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Stand alone global positioning system (GPS) and method with high sensitivity
| Details |
Inventors: Camp, Jr., Thomas O.; Makovicka, Thomas J.;
Assignee: Ericsson Inc. (Research Triangle Park, NC)
Primary Examiner: Eisenzopf; Reinhard
Assistant Examiner: Mehrpour; N.
Attorney, Agent or Firm: Wood, Phillips, VanSanten, Clark & Mortimer
A method is provided for determining the position of a user terminal utilizing global positioning system (GPS) satellites, each of the GPS satellites transmitting a signal containing information indicative of the orbital parameters of the respective GPS satellite, timing and synchronization data and clock correction parameters. The method includes the steps of approximating an expected range of Doppler frequencies within which at least one GPS satellite should be located, within this range, searching for and acquiring a first GPS signal from a first GPS satellite at the user terminal strong enough to demodulate, the first GPS signal containing information indicative of the orbital parameters of the first GPS satellite, timing and synchronization data and clock correction parameters, demodulating the first GPS signal to obtain time of week information, measuring code phase synchronization for the first GPS signal utilizing the time of week information, searching for and acquiring second, third and fourth GPS signals at the user terminal from second, third and fourth GPS satellites, respectively, measuring code phase synchronizations for the second, third and fourth GPS signals utilizing the time of week information, and calculating the position of the user terminal utilizing the code phase synchronizations of the first through fourth GPS signals. |
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DETAILED DESCRIPTION A method is provided for determining the position of a user terminal utilizing global positioning system (GPS) satellites, each of the GPS satellites transmitting a signal containing information indicative of the orbital parameters of the respective GPS satellite, timing and synchronization data and clock correction parameters.
The information for each satellite in view of the user terminal is sent to the user terminal, via a communications link, from an auxiliary communications system having a central server with a GPS receiver that has demodulated the signal.
Also sent to the user terminal is the approximate location of the user terminal with respect to a location remote from the user terminal.
The (most basic) method includes the steps of searching for and acquiring code phase synchronization of at least four (4) GPS signals, demodulating at least one of the GPS signals that is at a sufficiently high enough signal level to permit demodulation, and obtaining time of week data and timing synchronization from the demodulated GPS signal.
The information (time of week data and timing synchronization) so obtained is then utilized for a final location solution by using the time of week information inserted into the orbital parameters to locate the satellite positions at the time of the code phase measurements.
The code phase measurements, clock correction data, satellite locations and approximate user location are then used to solve for precise user location.
In one aspect, the step of searching for and acquiring code phase synchronization is facilitated by using the satellite locations and approximate user location to calculate an expected range of Doppler frequencies for each satellite to narrow the search space for the GPS signals.
In another aspect, the location remote from the user terminal includes a cellular base station included in the auxiliary communications system, wherein the accuracy of the cellular base station of the auxiliary communications system enables calibration of the GPS receiver frequency to further reduce the Doppler frequency ranges that must be searched in order to acquire code phase synchronization of the GPS satellite signals
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Control Computers 
