远程多光束激光相干场成像拍频误差校正研究
Beat frequency error rectifying in multi-beam laser coherent remote tmaging
查看参考文献21篇
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文摘
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多光束激光相干成像技术是地基观测空间目标的重要方式,各光束的稳定性和性能一致性直接决定着系统成像质量,目前针对系统频率稳定性对成像质量的影响以及激光源频漂的补偿已有一定研究,然而针对多光束发射系统,由驱动放大噪声及声光移频噪声引起的各光束间独立的频漂还需进一步抑制.基于此,本文提出了动态解调和置信区间解调两种抑制方法,理论仿真了动态解调对缓慢频漂抑制的可行性,同时实验证明了置信区间解调法对成像效果的提升,并在200 m和1.2 km的湍流环境中对该解调方法进行了验证.研究表明,置信区间解调法对于各拍频间独立漂移有较好的实时补偿效果,能够有效抑制发射阵列中由声光调制及驱动放大引入的频率噪声,对水平距离1.2 km外的25 mm目标成像角分辨率达到4 μrad.本研究为未来远程大功率发射阵列成像中的频率噪声抑制提供了较好的技术方案. |
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其他语种文摘
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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. |
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来源
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物理学报
,2018,67(4):044201-1-044201-10 【核心库】
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DOI
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10.7498/aps.67.20172125
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关键词
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相干场成像
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多光束
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拍频漂移
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置信区间
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地址
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中国科学院西安光学精密机械研究所, 西安, 710119
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-3290 |
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学科
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电子技术、通信技术 |
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基金
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国家自然科学基金
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解放军总装备部预研项目
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文献收藏号
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CSCD:6192378
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参考文献 共
21
共2页
|
|
1.
Holmes R B.
J. Opt. Soc. Am. A,1996,13:351
|
被引
24
次
|
|
|
|
|
2.
Lu C M.
Proc. SPIE 8551,2012:855110
|
被引
1
次
|
|
|
|
|
3.
张文喜. 相干场成像技术分辨率研究.
物理学报,2013,62:164203
|
被引
14
次
|
|
|
|
|
4.
张羽.
物理学报,2016,65:114201
|
被引
3
次
|
|
|
|
|
5.
董磊.
中国光学与应用光学,2010,3:440
|
被引
6
次
|
|
|
|
|
6.
Hutchin R A.
US Patent 0292481 A1,2012
|
被引
1
次
|
|
|
|
|
7.
陈明徕. 基于全相位谱分析的剪切光束成像目标重构.
物理学报,2017,66:024203
|
被引
8
次
|
|
|
|
|
8.
陆长明. 四光束剪切相干成像目标重构算法研究.
物理学报,2017,66:114201
|
被引
4
次
|
|
|
|
|
9.
兰富洋. 剪切光束成像技术对纵深目标的成像.
物理学报,2017,66:204202
|
被引
5
次
|
|
|
|
|
10.
Montilla I.
J. Opt. Soc. Am,2010,27:A9
|
被引
1
次
|
|
|
|
|
11.
William T.
Appl. Opt,2012,51:A11
|
被引
1
次
|
|
|
|
|
12.
Daissy H.
Digital Holography and Three-Dimensional Imaging (Miami) DTuB8,2010
|
被引
1
次
|
|
|
|
|
13.
Stephen T.
Proc. SPIE 7735,2010:77356Z-1
|
被引
1
次
|
|
|
|
|
14.
孔新新. 傅里叶望远镜中激光频移误差对成像质量影响的分析.
光学学报,2012,32:1211001
|
被引
7
次
|
|
|
|
|
15.
孔新新. 多光束傅里叶望远镜的移频设计.
激光与光电子学进展,2013,50:011102
|
被引
4
次
|
|
|
|
|
16.
曹蓓. 相干场成像全相位目标直接重构法.
物理学报,2015,64:124205
|
被引
8
次
|
|
|
|
|
17.
陈卫. 基于全相位谱分析的傅里叶望远术目标重构.
光学学报,2010,30:3441
|
被引
15
次
|
|
|
|
|
18.
Holmes R B.
Proc. SPIE 3815,1996:11
|
被引
1
次
|
|
|
|
|
19.
Cuellar E L.
Proc. SPIE 7094,2008:70940G
|
被引
7
次
|
|
|
|
|
20.
Matwyschuk A.
Appl. Opt,2017,56:7766
|
被引
2
次
|
|
|
|
|
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