TDOA定位中到达时间及时间差误差的统计模型

Statistical Model on the Time and Time Difference Error of Arrival in TDOA Location Estimation

移动通信环境中,非视距传播与多径效应引起的信号附加时延是影响TDOA定位精度的主要因素,深入研究信号到达时间差误差的统计特性,有利于进一步提高TDOA定位的精度.基于移动通信环境中非视距传播信号附加时延服从指数分布的特性,综合考虑信号检测过程中引入的系统误差,利用统计分析方法,建立了信号到达时间的统计模型和到达时间差的误差分布模型.模型反映了蜂窝网络中信号到达时间和到达时间差误差的统计规律,模拟实验证明了模型的有效性.

Additional time delay of arrival resulted from non-line of sight （NLOS）propagation and muff-path effect in cellular environment is the dominant factor resulting in TDOA location error, study on the statistical property of TDOA error is useful for improving the accuracy of TDOA location. Based on the exponential distribution property of NLOS propagation delay, and considering the system error resulted from the signal detection, the authors establish a statistical model of arrival time and a model of TDOA error distribution by statistics when non-light of sight and multi-path propagation exist. The models reflect the statistical property of arrival time and TDOA error in cell network, the simulation shows that the proposed models have a good accuracy and a satisfactory behavior.