Method of determining the position of a mobile unit
First Claim
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1. A method of determining the position of a mobile unit having a GPS receiver comprising the steps of:
- measuring mobile unit pseudoranges at the mobile unit using the GPS receiver;
receiving GPS ephemeris data in the form of Keplerian parameters at a reference location located remote from the mobile unit;
calculating from the GPS ephemeris data satellite vector information in Cartesian form describing one of;
GPS satellite position information and GPS satellite movement information;
providing the GPS satellite vector information to the mobile unit; and
determining the position of the mobile unit as a function of the GPS satellite vector information and the mobile unit pseudoranges.
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Abstract
A method of determining the position of a mobile unit (MS1) having a GPS receiver (24) is disclosed. The method comprising the steps of measuring mobile unit pseudoranges at the mobile unit (MS1) using the GPS receiver (24); providing reference pseudoranges corresponding to a reference location situated remote from the mobile unit (BS1); and determining the position of the mobile unit (MS1) relative to the reference location (BS1) as a function of both the reference pseudoranges and the mobile unit pseudoranges.
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Citations
22 Claims
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1. A method of determining the position of a mobile unit having a GPS receiver comprising the steps of:
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measuring mobile unit pseudoranges at the mobile unit using the GPS receiver;
receiving GPS ephemeris data in the form of Keplerian parameters at a reference location located remote from the mobile unit;
calculating from the GPS ephemeris data satellite vector information in Cartesian form describing one of;
GPS satellite position information and GPS satellite movement information;
providing the GPS satellite vector information to the mobile unit; and
determining the position of the mobile unit as a function of the GPS satellite vector information and the mobile unit pseudoranges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 22)
where cm and cref are the GPS clock errors at the mobile unit and the reference location respectively;
PSRmn and PSRrefn are the mobile unit and reference pseudoranges respectively; and
wherein H−
1 is the inverse of matrix H which includes normalised direction vectors of satellites relative to the reference location in the form;
where Ri-ref is the range between the ith satellite and the reference location.
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7. A method according to claim 1 wherein the GPS satellite position information is obtained from GPS satellite signals received by a GPS receiver located at the reference location.
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8. A method according to claim 1 wherein the GPS satellite position information is provided using a GPS receiver located at the reference location.
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9. A method according to claim 1 wherein the GPS satellite position information is provided by calculation based on the reference location and GPS satellite signal information obtained from GPS satellite signals received by a GPS receiver located remote from the reference location.
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10. A method according to claim 1 wherein the GPS satellite vector information is provided by calculation based on the reference location and GPS satellite signal information obtained from a GPS receiver located remote from the reference location.
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11. A method according to claim 1 wherein the mobile unit pseudoranges are transmitted from the mobile unit to a communications base station, and wherein the position of the mobile unit relative to the reference location is determined remote from the mobile unit.
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12. A method according to claim 1 wherein the GPS satellite vector information is transmitted from a communications base station to the mobile unit, and wherein the position of the mobile unit relative to the reference location is determined at the mobile unit.
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13. A method according to claim 12 further comprising the step of transmitting the position of the mobile unit relative to the reference location from the mobile unit to the communications base station.
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14. A method according to claim 12 further comprising the step of transmitting the reference location from the communications base station to the mobile unit.
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15. A method according to claim 14 further comprising the step of transmitting the absolute position of the mobile unit from the mobile unit to the communications base station.
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16. A method according to claim 12 wherein the reference location geographically coincides with the location of the communications base station.
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20. A method according to claim 12 wherein the reference location geographically coincides with the location of the communications base station.
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22. A mobile unit comprising a GPS receiver and able to determine its position using a method according to claim 1.
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17. A method of determining the position of a mobile unit having a GPS receiver comprising the steps of measuring pseudoranges at the mobile unit;
- providing GPs satellite vector information to the mobile unit;
determining the position of the mobile unit relative to a nearby reference location using the pseudoranges and the GPS satellite vector information; and
determining the absolute position of the mobile unit from both the reference location and the relative location of the mobile unit to the reference location.
- providing GPs satellite vector information to the mobile unit;
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18. A method of determining the position of a mobile unit having a GPS receiver comprising the steps of measuring mobile unit pseudoranges at the mobile unit using the GPS receiver;
- receiving GPS ephemeris data in the form of Keplerian parameters at a reference location located remote from the mobile unit;
calculating from the ephemeris data satellite vector information in Cartesian form describing either or both of the position or movement of GPS satellites;
providing the satellite vector information to the mobile unit; and
determining the position of the mobile unit as a function of the satellite vector information and the mobile unit pseudoranges. - View Dependent Claims (19, 21)
- receiving GPS ephemeris data in the form of Keplerian parameters at a reference location located remote from the mobile unit;
Specification