光学学报, 2014, 34 (3): 0328002, 网络出版: 2014-02-28   

合成孔径激光成像雷达散斑天线接收特性分析

Analysis of Integrated Speckle Receiving Characteristics Based on Synthetic Aperture Imaging Ladar
作者单位
1 中国科学院上海光学精密机械研究所中国科学院空间激光通信及检测技术重点实验室, 上海 201800
2 中国科学院大学, 北京 100049
摘要
合成孔径激光成像雷达(SAIL)时空散斑效应严重影响了成像质量。在时空散斑效应基础上,分析了合成孔径激光成像雷达中的散斑天线接收特性,建立了光学接收天线散斑孔径积分场的物理模型,模拟了目标分辨单元光学接收天线散斑孔径积分场距离向时间变化、方位向空间变化的二维分布。分析了不同接收天线散斑尺度比、不同天线积分起始位置对接收天线散斑孔径积分场的影响,并根据其统计性质得到散斑效应影响较小的接收天线尺寸和接收天线积分范围,为合理设计散斑效应较小的接收天线尺寸提供了参考,对进一步分析时空散斑效应如何影响SAIL目标成像有直接意义。
Abstract
In synthetic aperture imaging ladar (SAIL), laser space-time speckle effect severely reduces the image quality. Based on the previous research about space-time speckle effect, integrated speckle characteristics are first investigated, and the physical model of integrated speckle over antenna aperture is established. According to simulation results, two-dimensional distribution of antenna-integrated speckle field is first presented, and its dependences on the scale and the initial position of receiving antenna are analyzed by specific examples. We also find the rational scale of receiving antenna and the preferable integration area to the space-time varying speckle field. Consequently references on the design of the rational receiving antenna, which could partly suppress the speckle effect, are provided, and it is meaningful to study how the space-time speckle effect degrades the visual quality of the SAIL image.

许倩, 周煜, 孙建锋, 孙志伟, 马小平, 刘立人. 合成孔径激光成像雷达散斑天线接收特性分析[J]. 光学学报, 2014, 34(3): 0328002. Xu Qian, Zhou Yu, Sun Jianfeng, Sun Zhiwei, Ma Xiaoping, Liu Liren. Analysis of Integrated Speckle Receiving Characteristics Based on Synthetic Aperture Imaging Ladar[J]. Acta Optica Sinica, 2014, 34(3): 0328002.

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