【摘要】 针对地震动目标定位中的信号传播速度不确定性问题,提出了基于到达时间差的四传感器方阵目标方位角估计方法。从理论上推导出四传感器方阵下的目标方位角估计带边界及其最大带宽值,证明了信号传播速度与目标方位角估计之间的弱相关性。根据仿真计算深人探讨了信号传播速度和时延测量误差对目标方位角估计精度的影响。外场实验结果证明:这一方法的地震动目标方位角平均估计误差小于采用三轴地震动传感器的方法,具有一定的实用价值。更多还原

【Abstract】 A new approach in moving target bearing estimation based on time differences of arrival of seismic signals received at a four-sensor square array is proposed.The weak correlation between propagation speed of signals and bearing estimation under such sensor layout is exploited in theory,simple and explicit expressions of bearing margins as well as the maximum bearing estimation band range are deduced.Influence of signal propagation speed and time delay measurement errors on precision of bearing estimation is discussed according to simulation computation.It is eventually demonstrated through field experiment that this technique has a smaller bearing estimation error than the commonly used three-axis geophones and it has certain application value.更多还原