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相干测风激光雷达带通采样方法的仿真研究
引用本文:张寅超,李丽丽,郭磐,陈思颖,陈和,芮训豹,纪红柱. 相干测风激光雷达带通采样方法的仿真研究[J]. 北京理工大学学报, 2018, 38(2): 211-215. DOI: 10.15918/j.tbit1001-0645.2018.02.018
作者姓名:张寅超  李丽丽  郭磐  陈思颖  陈和  芮训豹  纪红柱
作者单位:北京理工大学光电学院,北京,100081;北京理工大学光电学院,北京,100081;北京理工大学光电学院,北京,100081;北京理工大学光电学院,北京,100081;北京理工大学光电学院,北京,100081;北京理工大学光电学院,北京,100081;北京理工大学光电学院,北京,100081
基金项目:国家自然科学基金资助项目(61505009)
摘    要:根据相干测风雷达回波信号载频高、带宽窄的特点,尤其星载相干测风雷达回波信号数千兆赫兹,采用传统采样方式对采集卡的采样率要求很高.鉴于采集卡的采样率和分辨力互相制约,提出将带通采样引入到相干测风雷达系统.本文以1.5 μm全光纤相干测风激光雷达的实测数据作为仿真输入,经Simulink滤波、带通采样,结果表明,在对探测距离影响不大的情况下,与低通采样方式相比径向风速反演结果最大相差0.5 μm/s;数据处理的时间复杂度降低,其下降值是带通采样频率与低通采样频率的比值;但信噪比会恶化,其下降值介于1~3 dB. 

关 键 词:遥感  相干探测  模拟带通滤波器  带通采样  信号处理
收稿时间:2016-09-18

Simulation Research on Coherent Wind Lidar Bandpass Sampling Method
ZHANG Yin-chao,LI Li-li,GUO Pan,CHEN Si-ying,CHEN He,RUI Xun-bao and JI Hong-zhu. Simulation Research on Coherent Wind Lidar Bandpass Sampling Method[J]. Journal of Beijing Institute of Technology(Natural Science Edition), 2018, 38(2): 211-215. DOI: 10.15918/j.tbit1001-0645.2018.02.018
Authors:ZHANG Yin-chao  LI Li-li  GUO Pan  CHEN Si-ying  CHEN He  RUI Xun-bao  JI Hong-zhu
Affiliation:School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China
Abstract:A band-pass sampling method was introduced for the coherent wind radar system to solve the problems in the echo signal sampling,including the high carrier frequency,narrow bandwidth,especially several GHz echo signal of the spaceborne wind coherent radar,high sampling rate of acquisition card required with the traditional sampling method,the mutual constraints of sampling rate and resolution of acquisition card.In this paper,a simulation test was carried out,taking the acquisition data collected from 1.5 tμm all-fiber coherent Doppler lidar system as the input information to do Simulink filter and band-pass sampling.Results show that,compared with the low-pass sampling,the maximum difference of sight speed inversion is about 0.5 m/s when the change of detection distance is not large;furthermore,the time complexity of data processing is decreased,and its value is the ratio of bandpass sampling frequency and low pass sampling frequency.However,the ratio of signal to noise deteriorates,the value of which is about 1~3 dB.
Keywords:remote sensing  coherent exploration  simulated band-pass filter  band-pass sampling  signal processing
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