Measurement for LOS stabilization accuracy of electro-optical imaging system on moving carrier

被引：4
|
作者：
Sun H. [1 ]
Lang X.-L. [1 ]
Li Z.-Q. [1 ]
Sun L.-N. [1 ]
机构：
[1] Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2011年 / 19卷 / 09期
关键词：
Electro-optical imaging system; Field of view; LOS stabilization accuracy; Phase-only Correlation(POC); Sub-pixel-level;
D O I：
10.3788/OPE.20111909.2131
中图分类号：
学科分类号：
摘要：
A novel measurement scheme for the stabilization accuracy of a Line of Sight(LOS) in an electro-optical imaging system on a moving carrier is proposed. The principle of optical measurement for LOS stabilization accuracy is briefly introduced, and the optical design of an autocollimator with a large field of view and a detection algorithm for the light-spot position are investigated. The autocollimator is used to test orientation changes of the LOS which is represented by a mirror fixed on the frame of the electro-optical imaging system. A high-speed CMOS camera for the collection of images and an algorithm for image registration based on Phase-only Correlation (POC) are employed to detect sub-pixel level displacement of light-spot images by calculation of the normalized cross-power spectrum between pairs of images. The scheme has been used in the LOS stabilization accuracy measurement system, and a calibrating experiment is set up using a Leica theodolite. The experimental results show that the RMS error of the angular measurement is less than 2 μrad when the field of view is ±1° and the sampling rate is 500 frame/s. The dynamic measurement can meet the system requirements of a larger field of view and a greater precision.
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收藏
页码：2131 / 2137
页数：6
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