Radio positioning systems

• US 7,359,719 B1
• Filed: 06/01/2000
• Issued: 04/15/2008
• Est. Priority Date: 06/01/1999
• Status: Expired due to Fees

• Current Assignee: Cambridge Positioning Systems Limited (Qualcomm, Inc.)
• Original Assignee: Cambridge Positioning Systems Limited (Qualcomm, Inc.)
• Inventors: Duffett-Smith, Peter James, Brice, James Paul, Hansen, Paul
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US09/830,447
• Time in Patent Office: 2,875 Days
• Field of Search: 4554561-4563, 455524-526, 455/67.1, 455/423, 455/67.11, 342463-465, 342/387
• US Class Current: 455/456.6
• CPC Class Codes: G01S 1/024 of beacon transmitters
• CPC Class Codes: G01S 2205/008 using a mobile telephone network
• CPC Class Codes: G01S 5/0036 of measured values, i.e. measurement on mobile and position calculation on base station
• CPC Class Codes: G01S 5/10 Position of receiver fixed by co-ordinating a plurality of position lines defined by path-difference measurements , e.g. omega or decca systemsG01S5/12 takes precedence ; beacons and receivers cooperating therewith G01S1/306, G01S1/308
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Abstract

The invention described relates to a radio positioning system primarily for a mobile telephone network, in which a list of offsets in time, phase, frequency, or derivatives thereof, or their equivalents expressed as offsets in distance or derivatives thereof, of a plurality of transmission source signals, received at a given location, relative to a common reference are generated. Data is acquired from one or more receivers, the positions of which may be known or determined. Such data are offsets in time, phase, frequency, or derivatives thereof, respectively of signals received from the transmission sources relative to a reference source in each receiver or to each other. The acquired data is combined for calculating the list of offsets relative to the common reference.

Claims

1. A method of generating in a virtual location measurement unit a list of offsets relative to a common reference, said list of offsets being in time, phase, frequency, or derivatives thereof, or their equivalents expressed as offsets in distance or derivatives thereof, of a plurality of transmission source signals, which would be received at a given location, the method comprising;

(a) acquiring, in the virtual location measurement unit, data from plural receivers, the plural receivers not necessarily fixed or at known positions the data from each of the plural receivers comprising offsets in time, phase, frequency, or derivatives thereof, respectively of signals received from the transmission sources relative to a reference source in each receiver or to each other; and

(b) combining the acquired data and calculating the list of offsets relative to the common reference in the virtual location measurement unit.

3. A radio positioning method for determining a position of one receiver or positions of more receivers, which the position of one receiver or the positions of more receivers are unknown, which method comprises generating the list of offsets according to claim 1 or claim 2.

4. A radio positioning method according to claim 3, wherein the common reference comprises an external reference.

5. A radio positioning method according to claim 4, wherein the common reference comprises a GPS signal.

6. A radio positioning method according to claim 3, wherein the step of acquiring data from said plural receivers includes instigating acquisition of said data from a common location.

7. A radio positioning method according to claim 3, wherein the step of acquiring data from said plural receivers includes instigating acquisition of said data from each said receiver at times determined by each said receiver.

2. A method of generating in a virtual location measurement unit a list of offsets relative to a common reference, said list of offsets being in time, phase, frequency, or derivatives thereof, or their equivalents expressed as offsets in distance or derivatives thereof, of a plurality of transmission source signals, which would be received at a given location, the method comprising;

(a) acquiring, in the virtual location measurement unit, data from plural receivers, the plural receivers not necessarily fixed or at known positions, the data from each of the plural receivers being representative of the received signals;

(b) determining from the acquired data, in the virtual location measurement unit, the offsets in time, phase, frequency, or derivatives thereof, respectively of signals received from the transmission sources relative to a reference source in each receiver or to each other; and

(c) combining the determined offsets and calculating the list of offsets relative to the common reference in the virtual location measurement unit.

8. Apparatus for generating, in a virtual location measurement unit, a list of offsets relative to a common reference, said list of offsets being in time, phase, frequency, or derivatives thereof, or their equivalents expressed as offsets in distance or derivatives thereof, of a plurality of transmission source signals, which would be received at a given location, the method comprising;

(a) means for acquiring, in the virtual location measurement unit, data from plural receivers, the plural receivers not necessarily fixed or at known positions, the data from each of the plural receivers comprising offsets in time, phase, frequency, or derivatives thereof, respectively of signals received from the transmission sources relative to a reference source in each receiver or to each other; and

(b) means for combining the acquired data and calculating the list of offsets relative to the common reference in the virtual location measurement unit.

10. A radio positioning system including apparatus according to claim 8 or to claim 9.

11. A radio positioning system according to claim 10, wherein the common reference comprises a reference external to said receivers.

12. A radio positioning system according to claim 11, wherein the common reference comprises a GPS signal.

13. A radio positioning system according to claim 10, wherein the means for acquiring data from said plural receivers includes a computer system arranged to instigate the transfer of said data from said plural receivers to said computer system at times determined by said computer system.

14. A radio positioning system according to claim 10, wherein the means for acquiring data from said plural receivers includes a computer system, and including means for instigating said acquisition of data from each said receiver at times determined by each said receiver.

15. A digital telephone network, including a radio positioning system according to claim 10.

9. Apparatus for generating, in a virtual location measurement unit, a list of offsets relative to a common reference, said list of offsets being in time, phase, frequency, or derivatives thereof, or their equivalents expressed as offsets in distance or derivatives thereof, of a plurality of transmission source signals, which would be received at a given location, the method comprising;

(a) means for acquiring, in the virtual location measurement unit, data from plural receivers, the plural receivers not necessarily fixed or at known positions, the data from each of the plural receiver being representative of the received signals;

(b) means for determining from the acquired data, in the virtual location measurement unit, the offsets in time, phase, frequency, or derivatives thereof, respectively of signals received from the transmission sources relative to a reference source in each receiver or to each other; and

(c) means for combining the determined offsets and calculating the list of offsets relative to the common reference in the virtual location measurement unit.