灰色模型在快速卫星钟差预报中的应用

GPS实时精密单点定位需要实时的、精确的、可靠的预报卫星钟差预报,因此卫星钟差的预报是一项非常重要的工作,它对实时的高精度导航定位具有重要意义。为导航定位提供时间标准的导航卫星原子钟是非常精密的仪器,对外界环境非常敏感,无法将卫星钟差作为普通的白噪声处理,可以但可将卫星钟差看作是灰色系统来进行研究。本文根据灰色系统相关理论,将灰色系统模型GM(1,1)应用到卫星钟差的预报,并用IGS超快速星历建立了预报卫星钟差的灰色预测模型,研究了卫星钟差的变化规律。结果表明:灰色模型可用于卫星钟差的短期预报,它对超快速星历的预报精度与IGS产品中的IGU超快速星历本身的预报精度相当。

Grey system model for the ultra-rapid satellite clock error predicting

GPS real time precise point positioning ( RT- ) requires real-time, accurate and reliable prediction of satellite clock biases (SCBs). This is one of the most challenging tasks in the development of a RT- technique. The satellite atomic clock provicting time standard for navigation is a precise instrument and sensible to environment. It is supposed to regard satellite clock bias as grey model. Based on the grey system theory, the grey system model GM (1,1) was applied in establishing a grey predicting model by making use of IGS ultra-rapid products. Calculating results showed that grey model was fit for satellite clock bias short-term predicting, the predicting accuracy of satellite clock bias with ultra-rapid products was comparable with IGU products.