• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Sensors, systems, and next-generation satellites XX >Analysis of smear in high-resolution remote sensing satellites
【24h】

Analysis of smear in high-resolution remote sensing satellites

机译：高分辨率遥感卫星的拖影分析

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High-resolution remote sensing satellites (HRRSS) that use time delay and integration (TDI) CCDs have the potential to introduce large amounts of image smear. Clocking and velocity mismatch smear are two of the key factors in inducing image smear. Clocking smear is caused by the discrete manner in which the charge is clocked in the TDI-CCDs. The relative motion between the HRRSS and the observed object obliges that the image motion velocity must be strictly synchronized with the velocity of the charge packet transfer (line rate) throughout the integration time. During imaging an object off-nadir, the image motion velocity changes resulting in asynchronization between the image velocity and the CCD's line rate. A Model for estimating the image motion velocity in HRRSS is derived. The influence of this velocity mismatch combined with clocking smear on the modulation transfer function (MTF) is investigated by using Matlab simulation. The analysis is performed for cross-track and along-track imaging with different satellite attitude angles and TDI steps. The results reveal that the velocity mismatch ratio and the number of TDI steps have a serious impact on the smear MTF; a velocity mismatch ratio of 2％ degrades the MTF_(smear) by 32％ at Nyquist frequency when the TDI steps change from 32 to 96. In addition, the results show that to achieve the requirement of MTF_(smear) ≥ 0.95 , for TDI steps of 16 and 64, the allowable roll angles are 13.7° and 6.85° and the permissible pitch angles are no more than 9.6° and 4.8°, respectively.
机译：使用时间延迟和积分（TDI）CCD的高分辨率遥感卫星（HRRSS）有可能引入大量图像拖影。时钟和速度不匹配拖尾是导致图像拖尾的两个关键因素。时钟拖尾现象是由在TDI-CCD中计时电荷的离散方式引起的。 HRRSS和被观察物体之间的相对运动使图像运动速度必须在整个积分时间内与电荷包传输的速度（线速）严格同步。在天底成像时，图像运动速度会发生变化，从而导致图像速度和CCD的线速之间发生异步。推导了HRRSS中图像运动速度的估计模型。通过使用Matlab仿真，研究了这种速度失配与时钟拖尾相结合对调制传递函数（MTF）的影响。针对具有不同卫星姿态角和TDI步距的跨轨道和沿轨道成像进行分析。结果表明，速度失配率和TDI步数对涂片MTF有严重影响。当TDI步长从32变为96时，速度不匹配率2％会使Nyquist频率的MTF_（smear）降低32％。此外，结果表明，对于TDI，要达到MTF_（smear）≥0.95的要求在步骤16和64中，允许的侧倾角分别为13.7°和6.85°，允许的俯仰角分别不超过9.6°和4.8°。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号