoelectronic phase-locked loops for active correction. Given the constraints imposed by the harsh space environment,which limits the use of high-performance processors and complex circuits, there is a pressing need for a calibration and correction method that consumes minimal computational resources.Optical fibers, which are primarily used in the FSI laser ranging system to construct internal optical paths, introduce length errors during the fabrication process. Additionally, factors such as temperature changes and laser frequency variations can alter the equivalent optical path length of the fibers, introducing measurement errors. Therefore, periodic calibration of the fiber length or s

关 键 词：测量 扫频干涉 激光测距 分布式反馈激光器 系统标定 非线性校正 风云四号 

分 类 号：TN958.98[电子电信—信号与信息处理] TN959.6[电子电信—信息与通信工程]