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Beat frequency error rectifying in multi-beam laser coherent remote tmaging
其他题名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.
作者部门光电测量技术实验室
2018-02-20
发表期刊ACTA PHYSICA SINICA
ISSN1000-3290
卷号67期号:4
产权排序1
摘要

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.

文章类型Article
关键词Coherent Imaging Multi-beam Beat Frequency Drift Dependence Range
学科领域Physics, Multidisciplinary
WOS标题词Science & Technology ; Physical Sciences
DOI10.7498/aps.67.20172125
收录类别SCI ; EI ; CSCD
语种中文
WOS研究方向Physics
项目资助者National Natural Science Foundation of China(61505248) ; Research Foundation of General Equipment Department, China(9140A21020115ZK18001)
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000428113200010
引用统计
文献类型期刊论文
条目标识符http://ir.opt.ac.cn/handle/181661/30024
专题光电测量技术实验室
通讯作者Zhang, Y (reprint author), Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China.
作者单位Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China
推荐引用方式
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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