Method and apparatus for estimating GPS time
First Claim
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1. A method of providing an estimate of GPS time from non-GPS timing information present in communications signals transmitted from a base station to a first mobile communications device, the method comprising the steps of:
- (i) in a second mobile communications device, receiving corresponding non-GPS timing signals present in communications signals transmitted by the base station (ii) in a GPS receiver of the second mobile communications device, obtaining at least one pseudorange to a GPS satellite and obtaining an first estimate of GPS time;
(iii) deriving a relationship between the receipt of timing signals received in step (i) and the estimate of GPS time obtained in step (ii); and
(iv) from the non-GPS timing information received by the first mobile communications device and the relationship derived in step (iii), calculating a second estimate of GPS time.
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Abstract
A method of providing an estimate of GPS time from non-GPS timing information present in communications signals transmitted from a base station (BS1) to a first mobile communications device (MS1) is provided comprising the steps of (i) in a second mobile communications device (MS2), receiving corresponding non-GPS timing signals present in communications signals transmitted by the base station; (ii) in a GPS receiver (23, 24) of the second mobile communications device (MS2), obtaining at least one pseudorange to a GPS satellite (GPS SV) and obtaining an first estimate of GPS time; (iii) deriving a relationship between the receipt of timing signals received in step (i) and the estimate of GPS time obtained in step (ii); and (iv) from the non-GPS timing information received by the first mobile communications device (MS1) and the relationship derived in step (iii), calculating a second estimate of GPS time.
29 Citations
29 Claims
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1. A method of providing an estimate of GPS time from non-GPS timing information present in communications signals transmitted from a base station to a first mobile communications device, the method comprising the steps of:
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(i) in a second mobile communications device, receiving corresponding non-GPS timing signals present in communications signals transmitted by the base station (ii) in a GPS receiver of the second mobile communications device, obtaining at least one pseudorange to a GPS satellite and obtaining an first estimate of GPS time;
(iii) deriving a relationship between the receipt of timing signals received in step (i) and the estimate of GPS time obtained in step (ii); and
(iv) from the non-GPS timing information received by the first mobile communications device and the relationship derived in step (iii), calculating a second estimate of GPS time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
and wherein the database contains relationships of the type derived in step (iii) far at least two such basestations.
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12. A method according to claim 9 wherein the server is web based and capable of being accessed over the internet.
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13. A method according to claim 9 wherein the database is connected to a network system controller.
- 14. A system comprising a base station and first and second mobile communications devices wherein the system is configured to derive a relationship between non-GPS timing signals present in communications signals transmitted by the base station to the second mobile communications device and a first estimate of GPS time obtained from a GPS receiver of the second mobile communications device, and using said relationship and non-GPS timing information received by the first mobile communications device, to obtain a second estimate of GPS time.
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26. A mobile communications device comprising a GPS receiver and adapted to transmit to a corresponding communications base station information describing the relationship between the receipt of non-GPS timing signals present in communications signals transmitted by the base station and received by the device and an estimate of GPS time obtained using the GPS receiver.
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27. A mobile communications device comprising a communications receiver adapted to receive from a corresponding communications base station information describing the relationship between the GPS timing signals present in communications signals transmitted by the base station and GPS time, and a processor for using the relationship to obtain an estimate of GPS time at the mobile communications device;
- wherein the mobile communications device is able to communicate the base station being one of several such basestations of a cellular telephone network where are not synchronized using GPS receivers.
- View Dependent Claims (28)
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29. A mobile communications device comprising a communications receiver adapted to receive from a corresponding communications base station information describing the relationship between non-GPS timing signals present in communications signals transmitted by the base station and GPS time, and a processor for using the relationship to obtain an estimate of GPS time at the mobile communications device;
- wherein the mobile communications device does not comprise a GPS receiver.
Specification
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Current AssigneeBreakwaters Innovations LLC
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Original AssigneeKoninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
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InventorsYule, Andrew T., Dooley, Saul R.
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Primary Examiner(s)Blum, Theodore M.
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Application NumberUS10/197,341Publication NumberTime in Patent Office762 DaysField of Search342/357.1, 342/357.06, 701/213, 455/456.1US Class Current342/357.62CPC Class CodesG01S 19/14 specially adapted for speci...G01S 19/39 the satellite radio beacon ...
