基于DTOA/DOA和牛顿迭代法的震源定位方法研究

Research on Seismic Source Localization Method Based on DTOA/DOA and Newton Iterated Algorithm

结合DTOA和DOA联合定位估计性好与牛顿迭代法收敛速度快的优点,提出了一种基于DTOA和DOA初值选取和牛顿法精确迭代的震源定位方法。经过野外实验和仿真,发现该方法能有效地提高震源定位的准确性。通过对影响震源定位精度因素分析,表明减小传感器基站站盐和初至波到时差测量误差可有效提高定位精度,相同同条件下,星型布站的定位精度最高。

Combining with the advantages of good performance in estimation of DTOA and DOA joint location and high speed of convergence in iteration of Newton iterative method, we put forward a new algorithm of source lo- cation which based on the initial value determination of DTOA and DOA and accurate iterative of Newton itera- tive algorithm. Through the field experiment and simulation, we find that this algorithm can effectively improve the accuracy of source location. The analysis result of the influence factor of source location precision shows that measuring error of reducing the sensor base station site and arrival time difference of first break could effectively improve location precision, and location precision in the star-model station position is highest in the same condi- tion.