Cellular telephone with voice-in-data modem
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United States of America Patent
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Mar 10, 1998
Issued Date -
N/A
app pub date -
Nov 23, 1994
filing date -
Dec 17, 1992
priority date (Note) -
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Abstract
A GPS system has a plurality of satellites transmitting time and location data over radio frequency signals which enable a mobile GPS receiver on the ground to determine its position, includes a source of satellite data message block containing the ephemeris and time modes of the GPS satellites which is independent of the satellites, and an independent cellular telephone channel having a voice channel, a data-in-voice modem including a notch filtering circuit in the voice channel (transmits and receive) and circuits for inserting and retrieving data in and from the notch for accessing said satellite data message block and controller means connecting said satellite message data block to said mobile GPS receiver.
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