To analyze the detection probability of shipborne AIS (automatic identification system) signal from space, a mathematical model dependent upon three factors of message collision avoidance, power of signal received by satellite and interference ratio of signal received is presented in the paper. The altitude and footprint area of the AIS satellite are discussed to overcome the collision of messa...

The implementation of an IP based worldwide network needs the availability of a very efficient satellite segment in order to achieve real global coverage. To this aim the satellite component shall provide flexibility and high link availability. Satellite systems based on the use of geostationary (GEO) or Low Earth Orbit (LEO) constellations suffer from their intrinsic limitations in terms of co...

Low-Earth Orbit (LEO) satellite systems are intended to have an important part of the future generation of mobile telecommunication systems. They aim to provide diierent services to various populations of users. Each class of users requires a certain Quality of Service (QoS) and thus a given part of the shared channel resource. In this paper, LEO satellite systems based on an earth-xed cell con...

This three-day course is designed for satellite communications engineers, spacecraft engineers, and managers who want to obtain an understanding of the “big picture” of satellite communications. Each topic is illustrated by detailed worked numerical examples, using published data for actual satellite communications systems. The course is technically oriented and includes mathematical derivation...

We present diierent issues of routing in LEO satellite constellations. The nature of the problem itself needs further explanations. The exact market of these systems lets many questions open, although some models have been advanced. The structure of the ISLs vary from one design to another and impacts signiicantly the optimization. The movement of the satellites also gives to the system a dynam...

Several strategies have been proposed for routing in the Low Earth Orbit (LEO) satellite networks. The multi-layered routing approaches are envisioned as promising because they use Middle Earth Orbit (MEO) satellite to extend the LEO satellite network’s communication capabilities. The previously proposed multi-layered routing approaches, however, still assume that the satellites in the same lay...