Satellite Communications Glossary

Radio XM.  Radio XM is related to other topic areas in the Satellite Communications Glossary: Satellite radio, Satellite radio antenna, XM car radio, Sony XM satellite radio receiver, XM satellite radio, Sony satellite radio, Portable satellite radio.

Rayleigh fading.  Rayleigh fading is fading in a satellite communications channel due to the interference caused to the main signal by the same signal arriving over many different paths, resulting in out-of-phase components incident at the receiver.

Reed-Solomon code (RS code).  The Reed-Solomon code (RS code) is an important subclass of non-binary BCH error-correcting codes in which the encoder operates on multiple bits rather than individual bits.

Relay I.  Relay I was an early satellite communications system. Relay I was launched by NASA on 13 December 1962 into an orbit between 1 310 km and 7 360 km with 47.5 degree inclination.

Retrograde Orbit.  If the satellite is orbiting in the opposite direction to the Earth’s rotation or in the same direction but at an angular velocity less than that of Earth, the orbit is called a retrograde orbit.

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