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分析了干涉测量中FX型相关处理方案存在的问题,提出了一种改进的FX相关处理方案。该方案经过两次整数比特时延补偿将两站接收信号相对时延缩小到一个比特内,从而避免了相位卷绕现象的出现,同时省去了原方案中的小数比特时延补偿;接着对改进方案做了深入的分析。利用小波变换对互谱相位进行滤波,在一定程度上改善了时延估计的性能。蒙特卡罗仿真和实测数据处理结果验证了改进的准确性和有效性。
The problems existing in the FX-related processing scheme in the interferometric measurement are analyzed, and an improved FX-related processing scheme is proposed. The scheme compensates for the relative delay between received signals of two stations within one bit after two integer bit delay compensation to avoid the occurrence of phase winding phenomenon and eliminates the fractional bit delay compensation in the original scheme. Improved programs have done in-depth analysis. Using wavelet transform to filter the cross-spectral phase, the performance of delay estimation is improved to a certain extent. Monte Carlo simulation and measured data processing results verify the accuracy and effectiveness of the improvements.