摘要
为提高激光跟踪精确度,采用相位法改进激光跟踪系统,发射机采用正弦信号调制激光功率,接收电路采用四象限雪崩光电二极管(APD)检测激光回波,通过快速傅里叶变换(FFT)计算失调角,稳定平台保持视轴稳定,并根据失调角跟踪目标。失调角误差是跟踪误差的主要因素之一,与信噪比和数据长度成反比,系统通过滤波、高速采样提高测量精确度。仿真时载体扰动幅度为5°,信噪比为0 d B,干扰信号为目标信号的100倍,系统能准确识别目标,跟踪误差为0.033°,表明基于相位法的跟踪系统具有多目标、高精确度跟踪能力。
In order to improve the tracking precision,a new laser tracking system is designed with phase-shift measurement.Laser power of transmitter is modulated by sinusoidal signals.A four quadrant detector is utilized to detect the laser echoes in receiving circuits.Missing angles are calculated through Fast Fourier Transform(FFT),and the measurement errors are inversely proportional to SNR and data length.The stabilized platform holds the optical axis and tracks the target according to the missing angles.Errors of missing angles have great effect on the tracking accuracy.Filters and high speed sampling circuits are designed to reduce errors.When the perturbation amplitude is 5°,the SNR is 0 dB,jamming signals are 100 times that of real signal,system can accurately identify the target,and the tracking error is 0.033°.Simulation results prove that the phase-shift laser tracking system can track multiple targets with high accuracy.
作者
王选钢
左丹
张瑶
侯贵双
冯新华
岳立
WANG Xuangang;ZUO Dan;ZHANG Yao;HOU Guishuang;FENG Xinhua;YUE Li(Chengdu Aerospace Communications Device Company Limited,Chengdu Sichuan 610051,China)
出处
《太赫兹科学与电子信息学报》
北大核心
2018年第1期71-74,80,共5页
Journal of Terahertz Science and Electronic Information Technology
基金
四川省科技厅应用基础研究面上项目(2017JY0092)
关键词
激光跟踪
相位法激光测量
四象限探测器
视轴稳定
快速傅里叶变换
laser tracking
phase-shift laser measurement
four quadrant detector
optical axis stabilization
Fast Fourier Transform
