时差定位(Time Difference of Arrival,TDOA)是一种广泛应用的被动定位技术,具有定位精度高、组网能力强、系统鲁棒性强等特点.针对运动目标定位计算复杂、精度收敛较慢等问题,在给出视距(Line of Sight,LOS)环境下定位模型的基础上,提出了定位适用于多站时差定位系统的定位方法,该方法将组群时差定位关系方程合理地线性化为统计估计问题,利用在线迭代实时求解目标位置.给出了针对目标不同运动特性条件下的多平台协同定位算法及其仿真结果,仿真结果表明所述方法可以实现对目标的精确定位,并且分析了运动形式对于定位精度的影响,仿真结果对于系统的工程设计具有指导作用.
A Method of TDOA Location in LOS Environment based on Target Movement Pattern
TDOA(Time Difference of Arrival)is a widely used passive positioning technology with high precision,strong ability of collaborating,high robustness.The issues of computational complexity and slow accuracy convergence for the positioning of moving target are addresses.Based on the positioning model in LOS(Line of Sight)environment,a positioning method suitable for a multi-station TDOA system is provided.After linearizing collaboration TDOA positioning relationship equations into a statistical estimation problem,this method online converges iteratively to solutions of targets'locations.A multiplatform collaborative positioning algorithm for different motion characteristics of the targets.Simulations results demonstrate that the provided method can achieve precise positioning.Moreover,the impact of motion patterns on positioning accuracy is analyzed,and simulation results provide guidance for system engineering design.
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