场面多点定位信号处理独立性的实现

摘要

The characteristics of Multilateration( MLAT) system include complex station distribution and se-rious non line of sight( NLOS) influence when used in large airport surface. For improving positioning ac-curacy,an estimative target position is needed to select best station combination and remove NLOS influ-ence. In the past,the previous position of target is used as the estimative target position,which has a defect that the previous positioning error is introduced into the current target signal processing. Therefore,a new method called target position estimation based on best horizontal dilution of precision( HDOP) is used for achieving signal processing independence. This method uses some new algorithms include fast selection,lo-cation consistency judging and stations optimization to estimate the current target position. Simulation test and real airport data test results prove the feasibility and validity of this new method. In large airport sur-face,this method can increase the continuity and accuracy of positioning in MLAT system.%大型机场的场面多点定位( MLAT)系统具有接收站布局复杂和非视距( NLOS)传播严重的特点,为了选择最佳定位站点组合和消除NLOS对目标定位的影响,需要提供一个目标的估计位置。以往采用目标前次定位位置的方式存在将前次定位误差引入到当次目标信号处理中的缺陷。为了实现多点定位系统对目标当次信号处理的独立性,采用一种基于最优水平精度因子( HDOP)的目标位置估算方法,利用当次测量达到时间( TOA)信息,基于最优HDOP,通过快速优选、位置一致性判定和优化站点等方法,快速估计出目标当次二维位置,数据处理系统利用当次目标估计位置完成最佳站点组合选择和NLOS处理。仿真测试和机场场面真实数据测试验证了该方法的可行性,同时表明利用该方法提高了多点定位系统的定位连续性和定位精度。