Research on speckle noise of laser Doppler velocimeter for the vehicle self-contained navigation

被引：1

作者：

Zhou, Jian ^{[1
]}

Nie, Xiaoming ^{[1
]}

Long, Xingwu ^{[1
]}

机构：

[1] Natl Univ Def Technol, Coll Optoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China

来源：

OPTIK | 2014年 / 125卷 / 19期

基金：

中国国家自然科学基金;

关键词：

Multipoint layer-type laser Doppler velocimeter; Speckle broadening; Vehicle-mounted self-contained navigation system; SYSTEM;

D O I：

10.1016/j.ijleo.2014.07.048

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A novel multipoint layer-type laser Doppler velocimeter (MLLDV) is designed to measure the velocity of a vehicle for the self-contained navigation system. In order to investigate the speckle's influence on the Doppler spectrum, formulas of time-lagged covariance and speckle broadening were derived for our MLLDV. Simulations and experiments are made for detailed analysis. The results show that the time-lagged covariance of photocurrent is directly proportional to the incident angle, and is inversely proportional to the elevation fluctuation of the ground together with the velocity of the vehicle. Speckle broadening is a function of the vehicle's velocity, the 1/e(2) Gaussian spot radius and the phase correlation length of the ground. For our MLLDV, Doppler frequency and Doppler broadening are both directly proportional to the velocity of the vehicle. Besides, the ratio between Doppler broadening and the corresponding Doppler frequency is about 0.72% when the speed of the vehicle varies from 0 to 9.6 m/s. (C) 2014 Elsevier GmbH. All rights reserved.

引用

页码：5878 / 5883

页数：6

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