中国空间科学技术

›› 2011, Vol. 31 ›› Issue (6): 43-49.doi: 10.3780/j.issn.1000-758X.2011.06.007

• 技术交流 • 上一篇    下一篇

采样式航天光学遥感成像系统混叠噪声

 姜伟1, 陈世平2   

  1. （1 北京空间机电研究所，北京 100076）（2 中国空间技术研究院，北京 100081）
  • 收稿日期:2011-01-24 修回日期:2011-12-25 出版日期:2011-12-25 发布日期:2011-12-25
  • 作者简介:姜伟 1978年生， 2009年获中国空间技术研究院飞行器设计专业工学博士学位。工程师，研究方向为航天光学遥感。

Aliased Noise of Optical Sampling Imaging System for Space Remote Sensing

 JIANG  Wei1, CHEN  Shi-Ping2   

  1. (1 Beijing Institute of Space Mechanics & Electricity， Beijing 100076)
    (2 China Academy of Space Technology， Beijing 100081)
  • Received:2011-01-24 Revised:2011-12-25 Published:2011-12-25 Online:2011-12-25

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摘要： 为了准确计算采样式航天光学遥感成像系统中混叠噪声的权重和分析系统设计参数的影响，采用经验景物模型，模拟成像系统主要噪声源的统计特性，提出了一种含混叠的成像系统噪声计算模型。采用该模型，以某卫星高分辨率相机成像系统为例，计算混叠噪声功率占总噪声功率的百分比，并对不同λF/p参数和不同景物参数的情况进行了仿真。结果表明：该卫星高分辨率相机成像系统中，混叠噪声占较大比重；当提高λF/p时，可有效降低混叠噪声。

关键词: 光学采样成像系统, 混叠噪声, 航天遥感

Abstract: In order to exactly calculate the ratio of  aliased noise in optical sampling imaging system for space remote sensing and analyze the influence of the system parameters，all leading noise sources were statistically modeled with an experimental scene model，and a noise calculating model including aliased noise was brought forward. By using this model，the ratio of aliased noise power was calculated with a spaceborne high resolution camera imaging system parameters，and the situations with different λF/p and different scene were simulated. The results show that the ratio of aliased noise is high in a spaceborne high resolution camera imaging system，and the aliased noise can be reduced by increasing λF/p.

Key words: Optical sampling imaging system, Aliased noise, Space remote sensing