基于时延方位估计的多基地模式轨迹解算算法

Multistatic mode trajectory solution algorithm based on time delay direction estimation

单基地模式的声呐探测系统存在工作方式固定、定位精度低的缺陷多基地定位声呐中T-Rn定位方式存在观测和测量缺失的问题。文章结合多基地系统在跟踪阶段中所获得的信号波达时间、接收信号幅度和信号来向角等多元先验信息,对基于波达时间及方位的定位算法进行了深入研究。文章提出了一种利用空间椭圆轨迹交汇的目标位置解算算法,并以空间反向投影算法辅助完成目标定位。该算法首先获取目标回波的相位关系,利用基于广义互相关的时延估计算法得到系统工作周期内的平均时延估计量。基阵的垂直方位观测量可通过接收信号的方位估计值获得,轨迹解算算法分别采用了椭圆轨迹交汇与几何定位法。最后给出了完整的算法流程,误差评估的仿真结果验证了交汇定位算法的有效性,该方式可有效保证多基地模式下的目标定位跟踪任务的执行效率,对实际工程应用中系统定位精度的评估有一定参考价值。

There are defects of fixed working mode and low positioning accuracy in the mono-static sonar detection system,and there is a problem of missing observation and measurement of T-Rn positioning method in the multi-static positioning sonar.By combining the arrival time and amplitude of the received signal and its direction angle obtained by the multi-static sonar in the tracking stage,the positioning algorithm based on the arrival time of the signal and its orientation is deeply studied in this paper.A target position solution algorithm using the intersection of spatial elliptical trajectories is proposed,and the spatial reverse projection algorithm is used to assist in completing the target positioning.The algorithm first obtains the phase relationship of the echo signal,and the generalized cross-correlation delay estimation algorithm is used to obtain the average delay estimation during the working cycle of the system.Then the vertical azimuth observation of the base array is obtained by the bearing estimation of the received signal,and the trajectory solution algorithm is completed by elliptic trajectory intersection and geometric positioning method.Finally,the complete flowchart of the target position solution algorithm is given,and the simulation results of error evaluation verify the effectiveness of the intersection positioning algorithm,which can effectively ensure the execution efficiency of the target positioning tracking task in multi-static mode,and has a certain reference value for the evaluation of system positioning accuracy in practical engineering applications.