Abstract This article introduces a billing method of pre-paid and post-paid transportation satellite short message service. It aims to solve the problem that handheld equipment in China cannot use SMS service due two staged dial prepaid system can’t charge bill. The platform is connected with business support system, uses time series prediction algorithm Prophet capture early warning abnormal e...

the recent dedicated satellite gravimetry missions have provided huge amount of high quality gravity data with global coverage. from computational point of view, estimation of the unknown gravity field parameters is a highly demanding task due to the sheer number of observations and the unknown coefficients. different computational schemes have been proposed to tackle the problem. since the ear...

Small satellites have limited payload and their attitudes are sometimes difficult to determine from the limited onboard sensors alone. Wrong attitudes lead to inaccurate map projections and measurements that require post-processing correction. In this study, we propose an automated and robust scheme that derives the satellite attitude from its observation images and known satellite position by ...

The need to cope with the mobility of users is very different between mobile and fixed communication systems. Mobility management is thus a key feature in the design of mobile systems. Techniques derived for terrestrial mobile systems cannot be used for mobile satellite systems that use constellations of satellites. A major theme of this thesis is the proposal and verification of such mobility ...