地基伪卫星导航系统的伪距精度估计方法

Evaluation method of pseudo range precision for ground-based pseudolite navigation system

地基伪卫星导航系统的伪距和伪距变率精度对评估系统的导航性能或其信息与其他系统导航信息的融合意义重大。目前的伪距和伪距变率精度估计方法基本上都是针对卫星导航系统的,并且没有充分考虑地基伪卫星导航系统自身的特点。通过构造伪距和伪距变率精度观测量,利用地基伪卫星导航系统可产生较差定位构型的特点,提出了一种在外测系统定位定速精度较差且存在杆臂长度的情况下仍然能够获取准确估计量的伪距和伪距精度估计方法。仿真结果表明所提方法可有效地估计出伪距和伪距变率的精度而且具有较强的适用性。

The pseudo range and the precision of pseudo range variability from ground-based pseudolite navigation system are very important to the navigation performance of evaluation system and the fusion of pseudo range information with the navigation information from other system. At present,the evaluation methods of pseudo range precision are basically aimed for satellite navigation system and they don＇t take full account of the characteristics of ground-based pseudolite navigation system. By constructing the precision observations of pseudo range and its variability and utilizing some bad positioning configurations produced by ground-based pseudolite navigation system,a precision evaluation method for pseudo range and its variability which can get accurate precision estimator even the exterior ballistic measuring system has low position-velocity precision and owns arm length was proposed. The simulation results indicate that the method can evaluate the precision of pseudo range and its variability effectively and has a strong applicability.