Cellular telephone with voice-in-data modem

• US 5,726,893 A
• Filed: 11/23/1994
• Issued: 03/10/1998
• Est. Priority Date: 12/17/1992
• Status: Expired due to Term

• Current Assignee: Exelis Incorporated (L3Harris Technologies, Inc.)
• Original Assignee: Stanford Telecommunications, Inc. (Nokia Corporation)
• Inventors: Moses, Charles, Schuchman, Leonard, Bruno, Ronald
• Primary Examiner(s): LOUIS JACQUES, JACQUES H
• Application Number:
  US08/348,081
• Time in Patent Office: 1,203 Days
• Field of Search: 364/443, 364/444, 364/449, 364/450, 364/454, 364/460, 364/459, 364/726, 342/457, 342/458, 342/387, 342/357, 342/356, 342/463-465, 340/572, 340/990, 340/995, 340/998, 455/33.1, 455/43, 455/93-95, 455/38.5, 455/67.6, 455/152.1, 455/54.1, 455/306-311, 455/56.1, 455/53.1, 455/33.3, 455/235.1, 455/249.1, 379/58, 379/60, 379/59, 379/410, 379/406, 379/496, 379/497, 379/93, 379/98, 348/16-18, 375/219, 375/222, 375/377, 375/324, 375/334, 370/329, 370/330, 370/336, 370/343, 370/344, 370/380, 370/494, 370/493, 370/340, 370/341, 370/495
• US Class Current: 455/456.3
• CPC Class Codes: G01S 19/235 Calibration of receiver components
• CPC Class Codes: G01S 19/258 relating to the satellite constellation, e.g. almanac, ephemeris data, lists of satellites in view
• CPC Class Codes: G01S 19/29 carrier including Doppler, related G01S19/246 takes precedence
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0009 Transmission of position information to remote stations involving assistance data G01S5/0236
• CPC Class Codes: G01S 5/0027 of actual mobile position, i.e. position determined on mobile
• CPC Class Codes: G01S 5/021 Calibration, monitoring or correction G01S5/0252 takes precedence
• CPC Class Codes: H04B 7/18552 using a telephonic control signal and a second ranging satellite determining absolute distances from a plurality of spaced points of known location G01S5/14

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.

Claims

1. A modem for use in a cellular mobile subscriber telephone in a cellular telephone system having one or more cell sites servicing a plurality of cellular mobile subscriber telephones, said modem comprising a transmit channel and a receive channel, each of said channels having first filter means to receive voice signals and second filter means to transmit voice signals on said transmit channel, said second filter means having only one frequency notch in said transmit and receive channels;

an interface for receiving binary data from a source of G.P.S. data;

means to transmit said binary data from said source within said only one frequency notch, and mode control means for selectively enabling said source of binary data and said only one frequency notch to allow data to be transmitted.

2. The modem defined in claim 1 wherein said binary data is constituted by a plurality of frequency shift keyed (FSK) tones and said FSK tones are about 1650 Hz and about 1959 Hz, respectively.

3. The modem defined in claim 1 wherein said second filter means in said transmit and receive channels are digital filters.

4. The modem defined in claim 1 wherein said modem is mounted in the trunk of a vehicle, and said cellular mobile telephone is coupled to said modem by a radio link.

5. In a position location system wherein a plurality of radio stations transmit time and location data over radio frequency signals which enable a mobile position location receiver on the ground to determine its position and generate location data signals, the improvement comprising:

said mobile position location system including a modem, said modem including

a transmit portion which receives voice data, and a tone generator for receiving data for transmission, a bandstop filter for providing a frequency notch in said voice channel, summer means connected to said tone generator and said bandstop filter for combining said location data signals with said voice data and;

receive portion having a filter delay line for receiving combined voice and data signals on said modem, a bandstop filter for extracting the data signals, and a data decisions circuit connected to the bandstop filter for comparing and smoothing said data signals; and

a digital mode control means for selectively controlling said bandstop filters in said transmit and receive portions of said modem.

6. A modem for use in a subscriber telephone in a cellular telephone system having one or more cell sites servicing a plurality of subscriber telephones with data utilization devices, said modem comprising transmit and receive channels, said receive channel comprising a first filter delay line to receive voice and data signals, a first bandstop filter for transmitting a voice input to said subscriber telephones and data signals to said data utilization devices, respectively;

said transmit channel having a second filter delay line connected to receive voice signals from said cellular telephone, a second bandstop filter connected to said filter delay line for providing a frequency notch in said voice signals from said cellular phones;

an interface for receiving;

of binary data from a source of G.P.S. data; and

means for converting to binary data from said source of binary data to tone signals and for transmitting said tone signals within said frequency notch and;

control means for converting for selectively controlling said first and second bandstop filters to allow data to be transmitted and received in said transmit and receive channels, respectively.