Ambiguity performance analysis of spaceborne SAR with thermal mechanism errors in phased array antenna
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摘要: 根据星载SAR相控阵天线结构特点,建立了天线热变形误差的数学模型,定义了阵面不平整度指标.基于成对回波畸变理论,推导了天线阵面存在热变形误差时的方向图函数表达式,导出了单频热变形误差分量与模糊度之间的统计关系,提出了定量分析星载SAR相控阵天线热变形误差对模糊性能影响的有效方法.基于L波段星载SAR天线进行了计算机仿真,验证了分析方法的正确性.Abstract: To analyze the ambiguity performance of spaceborne synthetic aperture radar (SAR) with onboard thermal mechanism errors in phased array antenna, a mathematical model for thermal mechanism errors was established, based on the characteristics of spaceborne SAR antenna. The formula of the antenna pattern with thermal mechanism errors were presented, on the basis of paired echo distortion theory. The statistical model for ambiguity performance analysis of thermal mechanism errors in phased array antenna was proposed. The maximum boundary of ambiguity performance requirement was educed. The computer simulation results of a L-band spaceborne SAR was proposed, by which the conclusion was validated.
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Key words:
- synthetic aperture radar /
- phase array antennas /
- performance analysis
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