US6064336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
GPS receiver utilizing a communication link
Assignee: SnapTrack Inc
•
Filing: 1998-08-05
•
Granted: 2000-05-16
•
Expires: 2018-08-05
Abstract
Abstract A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit.
Inventors
- 👤 Norman F. Krasner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:52
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/0003; H04B1/0007; G; G01; G01S; G01S19/00; G01S19/01; G01S19/03; G01S19/05; G01S19/06; G01S19/09; G01S19/13; G01S19/23; G01S19/235; G01S19/24; G01S19/25; G01S19/252; G01S19/254; G01S19/256; G01S19/258; G01S19/29; G01S19/34; G01S19/35; G01S19/37; G01S19/38; G01S19/39; G01S19/42; G01S19/45; G01S19/46; G01S5/00; G01S5/0009; G01S5/0018; G01S5/0036; G01S5/009; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/273; H01Q21/00; H01Q21/28; H03; H03J; H03J7/00; H03J7/02; H03J7/04; H03J7/047; H03J7/06; H04B1/06; H04B1/16; H04B1/26; H04B1/28; H04B1/38; H04B1/3805; G01S19/10; G01S19/11; G01S2205/00; G01S2205/001; G01S2205/008; G01S5/0045; G06; G06F; G06F2221/00; G06F2221/21; G06F2221/2111; H03D; H03D7/00; H03D7/16; H03D7/161; H03D7/163; H03J2200/00; H03J2200/11
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
68 words
In a method for determining the position of a remote unit, a process comprising: receiving, at said remote unit, a satellite almanac information for a plurality of satellites in view of said remote unit from a source other than a Satellite Positioning System satellite; and computing, in said remote unit, a position information for said remote unit by using a Doppler information derived from said satellite almanac information.
Claim 2
Dependent Claim
68 words
In a method for determining the position of a remote unit, a process comprising: receiving, at said remote unit, a satellite almanac information for a plurality of satellites in view of said remote unit from a source other than a Satellite Positioning System satellite; and computing, in said remote unit, a position information for said remote unit by using a Doppler information derived from said satellite almanac information.
Claim 3
Dependent Claim
24 words
A process as in claim 1, further comprising: transmitting said satellite almanac information from a basestation, which is said source, to said remote unit.
Claim 4
Dependent Claim
21 words
A process as in claim 2 wherein said satellite almanac information is obtained from a reference storage medium at said basestation.
Claim 5
Dependent Claim
23 words
A process as in claim 2 wherein said position information comprises pseudoranges to a plurality of satellites in view of said remote unit.
Claim 6
Dependent Claim
23 words
A process as in claim 2 wherein said position information comprises a latitude and longitude which indicates the position of said remote unit.
Claim 7
Dependent Claim
35 words
A process as in claim 4 further comprising: transmitting said pseudoranges from said remote unit to said basestation, and wherein said basestation computes a latitude and longitude which indicates the position of said remote unit.
Claim 8
Dependent Claim
33 words
A process as in claim 4 further comprising transmitting satellite data information to said remote unit, said satellite data information comprising data representative of ephemeris for satellites in view of said remote unit.
Claim 9
Dependent Claim
33 words
A process as in claim 5 further comprising transmitting satellite data information to said remote unit, said satellite data information comprising data representative of ephemeris for satellites in view of said remote unit.
Claim 10
Dependent Claim
30 words
A process as in claim 1 wherein a processing unit uses said Doppler information to compensate for a Doppler shift of Satellite Positioning System (SPS) signals from an SPS satellite.
Claim 11
Dependent Claim
113 words
A mobile unit which uses data representative of Satellite Positioning System (SPS) signals to provide the position of said mobile unit, said mobile unit comprising: a receiver in said mobile unit, said receiver operable for coupling through a communications link to receive a satellite almanac information for a plurality of satellites in view of said mobile unit wherein said satellite almanac is received from a source other than a satellite positioning system satellite; a processing unit in said mobile unit, said processing unit coupled to said receiver to receive said satellite almanac information and compute a position information for said mobile unit by using a Doppler information derived from said satellite almanac information.
Claim 12
Dependent Claim
113 words
A mobile unit which uses data representative of Satellite Positioning System (SPS) signals to provide the position of said mobile unit, said mobile unit comprising: a receiver in said mobile unit, said receiver operable for coupling through a communications link to receive a satellite almanac information for a plurality of satellites in view of said mobile unit wherein said satellite almanac is received from a source other than a satellite positioning system satellite; a processing unit in said mobile unit, said processing unit coupled to said receiver to receive said satellite almanac information and compute a position information for said mobile unit by using a Doppler information derived from said satellite almanac information.
Claim 13
Dependent Claim
31 words
A mobile unit as in claim 10 wherein said processing unit uses said Doppler information to compensate for a Doppler shift of Satellite Positioning System (SPS) signals from an SPS satellite.
Claim 14
Dependent Claim
17 words
A mobile unit as in claim 11 wherein said communications link comprises a radio frequency communication medium.
Claim 15
Dependent Claim
23 words
A mobile unit as in claim 11 further comprising; a transmitter coupled to said processing unit, said transmitter for transmitting said position information.
Claim 16
Dependent Claim
24 words
A mobile unit as in claim 13 wherein said position information comprises pseudorange to said plurality of satellites in view of said mobile unit.
Claim 17
Dependent Claim
24 words
A mobile unit as in claim 13 wherein said position information comprises a latitude and longitude which indicates the position of said mobile unit.
Claim 18
Dependent Claim
36 words
A mobile unit as in claim 11 wherein said processing unit comprises a digital signal processing integrated circuit (DSP) and wherein said DSP processes said SPS signals and said Doppler information using a fast convolution algorithm.
Claim 19
Dependent Claim
23 words
A mobile unit as in claim 16 further comprising: a transmitter coupled to said processing unit, said transmitter for transmitting said position information.
Claim 20
Dependent Claim
54 words
A mobile unit as in claim 10 wherein said receiver is operable to receive satellite data information of one of said plurality of satellites from a source other than said one of said plurality of satellites, wherein said satellite data information comprises data representative of ephemeris for said one of said plurality of satellites.
Claim 21
Independent Claim
52 words
A method of using a basestation for providing a communications link to a mobile GPS unit, said method comprising: determining a satellite almanac information for a plurality of satellites in view of said mobile GPS unit; transmitting said satellite almanac information to said mobile GPS unit for determination of a Doppler information.
Claim 22
Independent Claim
52 words
A method of using a basestation for providing a communications link to a mobile GPS unit, said method comprising: determining a satellite almanac information for a plurality of satellites in view of said mobile GPS unit; transmitting said satellite almanac information to said mobile GPS unit for determination of a Doppler information.
Claim 23
Dependent Claim
25 words
A method as in claim 19, wherein said Doppler information represents the Doppler shift of GPS signals from one of said satellites to said basestation.
Claim 24
Dependent Claim
29 words
A method as in claim 20 wherein said Doppler information approximately represents the Doppler shift of GPS signals from said one of said satellites to said mobile GPS unit.
Claim 25
Dependent Claim
39 words
A method as in claim 19 wherein said Doppler information is obtained from a GPS receiver at said basestation and wherein said Doppler information represents the Doppler shift of GPS signals from said plurality of satellites to said basestation.
Claim 26
Dependent Claim
28 words
A method as in claim 22 wherein said Doppler information approximately represents the Doppler shift of GPS signals from said plurality of satellites to said mobile GPS unit.
Claim 27
Dependent Claim
43 words
A method as in claim 23 further comprising: receiving a position information from said mobile GPS unit, said position information being received at said basestation such that said basestation obtains a latitude and longitude which indicates the position of said mobile GPS unit.
Claim 28
Dependent Claim
36 words
A method as in claim 24 wherein said position information comprises pseudoranges to said plurality of satellites in view of said mobile GPS unit, and wherein said basestation computes said latitude and longitude from said pseudoranges.
Claim 29
Dependent Claim
15 words
A method as in claim 24 wherein said position information comprises said latitude and longitude.
Claim 30
Dependent Claim
36 words
A method as in claim 19 further comprising: transmitting satellite data information of said plurality of satellites to said mobile GPS unit, said satellite data information comprising data representative of ephemeris for said plurality of satellites.
Claim 31
Dependent Claim
68 words
A basestation for providing a communication link to a mobile GPS unit, said basestation comprising: a source of a satellite almanac information for a plurality of satellites in view of said mobile GPS unit; a transmitter coupled to said source of said satellite almanac information, said transmitter for transmitting through said communication link said satellite almanac information to said mobile GPS unit for determination of a Doppler information.
Claim 32
Dependent Claim
68 words
A basestation for providing a communication link to a mobile GPS unit, said basestation comprising: a source of a satellite almanac information for a plurality of satellites in view of said mobile GPS unit; a transmitter coupled to said source of said satellite almanac information, said transmitter for transmitting through said communication link said satellite almanac information to said mobile GPS unit for determination of a Doppler information.
Claim 33
Dependent Claim
22 words
A basestation as in claim 28 wherein said source of said satellite almanac information is a storage unit coupled to said basestation.
Claim 34
Dependent Claim
26 words
A basestation as in claim 28 further comprising: a receiver for receiving a position information from said mobile GPS unit; a processor coupled to said receiver.
Claim 35
Dependent Claim
26 words
A basestation as in claim 28, wherein said Doppler information approximately represents the Doppler shift of GPS signals from one of said satellites to said basestation.
Claim 36
Dependent Claim
33 words
A basestation as in claim 30, wherein said position information is received at said basestation such that said basestation obtains a latitude and longitude which indicates the position of said mobile GPS unit.
Claim 37
Dependent Claim
43 words
A basestation as in claim 32, wherein said position information comprises pseudoranges to at least some of said plurality of satellites in view of said mobile GPS unit, and wherein said processor of said basestation computes said latitude and longitude from said pseudorange.
Claim 38
Dependent Claim
40 words
A basestation as in claim 28 wherein said transmitter is also for transmitting satellite data information of said satellites in view to said mobile GPS unit, said satellite data information comprising data representative of ephemeris for said satellites in view.
Claim 39
Dependent Claim
22 words
A basestation as in claim 31 wherein said basestation and said mobile GPS unit are within approximately 150 kilometers of each other.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-05-16 | 2003-11-15 | 2004-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-16 | 2007-11-15 | 2008-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-16 | 2011-11-15 | 2012-05-16 | $7700.00 | Window Closed / Lapsed |