TT&C Antenna Design for LEO Satellite

Topological Design and Routing for Leo Satellite Networks

We investigate a topological design and routing problem for Low-Earth Orbit (LEO) satellite communication networks where each satellite can have a limited number of direct inter-satellite links (ISL's) to a subset of satellites within its line-of-sight. First, we model LEO satellite network as a FSA (Finite State Automaton) using satellite constellation information. Second, we solve a combined ...

Orbital Perturbation Effect on LEO Satellite Trajectory

A satellite, in its orbit, is affected by perturbing forces, such as atmospheric drag, solar radiation pressure, Earth oblateness, and gravity of the celestial masses (other than the Earth). In this paper, the effects of these forces on the trajectories of different types of LEO satellites and a sample satellite (Z-SAT) are discussed. A few analyses are done on these orbits and the relevant res...

Estimation of LEO Satellite

In this paper, we propose a new channel estimation algorithm for low earth orbit satellite digital communications. Low earth orbit satellite channels impart severe spreading in delay and Doppler on the transmitted signal. We model the channel as a tapped-delay-line lter with time-varying complex coeecients. The time evolution of the taps is described by an auto-regressive model. A coupled lter ...

Design of IP-based Routing in a LEO Satellite Network

Routing Issues for Leo Satellite Constellations

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...