US6122506A
Expired / Lapsed
US
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GSM cellular telephone and GPS receiver combination
Assignee: Trimble Inc
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Filing: 1998-05-04
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Granted: 2000-09-19
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Expires: 2018-05-04
Abstract
Abstract A GPS/GSM receiver combination for receiving GSM and GPS signals using an RF GPS integrated circuit for downconverting the GPS signal. The GPS integrated circuit includes a synthesizer for generating LO signals, first and second downconverters for using the LO signals for downconverting the GPS signal, and a sampler for providing in-phase and quadrature phase sampled output signals representative of the GPS signal. The synthesizer includes a multi-mode divider for providing substantially the same first LO frequency at about the midpoint of the L1 and L2 GPS frequencies when either of a standard GSM reference frequency or historically common GPS reference frequency is selected. A standby mode in the integrated circuit is controlled by a power logic circuit using a power supply input as a logic control signal. The GSM/GPS receiver combination includes a GSM reference oscillator and a microprocessor system including a GSM frequency correction code for correcting the GSM reference frequency based upon a frequency correction beacon (FCB) signal received in the GSM signal. The GSM-based correction is then used for correcting the GSM reference frequency in order to center a frequency search for acquiring the GPS signal.
Inventors
- 👤 Chung Y. Lau
- 👤 Reed A. Parker
- 👤 Eric B. Rodal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:25
CPC Classifications
G; G01; G01S; G01S19/00; G01S19/01; G01S19/13; G01S19/35; G01S19/36; G01S19/23; G01S19/235; H; H03; H03D; H03D7/00; H03D7/16; H03D7/165; H04; H04B; H04B1/00; H04B1/005; H04B1/0053; H04B1/0057; H04B1/38; H04B1/3805; H04B1/40; H04B1/403; H04B1/406; H03L; H03L7/00; H03L7/06; H03L7/16; H03L7/18; H03L7/197; H03L7/1974
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
159 words
A GSM/GPS receiver combination for receiving a global system for mobile telecommunications (GSM) signal including a frequency correction beacon (FCB) signal and information for a GSM communication, and a global positioning system (GPS) signal including information for a GPS location, the GSM/GPS receiver combination comprising: a GSM reference oscillator for providing a GSM reference signal having a GSM reference frequency; a GSM receiver for using said GSM reference signal for receiving said GSM signal and providing said GSM communication; an executable GSM frequency correction code for directing the GSM receiver for using said FCB signal and said GSM reference frequency for calculating a GSM-based frequency correction; a GPS receiver for using said GSM reference signal and said GSM-based frequency correction for receiving said GPS signal and providing a GPS correlation signal; and a microprocessor system for executing said GSM frequency correction code and cooperating with the GPS receiver for processing said GPS correlation signal for providing said GPS location.
Claim 2
Dependent Claim
159 words
A GSM/GPS receiver combination for receiving a global system for mobile telecommunications (GSM) signal including a frequency correction beacon (FCB) signal and information for a GSM communication, and a global positioning system (GPS) signal including information for a GPS location, the GSM/GPS receiver combination comprising: a GSM reference oscillator for providing a GSM reference signal having a GSM reference frequency; a GSM receiver for using said GSM reference signal for receiving said GSM signal and providing said GSM communication; an executable GSM frequency correction code for directing the GSM receiver for using said FCB signal and said GSM reference frequency for calculating a GSM-based frequency correction; a GPS receiver for using said GSM reference signal and said GSM-based frequency correction for receiving said GPS signal and providing a GPS correlation signal; and a microprocessor system for executing said GSM frequency correction code and cooperating with the GPS receiver for processing said GPS correlation signal for providing said GPS location.
Claim 3
Dependent Claim
39 words
The receiver combination of claim 1, wherein: the GPS receiver includes a GPS digital signal processing (DSP) section for using said GSM reference frequency and said GSM-based frequency correction for centering a frequency search for acquiring said GPS signal.
Claim 4
Dependent Claim
15 words
The receiver combination of claim 1, wherein: said GSM reference frequency is about thirteen megahertz.
Claim 5
Independent Claim
125 words
A method for receiving a global system for mobile telecommunications (GSM) signal including a GSM frequency correction beacon (FCB) signal and information for a GSM communication, and a global positioning system (GPS) signal including information for a GPS location in a GSM/GPS receiver combination, the method comprising steps of: generating a GSM reference signal having a GSM reference frequency; using said GSM reference signal for receiving said GSM signal and providing said GSM communication information; comparing said GSM reference frequency to a frequency of said FCB signal for providing a GSM-based frequency correction; using said GSM reference signal and said GSM-based frequency correction for receiving said GPS signal and providing a GPS correlation signal; and processing said GPS correlation signal for providing said GPS location.
Claim 6
Independent Claim
125 words
A method for receiving a global system for mobile telecommunications (GSM) signal including a GSM frequency correction beacon (FCB) signal and information for a GSM communication, and a global positioning system (GPS) signal including information for a GPS location in a GSM/GPS receiver combination, the method comprising steps of: generating a GSM reference signal having a GSM reference frequency; using said GSM reference signal for receiving said GSM signal and providing said GSM communication information; comparing said GSM reference frequency to a frequency of said FCB signal for providing a GSM-based frequency correction; using said GSM reference signal and said GSM-based frequency correction for receiving said GPS signal and providing a GPS correlation signal; and processing said GPS correlation signal for providing said GPS location.
Claim 7
Dependent Claim
44 words
The method of claim 4, wherein: said step of using said GSM reference signal and said GSM-based frequency correction for receiving said GPS signal includes using said GSM reference frequency and said GSM-based frequency correction for centering a frequency search for said GPS signal.
Claim 8
Dependent Claim
15 words
The method of claim 4, wherein: said standard GSM reference frequency is about thirteen megahertz.
Claim 9
Dependent Claim
146 words
A GSM/GPS receiver combination for receiving a global system for mobile telecommunications (GSM) signal including information for a GSM communication and a global positioning system (GPS) signal including information for a GPS location, comprising: a GSM reference oscillator for providing a GSM reference signal; a GSM receiver for using said GSM reference signal for receiving said GSM signal having a GSM reference frequency and providing said GSM communication; a GPS receiver for receiving said GPS signal, the GPS receiver including a circuit for selecting a reference signal of one of (i) said GSM reference signal and (ii) a second reference signal having a second reference frequency not equal to said GSM reference frequency and using said selected reference signal for providing a GPS correlation signal; and a microprocessor system for cooperating with the GPS receiver for processing said GPS correlation signal for providing said GPS location.
Claim 10
Dependent Claim
146 words
A GSM/GPS receiver combination for receiving a global system for mobile telecommunications (GSM) signal including information for a GSM communication and a global positioning system (GPS) signal including information for a GPS location, comprising: a GSM reference oscillator for providing a GSM reference signal; a GSM receiver for using said GSM reference signal for receiving said GSM signal having a GSM reference frequency and providing said GSM communication; a GPS receiver for receiving said GPS signal, the GPS receiver including a circuit for selecting a reference signal of one of (i) said GSM reference signal and (ii) a second reference signal having a second reference frequency not equal to said GSM reference frequency and using said selected reference signal for providing a GPS correlation signal; and a microprocessor system for cooperating with the GPS receiver for processing said GPS correlation signal for providing said GPS location.
Claim 11
Dependent Claim
88 words
The receiver combination of claim 7, wherein: the GPS receiver includes a synthesizer for generating a local oscillator (LO) signal from said selected reference signal, said LO signal having substantially the same frequency for either of (i) said GSM reference signal and (ii) said second reference signal; a downconverter using said LO signal for downconverting said GPS signal and providing a downconverter output signal; and a GPS digital signal processor (DSP) for using said downconverter output signal and said selected reference signal for providing said GPS correlation signal.
Claim 12
Dependent Claim
28 words
The receiver combination of claim 8, wherein: said LO signal has a frequency approximately the midpoint of an L1 frequency and an L2 frequency of said GPS signal.
Claim 13
Dependent Claim
103 words
The receiver combination of claim 8, wherein: said synthesizer includes a phase detector coupled to the amplifier/oscillator for receiving said selected reference signal and providing an error signal corresponding to a phase difference between said selected reference signal and a feedback signal; a local oscillator for providing said LO signal having an LO frequency corresponding to said error signal; and a multi-mode divider for frequency dividing said LO signal by a selected one of a first divide number for providing said feedback signal having said GSM reference frequency or a second divide number for providing said feedback signal having said second reference frequency.
Claim 14
Dependent Claim
39 words
The receiver combination of claim 10, wherein: at least one of said first divide number and said second divide number has an average of a ratio having an integer numerator and an integer denominator, said denominator greater than one.
Claim 15
Dependent Claim
58 words
The receiver combination of claim 10, wherein: said multi-mode divider is further for providing said average divide number by alternating a divide number A N band a divide number B N in repeating sequences, each of said sequences beginning in said divide number A N and ending in said divide number A N for providing said feedback signal.
Claim 16
Dependent Claim
24 words
The receiver combination of claim 12, wherein: at least one of said first divide number and said second divide number is an integer number.
Claim 17
Dependent Claim
89 words
The receiver combination of claim 8, wherein: said LO signal includes a first LO signal and a complex second LO signal at a sub-multiple of said first LO signal; and said downconverter includes a first downconverter for using said first LO signal for providing a first intermediate frequency (IF) signal, a second downconverter for using said second LO signal for providing a complex second IF signal, and a sampler for sampling said second IF signal for providing said downconverter output signal having in-phase (I) and quadrature phase (Q) components.
Claim 18
Independent Claim
123 words
A method for receiving a global system for mobile telecommunications (GSM) signal including information for a GSM communication and a global positioning system (GPS) signal including information for a GPS location in a GSM/GPS receiver combination, comprising steps of: generating a GSM reference signal having a GSM reference frequency; using said GSM reference signal for receiving said GSM signal and providing said GSM communication information; selecting a reference signal from one of (i) said GSM reference signal and (ii) a second reference signal having a second reference frequency not equal to said GSM reference frequency; and using said selected reference signal for receiving said GPS signal and providing a GPS correlation signal; and processing said GPS correlation signal for providing said GPS location.
Claim 19
Independent Claim
123 words
A method for receiving a global system for mobile telecommunications (GSM) signal including information for a GSM communication and a global positioning system (GPS) signal including information for a GPS location in a GSM/GPS receiver combination, comprising steps of: generating a GSM reference signal having a GSM reference frequency; using said GSM reference signal for receiving said GSM signal and providing said GSM communication information; selecting a reference signal from one of (i) said GSM reference signal and (ii) a second reference signal having a second reference frequency not equal to said GSM reference frequency; and using said selected reference signal for receiving said GPS signal and providing a GPS correlation signal; and processing said GPS correlation signal for providing said GPS location.
Claim 20
Dependent Claim
69 words
The method of claim 15, wherein: the step of receiving said GPS signal further includes steps of: generating a local oscillator (LO) signal from said selected reference signal, said LO signal having substantially the same frequency for either of (i) said GSM reference signal and (ii) said second reference signal; using said LO signal for downconverting said GPS signal and deriving said GPS correlation signal from said downconverted signal.
Claim 21
Dependent Claim
27 words
The method of claim 16, wherein: said LO signal has a frequency approximately the midpoint of an L1 frequency and an L2 frequency of said GPS signal.
Claim 22
Dependent Claim
81 words
The method of claim 16, wherein: said step of generating said LO signal includes steps of phase comparing said selected reference signal to a feedback signal for providing an error signal; using said error signal for generating said LO signal; and frequency dividing said LO signal by a selected one of a first divide number for providing said feedback signal having said GSM standard reference frequency or a second divide number for providing said feedback signal having said second reference frequency.
Claim 23
Dependent Claim
38 words
The method of claim 18, wherein: at least one of said first divide number and said second divide number has an average of a ratio having an integer numerator and an integer denominator, said denominator greater than one.
Claim 24
Dependent Claim
57 words
The method of claim 19, wherein: said step of frequency dividing said LO signal includes a step of frequency dividing by alternating a divide number A N and a divide number B N in repeating sequences where each of said sequences begins in said divide number A N and ends in said divide number A N .
Claim 25
Dependent Claim
23 words
The method of claim 20, wherein: at least one of said first divide number and said second divide number is an integer number.
Claim 26
Dependent Claim
84 words
The method of claim 16, wherein: said LO signal includes a first LO signal and a complex second LO signal at a sub-multiple of said first LO signal; and said step of downconverting said GPS signal includes steps of: using said first LO signal for providing a first intermediate frequency (IF) signal; using said second LO signal for providing a complex second IF signal; and sampling said second IF signal for providing said downconverter output signal having in-phase (I) and quadrature phase (Q) components.
References Cited (Backward Citations)
US5119504A
Cited
US5365450A
Cited
US5535432A
Cited
US5812591A
Cited
EP0745867A1
Cited
WO1997014056A1
Cited
GB2307812A
Cited
US5841396A
Cited
US5663735A
Cited
US5877724A
Cited
WO1999013595A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-09-19 | 2004-03-20 | 2004-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-09-19 | 2008-03-20 | 2008-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-09-19 | 2012-03-20 | 2012-09-19 | $7700.00 | Window Closed / Lapsed |