基于微波辐射计的多舰无源定位算法

摘要

关于舰艇水面目标定位精度研究,多基被动探测交叉定位的精度及稳定性为主要问题.对于多舰被动探测系统,微波辐射计对目标实现定位的最小二乘方法,采用线性近似,定位精度较低；若采用非线性近似如牛顿迭代等方法,又需要考虑迭代的收敛性以及计算量问题.为解决上述问题,提出了一种利用线性最小二乘再结合加权的定位方法.先任取两舰测量所得的方位角利用线性最小二乘法得交会结果,而后利用一种加权运算对交会结果进行融合,得到了多舰定位模型及误差分析.仿真结果表明,新算法提高了定位的精度,增强了定位稳定性.%Study the accuracy and stability problem of passive detection cross . Based on the microwave radiome ter for goals positioning, the least-square method uses linear approximation and the positioning accuracy is lower. U sing nonlinear approximate such as Newton iterative method has to consider the iterative convergence and computation problem. Based on this situation, a new data fusion approach was given. This method used linear least squares com bined with weighting localization. First, the azimuth angle of two vessels was taken to obtain the rendezvous result based on the least-square method. Then, a weighting operation was introduced to carry on the fusion to get multiple -vessel localization model and the error analysis. The simulation result indicates that the new algorithm increases the localization precision, and enhances the positioning stability.