System and method for determining the location of a mobile device
A system and method for determining the location of a mobile device. A first set of signals from a plurality of radio frequency (“RF”) sources may be received at a mobile device and then downconverted into a second set of signals. The mobile device may then time stamp the second set of signals and transmit the time stamped signals to a location determining system. The location of the mobile device may be determined at the location determining system as a function of the time stamped signals.
1. A method for determining the location of a mobile device comprising the steps of:
(a) receiving at a mobile device a first set of signals from a plurality of radio frequency (“RF”) sources;
(b) downconverting at the mobile device the first set of signals into a second set of signals;
(c) time stamping at the mobile device the second set of signals;
(d) transmitting the time stamped signals from the mobile device to a location determining system; and
(e) determining the location of the mobile device at the location determining system as a function of the time stamped signals and as a function of information from a wide area reference network (“WARN”),
wherein the location determining system is a mobile location center (“MLC”) or a location information server (“LIS”), and
wherein the information is at least one of ephemeris information, ionosphere model information, UTC model information, and combinations thereof.
2. The method of claim 1 further comprising the step of transmitting from the location determining system to the mobile device at least one of a location request, a predetermined frequency range, a predetermined sampling duration, a predetermined sampling rate and a predetermined sampling resolution to receive the first set of signals, a time synchronization, a sampling interval, a sampling duration, a sampling rate, a sampling resolution, and combinations thereof.
3. The method of claim 1 wherein the second set of signals is in an intermediate frequency range.
4. The method of claim 1 wherein the RF source is selected from the group consisting of: a cellular network, a Global Navigation Satellite System (“GNSS”), a Global Positioning System (“GPS”), Galileo system, GLONASS system, Quasi-Zenith Satellite System (“QZSS”), Compass system, Bediou system, Satellite Based Augmentation Systems (“SBAS”), Wide Area Augmentation System (“WAAS”), European Geostationary Navigation Overlay Service (“EGNOS”), digital television network, and combinations thereof.
5. The method of claim 1 wherein the mobile device is selected from the group consisting of: cellular device, text messaging device, computer, portable computer, vehicle locating device, vehicle security device, communication device, and wireless transceiver.
6. A method for determining the location of a mobile device comprising the steps of:
(a) transmitting at least one of a location request, a first frequency range, a first sampling duration, a first sampling rate, a first sampling resolution, and a time synchronization from a location determining system to a mobile device;
(b) receiving at the mobile device a plurality of signals from a plurality of radio frequency (“RF”) sources;
(c) downconverting at the mobile device the received plural signals into a plurality of intermediate frequency signals;
(d) time stamping the plural intermediate frequency signals at the mobile device;
(e) transmitting the time stamped signals from the mobile device to the location determining system; and
(f) determining the location of the mobile device at the location determining system as a function of the time stamped signals.
7. The method of claim 6 wherein the location determining system is a mobile location center (“MLC”) or a location information server (“LIS”).
8. The method of claim 6 further comprising the step of transmitting at least one of a second frequency range, second sampling duration, second sampling rate, and second sampling resolution from the location determining system to the mobile device if the first sampling duration provided an insufficient number of plural signals or if plural signals from another RF source is required.
9. The method of claim 6 further comprising iteratively repeating steps (a)-(e).
10. The method of claim 6 wherein the location of the device is determined also as a function of information from a wide area reference network (“WARN”).
11. The method of claim 10 wherein the information is at least one of ephemeris information, ionosphere model information, UTC model information, and combinations thereof.
12. The method of claim 6 wherein the RF source is selected from the group consisting of: a cellular network, a Global Navigation Satellite System (“GNSS”), a Global Positioning System (“GPS”), Galileo system, GLONASS system, Quasi-Zenith Satellite System (“QZSS”), Compass system, Bediou system, Satellite Based Augmentation Systems (“SBAS”), Wide Area Augmentation System (“WAAS”), European Geostationary Navigation Overlay Service (“EGNOS”), digital television network, and combinations thereof.
13. The method of claim 6 wherein the mobile device is selected from the group consisting of: cellular device, text messaging device, computer, portable computer, vehicle locating device, vehicle security device, communication device, and wireless transceiver.
14. A method for determining the location of a mobile device comprising the steps of:
(a) transmitting a location request from a mobile device to a location determining system;
(b) transmitting at least one of a first frequency range, a first sampling duration, a first sampling rate, a first sampling resolution, and a time synchronization from the location determining system to the mobile device in response to the location request;
(c) receiving at a mobile device a plurality of signals from a plurality of radio frequency (“RF”) sources;
(d) downconverting at the mobile device the received plural signals into a plurality of intermediate frequency signals;
(e) time stamping at the mobile device the intermediate frequency signals;
(f) transmitting the time stamped signals from the mobile device to the location determining system; and
(g) determining the location of the mobile device at the location determining system as a function of the time stamped signals.
15. The method of claim 14 wherein the location determining system is a mobile location center (“MLC”) or a location information server (“LIS”).
16. The method of claim 14 further comprising the step of transmitting at least one of a second frequency range, second sampling duration, second sampling rate, and second sampling resolution from the location determining system to the mobile device if the first sampling duration provided an insufficient number of plural signals or if plural signals from another RF source is required.
17. The method of claim 14 wherein the location of the device is determined also as a function of information from a wide area reference network (“WARN”).
18. The method of claim 17 wherein the information is at least one of ephemeris information, ionosphere model information, UTC model information, and combinations thereof.
19. The method of claim 14 wherein the RF source is selected from the group consisting of: a cellular network, a Global Navigation Satellite System (“GNSS”), a Global Positioning System (“GPS”), Galileo system, GLONASS system, Quasi-Zenith Satellite System (“QZSS”), Compass system, Bediou system, Satellite Based Augmentation Systems (“SBAS”), Wide Area Augmentation System (“WAAS”), European Geostationary Navigation Overlay Service (“EGNOS”), digital television network, and combinations thereof.
20. The method of claim 14 wherein the mobile device is selected from the group consisting of: cellular device, text messaging device, computer, portable computer, vehicle locating device, vehicle security device, communication device, and wireless transceiver.
21. A system for determining the location of a mobile device from signals received from a plurality of radio frequency (“RF”) sources comprising:
(a) a mobile device having:
(i) a receiver for receiving signals from the plural RF sources,
(ii) circuitry for downconverting the received signals,
(iii) circuitry for time stamping the downconverted signals, and
(iv) a transmitter for transmitting the time stamped signals; and
(b) a location determining system having:
(i) a receiver for receiving signals transmitted from the mobile device, and
(ii) circuitry for determining the location of the mobile device as a function of the received signals from the device; and
(c) a database having information from a wide area reference network (“WARN”),
wherein the location determining system is a mobile location center (“MLC”) or a location information server (“LIS”), and
wherein the information is at least one of ephemeris information, ionosphere model information, UTC model information, and combinations thereof.
22. The system of claim 21 wherein the RF source is selected from the group consisting of: a cellular network, a Global Navigation Satellite System (“GNSS”), a Global Positioning System (“GPS”), Galileo system, GLONASS system, Quasi-Zenith Satellite System (“QZSS”), Compass system, Bediou system, Satellite Based Augmentation Systems (“SBAS”), Wide Area Augmentation System (“WAAS”), European Geostationary Navigation Overlay Service (“EGNOS”), digital television network, and combinations thereof.
23. The system of claim 21 wherein the mobile device is selected from the group consisting of: cellular device, text messaging device, computer, portable computer, vehicle locating device, vehicle security device, communication device, and wireless transceiver.
24. The system of claim 21 wherein the location determining system further includes a transmitter for transmitting to the mobile device at least one of a location request, a predetermined frequency range, a predetermined sampling period, a predetermined sampling rate, a predetermined sampling resolution to receive signals from the plural RF sources, and a time synchronization.