Method of Updating the Clock Bias Between a Gsm Network Bts and Gps Satellites
First Claim
1. A method of updating the clock bias between the common clock of the satellites of a radio navigation satellite system and the clock of a radio station of an asynchronous cellular radiotelephone system including a mobile device including a radio navigation satellite system receiver for receiving satellite data supplied by at least four satellites and an assistance server for improving the acquisition of satellite data by said mobile device,said method including the following steps:
- said mobile device receiving said satellite data,said mobile device calculating pseudodistances between itself and said satellites,encapsulating said pseudodistances with the time at which said pseudodistances are calculated,transmitting said pseudodistances and said time at which said pseudodistances are calculated in the form of a radio signal from said mobile device to said assistance server via said radio station, andsaid assistance server determining the position of said mobile device and estimating the clock bias between the common clock of said satellites and the clock of said radio station using said pseudodistances and said time at which said pseudodistances are calculated.
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Accused Products
Abstract
The present invention relates to a method of updating the clock bias between the common clock of the satellites of a radio navigation satellite system and the clock of a radio station of an asynchronous cellular radiotelephone system including a mobile device including a radio navigation satellite system receiver for receiving satellite data supplied by at least four satellites and an assistance server for improving the acquisition of satellite data by the mobile device. The method includes the steps of the mobile device receiving the satellite data, the mobile device calculating pseudodistances between itself and the satellites, encapsulating the pseudodistances with the time at which the pseudodistances are calculated, transmitting the pseudodistances and the time at which the pseudodistances are calculated in the form of a radio signal from the mobile device to the assistance server via the radio station, and the assistance server determining the position of the mobile device and estimating the clock bias between the common clock of the satellites and the clock of the radio station using the pseudodistances and the time at which the pseudodistances are calculated.
12 Citations
13 Claims
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1. A method of updating the clock bias between the common clock of the satellites of a radio navigation satellite system and the clock of a radio station of an asynchronous cellular radiotelephone system including a mobile device including a radio navigation satellite system receiver for receiving satellite data supplied by at least four satellites and an assistance server for improving the acquisition of satellite data by said mobile device,
said method including the following steps: -
said mobile device receiving said satellite data, said mobile device calculating pseudodistances between itself and said satellites, encapsulating said pseudodistances with the time at which said pseudodistances are calculated, transmitting said pseudodistances and said time at which said pseudodistances are calculated in the form of a radio signal from said mobile device to said assistance server via said radio station, and said assistance server determining the position of said mobile device and estimating the clock bias between the common clock of said satellites and the clock of said radio station using said pseudodistances and said time at which said pseudodistances are calculated. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11, 12)
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5. An assistance server for improving the acquisition of satellite data by a mobile device, said server including a database for the clock bias between the clock of the radio stations of an asynchronous cellular radiotelephone system and the common clock of the satellites of a radio navigation satellite system.
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13. A method of updating the clock bias between the common clock of the satellites of a radio navigation satellite system and the clock of a radio station of an asynchronous cellular radiotelephone system including a mobile device including a radio navigation satellite system receiver for receiving satellite data supplied by at least four satellites and exchanging a radio signal with said radio station and an assistance server for improving the acquisition of satellite data by said mobile device, said method including the following steps:
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said mobile device receiving said satellite data, said mobile device calculating pseudodistances between itself and said satellites, and said mobile device determining its position and estimating the clock bias between the common clock of said satellites and the clock of said radio station using said pseudodistances and said time at which said pseudodistances are calculated, said time at which said pseudodistances are calculated corresponding to time information supplied by said radio station.
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Specification