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2. SPOT Satellite Messenger - Wikipedia

   en.wikipedia.org/wiki/SPOT_Satellite_Messenger

   SPOT is a GPS tracking device that uses the Globalstar satellite network [1] to provide text messaging and GPS tracking (depending on the subscription type purchased). [ 2 ] [ 3 ] It has a coverage area that includes a large portion of the planet, with the exception of extreme northern and southern latitudes and parts of the Pacific Ocean. [ 4 ]

3. GPS signals - Wikipedia

   en.wikipedia.org/wiki/GPS_signals

   A GPS receiver processes the GPS signals received on its antenna to determine position, velocity and/or timing. The signal at antenna is amplified, down converted to baseband or intermediate frequency, filtered (to remove frequencies outside the intended frequency range for the digital signal that would alias into it) and digitalized; these ...

4. Global Positioning System - Wikipedia

   en.wikipedia.org/wiki/Global_Positioning_System

   GPS receiver manufacturers design GPS receivers to use spectrum beyond the GPS-allocated band. In some cases, GPS receivers are designed to use up to 400 MHz of spectrum in either direction of the L1 frequency of 1575.42 MHz, because mobile satellite services in those regions are broadcasting from space to ground, and at power levels ...

5. Globalstar - Wikipedia

   en.wikipedia.org/wiki/Globalstar

   The SPOT Messenger is manufactured by Globalstar partner Axonn LLC and combines the company's simplex data technology with a Nemerix GPS chipset. SPOT is intended to leverage Globalstar's still adequate L-Band uplink, which is used by simplex modems. The product was launched in early November 2007.

6. SPOT (satellite) - Wikipedia

   en.wikipedia.org/wiki/SPOT_(satellite)

   Spot-5 Satellite Athens as seen by the SPOT 5 satellite in 2002. SPOT (French: Satellite Pour l’Observation de la Terre, [1] lit. "Satellite for observation of Earth") is a commercial high-resolution optical Earth imaging satellite system operating from space. It is run by Spot Image, based in Toulouse, France.

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