Adaptive Matched Filtering Algorithm for High-Precision Laser Bathymetry

HU Si-qi; OUYANG Yong-zhong; LIU Hui-jie; ZHU Ye; ZHAO Ling-feng; DONG Chao

doi:10.13203/j.whugis20200402

Volume 46 Issue 9

Sep. 2021

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Geomatics and Information Science of Wuhan University > 2021 > 46(9): 1395-1403. > DOI: 10.13203/j.whugis20200402

HU Si-qi, OUYANG Yong-zhong, LIU Hui-jie, ZHU Ye, ZHAO Ling-feng, DONG Chao. Adaptive Matched Filtering Algorithm for High-Precision Laser Bathymetry[J]. Geomatics and Information Science of Wuhan University, 2021, 46(9): 1395-1403. DOI: 10.13203/j.whugis20200402

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Adaptive Matched Filtering Algorithm for High-Precision Laser Bathymetry

HU Si-qi^{1, 2,},
OUYANG Yong-zhong^{3, 4},
LIU Hui-jie^{1, 2},
ZHU Ye^{1, 2},
ZHAO Ling-feng^{1, 2},
DONG Chao^{3, 4}

1.
Innovation Academy for Microsatellites, Chinese Academy of Sciences, Shanghai 201203, China
2.
Shanghai Engineering Center for Microsatellites, Shanghai 201203, China
3.
Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou 510300, China
4.
South China Sea Marine Survey and Technology Center, State Oceanic Administration, Guangzhou 510300, China

Funds:

The National Natural Science Foundation of China 41774021

the Strategic Priority Research Program of the Chinese Academy of Sciences XDA15020400

Shanghai Municipal Science and Technology Major Project 2019SHZDZX01

More Information

Author Bio:
HU Si-qi: HU Siqi, PhD, assistant researcher, specializes in free space laser communication. E-mail: siqi.hu@outlook.com
Received Date: December 23, 2020
Published Date: September 17, 2021

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Abstract

Abstract

Objectives The airborne laser bathymetry system transmitted laser pulse through the complex channel which consisted of atmosphere, air-sea interface and water channel. The signal power decreased exponential with the increment of the water depth, and the pulse waveform was stretched and distorted at the same time. These two types of transmission characteristics would limit the maximum detection depth and the measurement accuracy of depth, respectively.
Methods The purpose of the proposed algorithm is to improve the measurement accuracy of laser bathymetry system on the premise of ensuring the maximum detection depth performance. First, the water quality and Monte Carlo simulation method are used to study the different depth of echo signal characteristics. It reveals the propagation properties of laser signal and establishes a new parameter design method for laser bathymetry system, which can meet the requirment of international airborne laser depth bathymetry system. Then, the waveform distortion of echo signals at different depths are simulated under the specific system parameters. The adaptive matching filter algorithm is designed to improve the measurement precision.
Results The simulation results revealed that the designed system parameters and the adaptive matched filtering algorithm can achieve the performance with the maximum detection depth of 50 m with measurement accuracy of 166 mm in the daytime and with the maximum detection depth of 70 m with measurement accuracy of 172 mm at night for laser bathymetry system.
Conclusions The results show that the adaptive matched filtering algorithm can improve the measurement accuracy and serve the marine surveying and mapping of China.
- laser bathymetry,
- cross-media laser transmission,
- adaptive matched filtering,
- Monte Carlo simulation

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