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中文摘要：
在InSAR干涉图数据处理过程中,通常会由于轨道参数不准确而导致去平地效应后,干涉图中仍残留部分线性相位。为避免线性趋势对数据处理结果精度的影响,提出了一种基于干涉图条纹频率检测的去除线性趋势精化方法：首先,通过Chirp-Z变换精化干涉图条纹频率估计,计算出精确到0.1的线性相位条纹数;然后,模拟线性相位并从干涉图中去除。利用通过模拟和真实数据对提出的方法进行验证分析,实验结果表明：该方法能够更加彻底地去除干涉图中残留的线性趋势,对提高InSAR技术的监测精度具有一定意义。
英文摘要：
In InSAR data processing,some residual linear phase trend still were left in the flattened interferogram due to the inaccuracy orbit parameters.In order to remove the effects of the residual linear phase trend on final InSAR results,a method to refine the instantaneous frequency estimation of InSAR interferogram and to remove the residual linear trend was introduced.First,the instantaneous frequency of interferogram is estimated with the accuracy of 0.1 fringes with the Chirp-Z transform.Secondly,the linear trend is simulated from the instantaneous frequency and used to correct the InSAR interferogram.Finally,simulated and real data are used to test the method.The results show that the proposed method can completely remove the linear trend in INSAR interferogram and will help to improve the accuracy of InSAR greatly.
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