Digital satellite system

Dupay, A., Leveson, N., October 2000. An Empirical Evaluation of the MCDC Coverage Criterion on the HETE-2 Satellite Software. Proceedings of the Digital Aviation Systems Conference, Philadelphia, USA. 

Navigation systems record the position of a vehicle using satellite-based location systems (GPS) and match the determined position with the navigation system s digital street map. Yaw-rate sensors, in combination with wheel-speed sensors, permit interpolation in situations where no satellite reception is possible, such as when driving through tunnels or if the GPS signals cannot be clearly interpreted due to multiple reception as a result of reflections from houses in urban situations, for example. 

High-power direct broadcast satellites (DBS) or direct-to-home (DTH) satellites operate atKu-band. In the U.S., satellites operating in the broadcast sateUite service (BSS) with downlink frequencies of 12.2-12.7 GHz, deliver TV directly to home receivers having parabolic dish antennas as small as 46 cm (18 in) in diameter. DBS with digital modulation and compressed video is providing more than 150 National Television Systems Committee (NTSC) TV channels from a single orbital location having an allocation of 32 transponder channels, each with 24-MHz bandwidth. 

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