测绘学报 ›› 2015, Vol. 44 ›› Issue (5): 510-517.doi: 10.11947/j.AGCS.2015.20140135

• 摄影测量学与遥感 • 上一篇    下一篇

POS与DEM辅助机载SAR多普勒参数估计

程春泉1, 黄国满1, 杨杰2   

  1. 1. 中国测绘科学研究院摄影测量与遥感研究所, 北京 100830;
    2. 武汉大学测绘遥感信息工程国家重点实验室, 湖北 武汉 430079
  • 收稿日期:2014-03-08 修回日期:2014-08-29 出版日期:2015-05-20 发布日期:2015-05-27
  • 作者简介:程春泉(1972—),男,博士,副研究员,研究方向为航空航天光学与雷达遥感影像摄影测量理论与应用。E-mail: cspring@casm.ac.cn
  • 基金资助:
    国家自然科学基金(41071237); 国家863计划(2011AA120405); 测绘地理信息公益行业科研专项(201412002)

Doppler Centroid Estimation for Airborne SAR Supported by POS and DEM

CHENG Chunquan1, HUANG Guoman1, YANG Jie2   

  1. 1. Institute of Photogrammetry and Remote Sensing, Chinese Academy of Surveying and Mapping, Beijing 100830, China;
    2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, China
  • Received:2014-03-08 Revised:2014-08-29 Online:2015-05-20 Published:2015-05-27
  • Supported by:
    The National Natural Science Foundation of China (No.41071237);The National High-tech Research and Development Program(863 Program)(No. 2011AA120405);Special Fund for Surveying, Mapping and Geoinformation in the Public Interests(No. 201412002)

摘要: 由于机载SAR多普勒参数受载机不稳定飞行和复杂地形影响明显,目前仍缺少有效的矢量估计法。本文对POS和DEM数据及其误差对机载多普勒参数的影响进行了分析,以距离-共面方程构建的SAR几何关系为基础,在POS和DEM数据支持下,建立了一种多普勒参数矢量估计法,并通过仿真对提出的方法进行了验证和分析。理论和仿真表明,本文方法在高山地形、不稳飞行及大斜视角等复杂条件下,亦能够为机载SAR瞬时多普勒中心提供高精度估计。

关键词: 多普勒参数估计, 机载SAR, 矢量法, 距离-共面方程, POS, DEM

Abstract: It is difficult to estimate the Doppler frequency and modulating rate for airborne SAR by using traditional vector method due to instable flight and complex terrain. In this paper, it is qualitatively analyzed that the impacts of POS, DEM and their errors on airborne SAR Doppler parameters. Then an innovative vector method is presented based on the range-coplanarity equation to estimate the Doppler centroid taking the POS and DEM as auxiliary data. The effectiveness of the proposed method is validated and analyzed via the simulation experiments. The theoretical analysis and experimental results show that the method can be used to estimate the Doppler centroid with high accuracy even in the cases of high relief, instable flight, and large squint SAR.

Key words: Doppler estimation, airborne SAR, vector method, range-coplanarity equation, POS, DEM

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