US6081229A
Expired / Lapsed
US
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System and method for determining the position of a wireless CDMA transceiver
Assignee: Qualcomm Inc
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Filing: 1998-03-17
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Granted: 2000-06-27
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Expires: 2018-03-17
Abstract
Abstract A system and method for determining a position of a mobile wireless transceiver. The inventive system merges GPS position location and wireless communication technologies to achieve a precise position location in dense urban and other environments when line-of-sight to the satellites is somewhat obscured. The inventive method uses signals from only two GPS satellites and the serving terrestrial base station. In a most general sense, the inventive method includes the steps of receiving at a base station a first signal transmitted from a first GPS satellite and a second signal transmitted from a second GPS satellite. The mobile transceiver is adapted to receive these GPS signals as well and transmit a third signal to the base station in response thereto. The base station receives the third signal and uses it to calculate the position of the wireless unit. In a specific implementation, the base station sends aiding information to the wireless unit. The aiding information is used by the wireless unit to quickly acquire the signals transmitted by the first and second satellites and includes satellite identification information, Doppler shift information, and range information between the base station and the satellites. On the acquisition by the wireless unit of the signals transmitted by the first and second satellites, the wireless unit wireless unit calculates the range between the wireless unit and each of the satellites. This range information is transmitted back to the base station along with information as to the time at which the measurement was made. In a CDMA implementation, the time at which the wireless unit transmits the third signal to the base station is known by the base station. The delay in the receipt of the third signal provides an indication to the base station as to the range between the base station and the wireless unit. The base station utilizes information known as to its position, the position of the first and second satellites relative to the wireless unit and the range to the wireless unit from the base station to calculate the position of the wireless unit.
Inventors
- 👤 Samir S. Soliman
- 👤 Klein S. Gilhousen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:34
CPC Classifications
G; G01; G01S; G01S5/00; G01S5/0009; G01S5/0045; G01S5/0054; G01S19/00; G01S19/01; G01S19/13; G01S19/23; G01S19/235; G01S19/24; G01S19/25; G01S19/254; G01S19/256; G01S19/38; G01S19/39; G01S19/42; G01S19/45; G01S19/46; G01S5/009; G01S5/02; G01S5/0205; G01S5/021; G04; G04G; G04G7/00; G04G7/02; H; H04; H04W; H04W64/00; G01S2205/00; G01S2205/001; G01S2205/008; G01S5/0236
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
210 words
A system for determining a position of a mobile wireless transceiver comprising: a base station; means for calculating a Doppler shift of signals transmitted from first, second and third satellites, respectively, relative to the base station; means for calculating a first set of pseudo ranges of the first and second satellites, respectively, relative to said base station; means for sending satellite identification information, Doppler shift information, and said pseudo range information between said base station and said wireless transceiver; means disposed at said wireless transceiver for receiving said satellite identification information, Doppler shift information, and said pseudo range information from said base station; means disposed at said mobile wireless transceiver for utilizing said information received from said base station to identify a second set of pseudo ranges between said transceiver and said first and second satellites, respectively, at a time T; means disposed at said mobile wireless transceiver for sending to said base station said second set of pseudo ranges between said transceiver and said first and second satellites, respectively, along with time information for the time T; and means disposed at the base station for calculating the position of said wireless transceiver in response to said second set of pseudo ranges and said time information for the time T.
Claim 2
Independent Claim
210 words
A system for determining a position of a mobile wireless transceiver comprising: a base station; means for calculating a Doppler shift of signals transmitted from first, second and third satellites, respectively, relative to the base station; means for calculating a first set of pseudo ranges of the first and second satellites, respectively, relative to said base station; means for sending satellite identification information, Doppler shift information, and said pseudo range information between said base station and said wireless transceiver; means disposed at said wireless transceiver for receiving said satellite identification information, Doppler shift information, and said pseudo range information from said base station; means disposed at said mobile wireless transceiver for utilizing said information received from said base station to identify a second set of pseudo ranges between said transceiver and said first and second satellites, respectively, at a time T; means disposed at said mobile wireless transceiver for sending to said base station said second set of pseudo ranges between said transceiver and said first and second satellites, respectively, along with time information for the time T; and means disposed at the base station for calculating the position of said wireless transceiver in response to said second set of pseudo ranges and said time information for the time T.
Claim 3
Dependent Claim
52 words
The invention of claim, 1 wherein said means disposed at the base station for calculating the position of said wireless transceiver in response to said second set of pseudo ranges and said time information for the time T includes means for determining the distance of said wireless transceiver from said base station.
Claim 4
Dependent Claim
45 words
The invention of claim 2 wherein said means disposed at the base station for calculating the position of said wireless transceiver includes means for utilizing the distance of said wireless transceiver from said base station in the calculation of the position of said wireless transceiver.
Claim 5
Dependent Claim
18 words
The invention of claim 1 including means disposed at the base station for identifying two optimal positioning satellites.
Claim 6
Dependent Claim
30 words
The invention of claim 1 including means for switching said mobile wireless transceiver from a first mode for effecting voice/data communication to a second mode for locating the position thereof.
Claim 7
Dependent Claim
104 words
The invention of claim 1 wherein said means disposed at the base station for calculating the position of said wireless transceiver includes: means for utilizing said second set of pseudo ranges to calculate a third set of pseudo ranges between said first and second satellites and said base station, respectively and means for utilizing known positions of the two satellites at time T, the position of the base station, the third set of pseudo ranges and a delay in the time of arrival of a signal transmitted from the mobile wireless transceiver to the base station to ascertain the position of said wireless transceiver.
Claim 8
Dependent Claim
60 words
The invention of claim 6 wherein said means for calculating the position of the wireless transceiver includes means for finding an intersection of a first sphere of first radii around a first of the two satellites, a second sphere of second radii around a second of the two satellites, and a third sphere of third radii around said base station.
Claim 9
Dependent Claim
60 words
The invention of claim 1 wherein said means for calculating the position of the wireless transceiver includes means for finding an intersection of a first sphere of first radii around a first of the two satellites, a second sphere of second radii around a second of the two satellites, and a third sphere of third radii around said base station.
Claim 10
Independent Claim
266 words
A system for determining a position of a mobile wireless transceiver comprising: a base station; means disposed at the base station for identifying first and second Global Positioning System satellites; means for calculating a Doppler shift of signals transmitted from said first and second satellites, respectively, relative to the base station; means for calculating a first set of pseudo ranges of the first and second satellites, respectively, relative to said base station; means for sending satellite identification information, Doppler shift information, and said pseudo-range information from said base station to said wireless transceiver; means disposed at said wireless transceiver for receiving said satellite identification information, Doppler shift information, and said pseudo range information from said base station; means disposed at said mobile wireless transceiver for utilizing said information received from said base station to identify a second set of pseudo ranges between said transceiver and said first and second satellites, respectively, at a time T; means disposed at said mobile wireless transceiver for sending to said base station said second set of pseudo ranges between said transceiver and said first and second satellites, respectively, along with time information for the time T and means disposed at the base station for calculating the position of said wireless transceiver in response to said second set of pseudo ranges and said time information for the time T said means for calculating including: means for determining the distance of said wireless transceiver from said base station and means for utilizing the distance of said wireless transceiver from said base station in the calculation of the position of said wireless transceiver.
Claim 11
Independent Claim
266 words
A system for determining a position of a mobile wireless transceiver comprising: a base station; means disposed at the base station for identifying first and second Global Positioning System satellites; means for calculating a Doppler shift of signals transmitted from said first and second satellites, respectively, relative to the base station; means for calculating a first set of pseudo ranges of the first and second satellites, respectively, relative to said base station; means for sending satellite identification information, Doppler shift information, and said pseudo-range information from said base station to said wireless transceiver; means disposed at said wireless transceiver for receiving said satellite identification information, Doppler shift information, and said pseudo range information from said base station; means disposed at said mobile wireless transceiver for utilizing said information received from said base station to identify a second set of pseudo ranges between said transceiver and said first and second satellites, respectively, at a time T; means disposed at said mobile wireless transceiver for sending to said base station said second set of pseudo ranges between said transceiver and said first and second satellites, respectively, along with time information for the time T and means disposed at the base station for calculating the position of said wireless transceiver in response to said second set of pseudo ranges and said time information for the time T said means for calculating including: means for determining the distance of said wireless transceiver from said base station and means for utilizing the distance of said wireless transceiver from said base station in the calculation of the position of said wireless transceiver.
Claim 12
Dependent Claim
30 words
The invention of claim 9 including means for switching said mobile wireless transceiver from a first mode for effecting voice/data communication to a second mode for locating the position thereof.
Claim 13
Dependent Claim
106 words
The invention of claim 9 wherein said means disposed at the base station for calculating the position of said wireless transceiver includes: means for utilizing said second set of pseudo ranges to calculate a third set of pseudo ranges between said first and second satellites and said base station, respectively and means for utilizing known positions of the first and second satellites at time T the position of the base station, the third set of pseudo ranges and a delay in the time of arrival of a signal transmitted from the mobile wireless transceiver to the base station to ascertain the position of said wireless transceiver.
Claim 14
Dependent Claim
59 words
The invention of claim 11 wherein said means for calculating the position of the wireless transceiver includes means for finding an intersection of a first sphere of radii around a first of the two satellites, a second sphere of second radii around a second of the two satellites, and a third sphere of third radii around said base station.
Claim 15
Dependent Claim
60 words
The invention of claim 9 wherein said means for calculating the position of the wireless transceiver includes means for finding an intersection of a first sphere of first radii around a first of the two satellites, a second sphere of second radii around a second of the two satellites, and a third sphere of third radii around said base station.
Claim 16
Independent Claim
176 words
A method for determining a position of a mobile wireless transceiver including the steps of: calculating Doppler shift of signals transmitted from first and second satellites, respectively, relative to a base station; calculating a first set of pseudo ranges of the first and second satellites, respectively, relative to said base station; sending satellite identification information, Doppler shift information, and said pseudo-range information from said base station to said wireless transceiver; receiving, at said transceiver, said satellite identification information, Doppler shift information, and said pseudo range information from said base station; utilizing said information received from said base station to identify a second set of pseudo ranges between said transceiver and said first and second satellites, respectively, at a time T; sending to said base station said second set of pseudo ranges between said transceiver and said first and second satellites, respectively, along with time information for the time T; and calculating the position of said wireless transceiver in response to said second set of pseudo ranges 4 , 5 and said time information t x .
Claim 17
Independent Claim
176 words
A method for determining a position of a mobile wireless transceiver including the steps of: calculating Doppler shift of signals transmitted from first and second satellites, respectively, relative to a base station; calculating a first set of pseudo ranges of the first and second satellites, respectively, relative to said base station; sending satellite identification information, Doppler shift information, and said pseudo-range information from said base station to said wireless transceiver; receiving, at said transceiver, said satellite identification information, Doppler shift information, and said pseudo range information from said base station; utilizing said information received from said base station to identify a second set of pseudo ranges between said transceiver and said first and second satellites, respectively, at a time T; sending to said base station said second set of pseudo ranges between said transceiver and said first and second satellites, respectively, along with time information for the time T; and calculating the position of said wireless transceiver in response to said second set of pseudo ranges 4 , 5 and said time information t x .
Claim 18
Dependent Claim
48 words
The invention of claim 14 wherein said step of calculating the position of said wireless transceiver in response to said second set of pseudo ranges and said time information for the time T includes the step of determining the distance of said wireless transceiver from said base station.
Claim 19
Dependent Claim
41 words
The invention of claim 15 wherein said step of calculating the position of said wireless transceiver includes the step of utilizing the distance between said wireless transceiver and said base station in the calculation of the position of said wireless transceiver.
Claim 20
Dependent Claim
14 words
The invention of claim 14 including the step of identifying two optimal positioning satellites.
Claim 21
Dependent Claim
31 words
The invention of claim 14 including the step of switching said mobile wireless transceiver from a first mode for effecting voice/data communication to a second mode for locating the position thereof.
Claim 22
Dependent Claim
98 words
The invention of claim 14 wherein said step of calculating the position of said wireless transceiver includes the steps of: utilizing said second set of pseudo ranges to calculate a third set of pseudo ranges between said first and second satellites and said base station, respectively and utilizing known positions of the two satellites at time T the position of the base station, the third set of pseudo ranges and a delay in the time of arrival of a signal transmitted from the mobile wireless transceiver to the base station to ascertain the position of said wireless transceiver.
Claim 23
Dependent Claim
61 words
The invention of claim 19 wherein said step of calculating the position of the wireless transceiver includes the step of finding an intersection of a first sphere of first radii around a first of the two satellites, a second sphere of second radii around a second of the two satellites, and a third sphere of third radii around said base station.
Claim 24
Dependent Claim
61 words
The invention of claim 14 wherein said step of calculating the position of the wireless transceiver includes the step of finding an intersection of a first sphere of first radii around a first of the two satellites, a second sphere of second radii around a second of the two satellites, and a third sphere of third radii around said base station.
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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) | 2003-06-27 | 2003-12-27 | 2004-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-06-27 | 2007-12-27 | 2008-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-06-27 | 2011-12-27 | 2012-06-27 | $7700.00 | Window Closed / Lapsed |