只测角单站被动式高精度定位方法

讨论了只测角被动式单目标环境下固定发射源的位置可观测性条件，并进行理论分析，给出定位精度的Cramer-Rao下界，提出以最大化Fisher信息矩阵行列式为原则来优化侦察机轨迹，改善目标的定位精度。建立解此最优问题的模型，研究了利用计算机求解最优轨迹的方法。基于极大似然估计，提出了高精度被动目标定位方法。仿真结果表明，该方法可以显著地提高目标的定位精度，并使其逼近Cramer-Rao下界。

Bearing-Only Measurements Based High-Precision Location with Single Passive Sensor

The observability condition for single fixed emitter with bearing only measurements was reviewed. The theoretical analysis was done and the Cramer Rao bound of location precision was given. Trajectory of an observer was optimized based on maximizing the Fisher Information Matrix(FIM) determinant to improve the location precision. Then the model solving the optimization problem was developed and the optimized trajectory was found utilizing the computer numerical solution. Finally, a method of high precision location with bearing only measurements and single passive sensor was presented based on a maximum likelihood estimator. The simulation results show that the passive location precision is remarkably improved and the Cramer Rao bound is effectively approximated using the optimal observer trajectories.