Method and apparatus for geolocation determination
First Claim
1. A method for determining the location of a receiver receiving signals from a plurality of Global Navigation Satellite System (“
- GNSS”
) satellites in which one of the received signals is erroneous, comprising the steps of;
(a) determining an approximate location of the receiver;
(b) for each one of the plurality of satellites;
(i) determining an expected range between the receiver and the satellite;
(ii) measuring a range between the receiver and the satellite;
(iii) determining a range difference between the expected range and the measured range;
(iv) determining a median value of the range differences;
(v) determining an offset value between the range difference and the median value;
(vi) comparing the offset value with a predetermined threshold to thereby detect an erroneous satellite measurement;
(c) determining if there are at least four offset values less than the predetermined threshold; and
(d) determining the location of the receiver using the range measurements from the satellites for which the offset values are less than the predetermined threshold.
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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.
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Citations
36 Claims
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1. A method for determining the location of a receiver receiving signals from a plurality of Global Navigation Satellite System (“
- GNSS”
) satellites in which one of the received signals is erroneous, comprising the steps of;(a) determining an approximate location of the receiver; (b) for each one of the plurality of satellites; (i) determining an expected range between the receiver and the satellite; (ii) measuring a range between the receiver and the satellite; (iii) determining a range difference between the expected range and the measured range; (iv) determining a median value of the range differences; (v) determining an offset value between the range difference and the median value; (vi) comparing the offset value with a predetermined threshold to thereby detect an erroneous satellite measurement; (c) determining if there are at least four offset values less than the predetermined threshold; and (d) determining the location of the receiver using the range measurements from the satellites for which the offset values are less than the predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- GNSS”
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19. An apparatus for determining location from signals received from a plurality of Global Navigation Satellite System (“
- GNSS”
) satellites in which one of the received signals is erroneous, comprising;a receiver for receiving said satellite signals; means for determining an approximate location of the receiver; circuitry for determining an expected range between the apparatus and the satellite; circuitry for measuring a range between the apparatus and the satellite; 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 range difference and the median value; circuitry for comparing the offset value with a predetermined threshold to thereby detect an erroneous satellite measurement; circuitry for determining if there are at least four offset values less than the predetermined threshold; and circuitry for determining the location of the apparatus using the range measurements from the satellites for which the offset values are less than the predetermined threshold. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
- GNSS”
Specification