1 550 nm相干激光测风雷达微弱回波信号处理

李宝林; 杨冬; 王露; 张毅; 申向伟; 曾祥豹; 王音心

doi:doi:10.11977/j.issn.1004-2474.2022.02.036

压电与声光, 2022, 44 (2): 333, 网络出版: 2022-06-14

1 550 nm相干激光测风雷达微弱回波信号处理

Weak Echo Signal Processing of 1 550 nm Coherent Laser Wind Radar

论文大纲

李宝林杨冬王露张毅申向伟曾祥豹王音心

作者单位

中电科技集团重庆声光电有限公司，重庆 401332

激光测风雷达相干回波输入功率多普勒频移频谱累计 coherent laser wind lidar coherent echo signal input power Doppler frequency shift spectrum accumulation

摘要

针对激光测风雷达回波信号极其微弱，直接快速傅里叶变换(FFT)后无法得到回波信号频域幅值的问题，该文提出了嵌入现场可编程门阵列(FPGA)的数字中频信号处理方法，有效地提取了回波信号频域幅值。激光测风雷达的回波信号是相干激光脉冲信号经过空气中气溶胶后向散射的信号，由于空气中气溶胶浓度小以及激光发射功率限制，回波信号微弱，首先将模拟回波信号经过中频放大器进行信号放大，再进入模数转换器(ADC)采样，然后采用补零FFT和FFT频谱累积等数字中频信号处理方法，提高微弱回波信号的信噪比，从而有效识别了回波信号中含有风速信息的频域幅值。结果表明，经过试验可得2 km内稳定的风速，精度可达0, 1 m/s。

Abstract

Aiming at the problem that the echo of coherent laser wind lidar is very weak and the frequency domain amplitude of the echo cannot be obtained after direct fast Fourier transform(FFT), a digital intermediate frequency signal processing method embedded in field programmable gate array(FPGA) is proposed to effectively extract the frequency domain amplitude of the echo, The echo of laser wind lidar is the backscattered signal of coherent laser pulse through aerosol in the air, Due to the small aerosol concentration in the air and the limitation of laser emission power, the echo is extremely weak, Firstly, the analog signal of echo is amplified through the intermediate frequency(IF) amplifier, and then enters the analog-to-digital converter(ADC) for sampling, Then digital IF signal processing methods such as zero padding FFT and FFT spectrum accumulation are used to improve the signal-to-noise ratio of weak echo, so as to effectively identify the frequency domain amplitude of wind speed information in echo, Through the test, the stable wind speed within 2 km is obtained, and the accuracy is 0, 1 m/s,

参考文献

[1] ISHIIS,SATO A,AOKI M,et al, Recent research and development of 2 μm laser for future space-based Doppler wind lidar in Japan［C］// Pacifico Yokohama,Japan: IEEE International Geoscience and Remote Sensing Symposium,2019,

[2] SAMEH A,DAVID S,AREND F M,et al, Development and operational analysis of an all-fiber coherent Doppler lidar system for wind sensing and aerosol profiling[J]. IEEE Transactions on Geoscience and Remote Sensing,2015,53(12): 6495-6506,

[3] BANZHAF S,WALDSCHMIDT C, Phase-code-based modulation for coherent lidar[J]. IEEE Transactions on Vehicular Technology,2021,70(10): 9886-9897,

[4] TANG Zheng,WANG Mengfan,FENG Wei,et al, Source location and suppression of phase induced intensity noise in fiber-based continuous-wave coherent Doppler lidar[J]. IEEE Photonics Journal，2021,13(3):1-10,

[5] 张小曳, 中国不同区域大气气溶胶化学成分浓度、组成与来源特征[J]. 气象学报，2014,72(6): 1108-1117,

[6] XIAO Tianwen, XU Yongneng,YU Huimin, Research on obstacle detection method of urban rail transit based on multisensor technology[J]. Journal of Artificial Intelligence and Technology,2021,1(1):61-67,

[7] 施端阳,林强,胡冰，等, 基于改进BP神经网络的雷达剩余杂波抑制方法[J]. 兵器装备工程学报，2021，42(10): 79-85,

[8] 周永升, 相干多普勒测风激光雷达关键技术研究[D]. 北京:中国航天科技集团公司，2017,

[9] 范东倩, 激光测风雷达脉冲相干累加技术的实验研究[D]. 哈尔滨: 哈尔滨工程大学，2015,

[10] 王冲, 1, 5 mm波长全光纤多功能相干多普勒测风激光雷达[D]. 合肥:中国科学技术大学，2019,

[11] 贾晓东, 1, 55 μm相干测风激光雷达样机的研制[D]. 合肥: 中国科学技术大学，2015,

李宝林, 杨冬, 王露, 张毅, 申向伟, 曾祥豹, 王音心. 1 550 nm相干激光测风雷达微弱回波信号处理[J]. 压电与声光, 2022, 44(2): 333. LI Baolin, YANG Dong, WANG Lu, ZHANG Yi, SHEN Xiangwei, ZENG Xiangbao, WANG Yinxin. Weak Echo Signal Processing of 1 550 nm Coherent Laser Wind Radar[J]. Piezoelectrics & Acoustooptics, 2022, 44(2): 333.

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