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Beat frequency error rectifying in multi-beam laser coherent remote tmaging
Alternative Title远程多光束激光相干场成像拍频误差校正研究
Zhang Yu(张羽); Luo Xiu-Juan(罗秀娟); Liu Hui(刘辉); Chen Ming-Lai(陈明徕); Lan Fu-Yang; Jia Hui; Cao Bei(曹蓓); Zhang, Y (reprint author), Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China.
Department光电测量技术实验室
2018-02-20
Source PublicationACTA PHYSICA SINICA
ISSN1000-3290
Volume67Issue:4
Contribution Rank1
Abstract

Coherent imaging with a multi-beam laser is considered as a key technique in ground based imaging. The image quality is directly determined by stability and consistency of each beam in transmitter. Although the stabilities of laser frequency and the drifting compensation methods have been studied previously, they mostly focused on the laser source. In most cases, especially in large transmitter array, however, transmitted beams are always disturbed by different influential factors, such as frequency drift induced by acoustic-optical modulation (AOM) and high power driven amplification. Therefore this kind of frequency drifting needs further rectification. Aiming at this problem, in this paper we propose two new methods called dynamic demodulation and dependence range demodulation. Firstly, the dynamic demodulation takes the whole drifting frequency drift as a changing procedure. It is believed that the beat frequency drifted at any position still carries the target information, so the system demodulates the signal at that drifted position. According to this method, the response speed of the demodulation system should be very high. But in a real system this acquisition is too high to be satisfied. It cannot work as quickly as expected. In computer simulation some slow varying drifts are induced at the beat frequency and the variation is distributed only in three parts of spatial frequency of transmitter interfering array. Simulation results show that this method may well compensate for slow drifting beat frequency. While its response speed is often limited by hardware system. On the other hand, for the dependence range demodulation, the beat drifting range is considered as a useful district, in which all the beat energy is added and demodulated at a preset position. An experiment is carried out to verify this method. The result demonstrates that it can well restrict the beat frequency drift within 100 Hz, which often happens in the procedure of AOM and driving amplification. Besides the laboratory setup research, the field experiments in 200 m and 1.5 km range are also carried out. The dependence range demodulation is proved to be well performed as well. The resolution of the 25 cm simulated target in 1.5 km reaches 0.008 rad. In the consideration of real system, the imaging range is further expanded and the amplifier power is stronger. The field experiments reveal that this demodulation method is applicable in such a condition. Therefore the research in this article provides some new techniques for the remote high resolution imaging in multi-beam laser interfering imaging.

SubtypeArticle
KeywordCoherent Imaging Multi-beam Beat Frequency Drift Dependence Range
Subject AreaPhysics, Multidisciplinary
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.7498/aps.67.20172125
Indexed BySCI ; EI ; CSCD
Language中文
WOS Research AreaPhysics
Funding OrganizationNational Natural Science Foundation of China(61505248) ; Research Foundation of General Equipment Department, China(9140A21020115ZK18001)
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000428113200010
CSCD IDCSCD:6192378
EI Accession Number20182105214113
Citation statistics
Document Type期刊论文
Identifierhttp://ir.opt.ac.cn/handle/181661/30024
Collection光电测量技术实验室
Corresponding AuthorZhang, Y (reprint author), Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China.
AffiliationChinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Zhang Yu,Luo Xiu-Juan,Liu Hui,et al. Beat frequency error rectifying in multi-beam laser coherent remote tmaging[J]. ACTA PHYSICA SINICA,2018,67(4).
APA Zhang Yu.,Luo Xiu-Juan.,Liu Hui.,Chen Ming-Lai.,Lan Fu-Yang.,...&Zhang, Y .(2018).Beat frequency error rectifying in multi-beam laser coherent remote tmaging.ACTA PHYSICA SINICA,67(4).
MLA Zhang Yu,et al."Beat frequency error rectifying in multi-beam laser coherent remote tmaging".ACTA PHYSICA SINICA 67.4(2018).
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