地震研究

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 location which based on the initial value determination of DTOA and DOA and accurate iterative of Newton iterative 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 condition.

引言
1 目标定位原理
2 算法
3 震源定位精度分析
4 结语

图1 三维时差定位示意图<br/>Fig.1 Schematic diagram of 3D TDOA location

图1 三维时差定位示意图
Fig.1 Schematic diagram of 3D TDOA location

图2 单基线相位干涉仪侧向原理图<br/>Fig.2 Lateral principle graph of single-baseline phase interferometer

图2 单基线相位干涉仪侧向原理图
Fig.2 Lateral principle graph of single-baseline phase interferometer

表1 震动波传播速度测算<br/>Tab.1 Measurement of vibratioon wave propagation velocity

表1 震动波传播速度测算
Tab.1 Measurement of vibratioon wave propagation velocity

图3 局部震动信号<br/>Fig.3 Local vibration signal

图3 局部震动信号
Fig.3 Local vibration signal

表2 震源定位结果<br/>Tab.2 The source location results

表2 震源定位结果
Tab.2 The source location results

图4 判断初至波时刻图<br/>Fig.4 Determine the time of the first arrival

图4 判断初至波时刻图
Fig.4 Determine the time of the first arrival

表3 定位结果误差分析<br/>Tab.3 Error analysis of positioning results

表3 定位结果误差分析
Tab.3 Error analysis of positioning results

图5 不同误差情况下星型布站GDOP分布图<br/>(a)a=0.03 m,b=0.5 ms;(b)a=0.01 m,b=50 us<br/>Fig.5 GDOP distribution in star-model station position under different error conditions

图5 不同误差情况下星型布站GDOP分布图
(a)a=0.03 m,b=0.5 ms;(b)a=0.01 m,b=50 us
Fig.5 GDOP distribution in star-model station position under different error conditions

图6 不同布站形式GDOP图<br/>(a)星型布站;(b)平行四边形布站;(c)菱形布站;(d)倒三角布站<br/>Fig.6 GDOP in different forms of station arrangement (a)star-model station position;(b)parallelogram-model station position;(c)dimod-model station position;(d)upside-down triangle-model station position

图6 不同布站形式GDOP图
(a)星型布站;(b)平行四边形布站;(c)菱形布站;(d)倒三角布站
Fig.6 GDOP in different forms of station arrangement (a)star-model station position;(b)parallelogram-model station position;(c)dimod-model station position;(d)upside-down triangle-model station position

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备注

引言

1 目标定位原理

2 算法

3 震源定位精度分析

4 结语

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