Method and apparatus for geolocation determination
First Claim
1. A method for detecting an erroneous satellite measurement from a signal sent by a satellite and received by a receiver, comprising the steps of:
- (a) determining an approximate location of the receiver;
(b) determining an elevation for each of a plurality of satellites from which the receiver receives a signal; and
(c) for each one of the plurality of satellites;
(i) determining an uncertainty value as a function of the satellite elevation;
(ii) determining an expected range between the receiver and the satellite;
(iii) measuring a range between the receiver and the satellite;
(iv) determining a range difference between the expected range and the measured range;
(v) determining a median value of the range differences;
(vi) determining an offset value between the range difference and the median value; and
(vii) comparing the offset value with a value that is the sum of the uncertainty value and a predetermined threshold to thereby detect an erroneous satellite measurement.
12 Assignments
0 Petitions
Accused Products
Abstract
The disclosure relates to method and apparatus for geolocation determination. In one embodiment, the disclosure relates to a method for detecting an erroneous satellite measurement by a receiver, including the steps of (a) determining an approximate location of the receiver; (b) for each of a plurality of satellites from which the receiver receives a signal: (i) determining a range difference between an expected range between the receiver and the satellite and a measured range between the receiver and the satellite; (ii) determining a median value of the range differences; (iii) determining an offset value between the range difference and the median value; (iv) comparing the offset value with a predetermined threshold to thereby detect an erroneous satellite measurement.
10 Citations
41 Claims
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1. A method for detecting an erroneous satellite measurement from a signal sent by a satellite and received by a receiver, comprising the steps of:
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(a) determining an approximate location of the receiver; (b) determining an elevation for each of a plurality of satellites from which the receiver receives a signal; and (c) for each one of the plurality of satellites; (i) determining an uncertainty value as a function of the satellite elevation; (ii) determining an expected range between the receiver and the satellite; (iii) measuring a range between the receiver and the satellite; (iv) determining a range difference between the expected range and the measured range; (v) determining a median value of the range differences; (vi) determining an offset value between the range difference and the median value; and (vii) comparing the offset value with a value that is the sum of the uncertainty value and a predetermined threshold to thereby detect an erroneous satellite measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for detecting an erroneous satellite measurement from a signal sent by a Global Navigation Satellite System (“
- GNSS”
) satellite and received by a receiver, where the receiver is receiving signals from a cellular communication network, comprising the steps of;(a) determining an approximate location of the receiver as a function of an area of a cell in the cellular communication network; (b) determining an elevation for each of a plurality of satellites from which the receiver receives a signal as a function of ephemeris information received from at least one of the plurality of satellites; (c) for each one of the plurality of satellites; (i) determining an uncertainty value as a function of the satellite elevation and the approximate location of the receiver; (ii) determining an expected range between the receiver and the satellite as a function of the ephemeris information and the approximate location of the receiver; (iii) measuring a range between the receiver and the satellite from a signal transmitted by the satellite and received by the receiver (iv) determining a range difference between the expected range and the measured range; (v) determining a median value of the range differences; (vi) determining an offset value between the range difference and the median value; and (vii) comparing the offset value with a value that is the sum of the uncertainty value and a predetermined threshold to thereby detect an erroneous satellite measurement. - View Dependent Claims (18, 19, 20, 21)
- GNSS”
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22. An apparatus for detecting an erroneous satellite measurement from a signal sent by a satellite and received by a receiver, comprising:
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means for determining an approximate location of said receiver; circuitry for determining an elevation for each of a plurality of satellites from which said receiver receives a signal; circuitry for determining an uncertainty value as a function of the satellite elevation for each respective one of said plural satellites; circuitry for determining an expected range between said receiver and each respective one of said plural satellites; circuitry for measuring a range between said receiver and each respective one of said plural satellites; circuitry for determining a range difference between the expected range and the measured range for each respective one of said plural satellites; circuitry for determining a median value of the range differences; circuitry for determining an offset value between the median value and the range difference for each respective one of said plural satellites; and circuitry for comparing the offset value with a value that is the sum of the uncertainty value and a predetermined threshold to thereby detect an erroneous satellite measurement. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. An apparatus for detecting an erroneous satellite measurement from a signal sent by a Global Navigation Satellite System (“
- GNSS”
) satellite and received by a receiver, where the receiver is receiving signals from a cellular communication network, comprising;circuitry for determining an approximate location of said receiver as an area of a cell in the cellular communication network; circuitry for determining an elevation for each of a plurality of satellites from which said receiver receives a signal as a function of ephemeris information received from at least one of said plural satellites; circuitry for determining an uncertainty value as a function of the satellite elevation for each respective one of said plural satellites and the approximate location of said receiver; circuitry for determining an expected range between said receiver and each respective one of said plural satellites as a function of the ephemeris information and the approximate location of said receiver; circuitry for measuring a range between said receiver and each respective one of said plural satellites from a signal transmitted by a respective one of said plural satellites and received by said receiver; circuitry for determining a range difference between the expected range and the measured range; circuitry for determining a median value of the range differences; circuitry for determining an offset value between the median value and the range difference for each respective one of said plural satellites; and circuitry for comparing the offset value with a value that is the sum of the uncertainty value and a predetermined threshold to thereby detect an erroneous satellite measurement. - View Dependent Claims (38, 39, 40, 41)
- GNSS”
Specification