G - Physics – 06 – F
Patent
G - Physics
06
F
343/3, 325/6
G06F 11/10 (2006.01) G01S 13/87 (2006.01) H04B 7/185 (2006.01) H04B 17/02 (2006.01)
Patent
CA 1249033
TITLE OF THE INVENTION: Satellite-Based Position Determination and Message Transfer System With Monitoring of Link Quality ABSTRACT OF THE DISCLOSURE: A radio position determination and message transfer system is implemented using a number of satellites in geostationary orbit for relaying interrogation and reply signals between a ground station and a user-carried transceiver. Message information can be exchanged between a given user transceiver and the ground station, as well as between different user transceivers. The user transceiver is provided with means for monitoring the quality of the radio communication link between the transceiver and one or more of the satellites, based on errors detected in the received interrogation signals. The transmission of a reply signal by the transceiver is enabled only when the link quality is found to be acceptable. The reply signal may contain message information or may constitute a request for a position fix. In the latter case, the transceiver may be configured to await favorable link quality to more than one satellite before the reply signal is transmitted.
490180
O'neill Gerard K.
Snively Leslie O.
Geostar Corporation
Gowling Lafleur Henderson Llp
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