Spaceborne Interrupted Frequency Modulation Continuous Wave SAR Imaging Based on Accumulated Aperture Interpolation Technique
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摘要: 间断调频连续波(IFMCW)合成孔径雷达(SAR)模式通过在不同时间间隔内交替发射和接收信号，解决了星载调频连续波(FMCW)SAR必须收发分置的问题。然而，在该模式下，雷达天线会间歇性地工作于发射和接收状态，从而导致回波数据中出现周期性的空缺。为了解决上述问题，该文提出了一种基于积累孔径插值技术的缺失数据迭代自适应成像处理方法(MIAA-AAIT)，用于恢复缺失的数据。实验结果表明，所提方法可以有效地恢复缺失数据，从而显著提高成像质量，大幅降低由周期性数据缺失引起的虚假目标能量。Abstract: The Intermittent Frequency Modulation Continuous Wave (IFMCW) Synthetic Aperture Radar (SAR) mode solves the problem that the spaceborne Frequency Modulation Continuous Wave (FMCW) SAR must be bistatic by alternately transmitting and receiving signals in different time intervals. However, in this mode, the radar antenna will work intermittently in the transmitting and receiving state, resulting in periodical gaps in the echo data. In order to solve the above problems, a Missing-data Iterative Adaptive imaging processing Approach (MIAA) is proposed, based on Accumulated Aperture Interpolation Technique (AAIT) to recover the data gaps. Experimental results show that the proposed method can effectively recover missing data, thus improving significantly imaging quality and suppressing greatly the artifacts energy caused by the periodical data gaps.
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表 1 星载IFMCW SAR模式仿真参数
参数 数值 参数 数值 雷达工作载频(Hz) 16.70 脉冲发射频率(Hz) 3479.00 雷达有效速度(m/s) 7613.00 天线长度(m) 4.48 带宽(MHz) 180.00 接收脉冲(个) 13 景中心斜距(km) 534.00 缺失脉冲(个) 12 发射脉冲时宽(μs) 266.71 斜视角(°) 0 
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表 2 研究区域IC和IE
模式 IC IE FMCW 1.70 10.35 IFMCW 0.94 11.53 LPM-AAIT 1.58 10.92 MIAA-AAIT 1.63 10.56
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