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强震仪的基线漂移误差是一项极其复杂的误差,它的准确确定是恢复高精度同震速度和位移信息的前提.当前,各种经验的基线校正方法因不能准确客观描述基线漂移的特性,改正后的结果存在不同程度的偏差.本文提出一种基于PPP技术实时识别和校正强震仪基线漂移的方法.该方法将两种传感器的数据在观测值域进行紧组合处理,一方面强震仪的基线漂移误差可以被有效识别和校正,另一方面,GPS的随机误差可以进一步得到控制和减弱,组合系统可以实时得到最优的位移、速度和加速度信息.实验结果表明,该方法能实时估计复杂的同震瞬时基线漂移,比经验的双折线校正方法更具客观性和准确性,对于实时地震监测预警具有重要意义.
Baseline drift error of the seismograph is an extremely complicated error and its accurate determination is the precondition of recovering the high-accuracy co-seismic velocity and displacement information.At present, various empirical baseline correction methods can not accurately and objectively describe the characteristics of the baseline drift , The corrected results have different degrees of deviation.This paper presents a method based on real-time PPP technology to identify and calibrate the base line drift of the strong earthquakes.This method will be two kinds of sensor data in the observation range tight combination of processing, on the one hand On the other hand, the random error of GPS can be further controlled and weakened, and the combined system can obtain the optimal displacement, velocity and acceleration information in real time.Experimental results show that this method can effectively Real-time estimation of complex co-seismic transient baseline drift is more objective and accurate than the empirical two-fold calibration method, which is of great significance for real-time earthquake monitoring and early warning.