05726893 is referenced by 154 patents and cites 43 patents.

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.

Title
Cellular telephone with voice-in-data modem
Application Number
992892
Publication Number
5726893
Application Date
November 23, 1994
Publication Date
March 10, 1998
Inventor
Charles Moses
Catonsville
MD, US
Ronald Bruno
Arlington
VA, US
Leonard Schuchman
Potomac
MD, US
Agent
Jim Zegeer Esq
Assignee
Stanford Telecommunications
VA, US
IPC
H03C 1/00
G01S 3/02
G06G 7/78
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