基于精密时频预测的定位域和测速域RAIM可用性增强算法

RAIM Availability Augmentation Algorithm in Position and Velocity Domain Aided by Precise Forecasted Time and Frequency

能提供精确定位解的观测值集合提供的测速解并不一定是可信的,首先将传统的定位域RAIM算法应用到测速域的完好性监测中,提出将频差预测值用于辅助增强测速域RAIM可用性,使RAIM技术能更好的满足各类用户对导航服务完好性监测的需求。通过对多种预测模型的比较,提出将三阶多项式模型和递推阻尼最小二乘法应用到接收机钟差和频差的在线精密预测算法中,使钟差预测精度提高6倍。克服了传统的钟差辅助增强RAIM可用性算法中对晶振漂移率要求较高的限制,使钟差和频差辅助增强RAIM可用性的方法能更广泛地应用到各类接收机中。

The observation group which can offer accurate position solution will not always offer accurate velocity solution. The traditional RAIM algorithm for position domain is used in the integrity monitoring of velocity domain, and RAIM availability enhancing algorithm by frequency bias for velocity domain is put forward. Thus, RAIM will much satisfy the integrity monitoring demand of navigation services for types of uses. After the comparison of several models, triple-order polynomial and RDLS method are used in time and frequency biases＇ on-line prediction algorithm and the forecasting precision of clock bias is improved about 6 times. Thus, the limitation to crystal oscillator＇s coasting rate in conventional enhancing algorithms is overcome and time and frequency biases aided RAIM enhancing algorithms can be used broadly in types of navigation receivers.