Improvement of joint transform correlator for measurement of space camera image motion

XU Bo-qian; GUO Yong-fei; WANG Gang

doi:10.3788/OPE.20142206.1418

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Improvement of joint transform correlator for measurement of space camera image motion

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- Improvement of joint transform correlator for measurement of space camera image motion
- Optics and Precision Engineering Vol. 22, Issue 6, Pages: 1418-1423(2014)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142206.1418
  CLC： V447.3;TP391
- Received：26 March 2013，
  
  Revised：13 May 2013，
  
  Published：25 June 2014
- 稿件说明：
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许博谦, 郭永飞, 王刚. 测量空间相机像移量的联合变换相关器的改进[J]. 光学精密工程, 2014,22(6): 1418-1423

XU Bo-qian, GUO Yong-fei, WANG Gang. Improvement of joint transform correlator for measurement of space camera image motion[J]. Editorial Office of Optics and Precision Engineering, 2014,22(6): 1418-1423
许博谦, 郭永飞, 王刚. 测量空间相机像移量的联合变换相关器的改进[J]. 光学精密工程, 2014,22(6): 1418-1423 DOI： 10.3788/OPE.20142206.1418.

XU Bo-qian, GUO Yong-fei, WANG Gang. Improvement of joint transform correlator for measurement of space camera image motion[J]. Editorial Office of Optics and Precision Engineering, 2014,22(6): 1418-1423 DOI： 10.3788/OPE.20142206.1418.

摘要

针对基于光学手段实现的传统光学联合变换相关器不适应空间环境等问题，对传统相关器进行了改进和试验验证。首先，采用完全电子学手段替代采用光学器件实现的方法解决了联合变换相关器适应空间环境的问题。然后，在联合变换过程中加入自相关运算，消除了零级衍射峰的影响，并引入过采样离散傅里叶变换方法提升相关器的测量精度。最后，采用精密直线导轨开展静态测试试验，验证了改进后的联合变换相关器的性能。静态测试试验表明：对于亚像元级的微小位移量，改进后的联合变换相关器测量误差均方根（RMS）值为0.22 pixel。改进后的联合变换相关器显示了良好的空间环境适应性和较好的可实现性，其精度基本满足空间相机像移补偿的要求。

Abstract

As traditional joint transform correlators based on space light modulators can not adapt to the radioactive environment in space

a new correlator implemented by an electronic processor was introduced and testified. First

the traditional optical device was replaced by a digital processor to allow the new correlator to adapt to the radioactive environment. Then

a self-correlation calculation was added to the joint transform processing to eliminate the influence of zero-level diffraction

and the over-sampled discrete Fourier transform method was introduced to increase the measurement precision. Finally

the static measurement with a linear platform was performed to testify the improved joint transform correlator. Experimental results indicate that the measuring precision of the system on subpixel displacement is within 0.22 pixel(Root Mean Square

RMS). The improved joint transform correlator is good at both space environment adaptability and realization

its measurement precision can satisfy the system requirements of satellite cameras for the image motion compensation

and has a good application prospect.

关键词

Keywords

references

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