T-R型双基地声纳定位算法及系统精度研究

Research on systemic accuracy of localization algorithm for the type of T-R bistatic sonar

根据T-R型双基地声纳定位的几何模型,提出利用时延-方位信息进行目标定位的双基地声纳时间方位定位(bistatic time-bearing-localization,BTBL)算法,并给出了算法定位误差的几何分布。通过数值仿真,研究了基线长度、时间测量误差和方位测量误差对算法定位精度的影响。仿真分析结果表明:随着基线长度增加,发射站和接收站两侧区域定位精度进一步改善,但会造成基线区的定位误差增大;在基线长度一定时,时间和方位测量误差增大均造成定位精度下降,且算法精度对方位测量误差相对敏感。与同等条件下的单基地声纳定位相比,双基地BTBL算法在接收站点具有明显的探测优势。该研究为T-R型双基地系统的水下定位提供了理论依据。

According to the geometrical model of the type of T-R bistatic sonar,a bistatic time-bearing-lo-calization （BTBL）algorithm is proposed which fixes the position by the information of time and bearing.At the same time,the error of geometrical distribution is presented.Through numerical similation,some factors which influence the localization accuracy of the algorithm are studied,including baseline length,measuring errors of time and bearing.The results of simulation validate that the localization accuracy of areas at is better than that of areas nearby the transmitter.The sides of the source and the receiver is improved with the length of the base-line added,however,the location error in baseline extent increases.For the given baseline,the increased meas-uring errors of time and bearing will decrease the localization accuracy.Furthermore,arithmetic precision is rel-atively sensitive to the error of bearing measurement.The BTBL arithmetic of bistatic sonar has higher localiza-tion accuracy than that of the monostatic when the detected area is nearby the position of the receiver.The study provides a well theoretical evidence for the underwater localization of the type of the T-R bistatic system.