Method and system for GPS bit-edge synchronization in the presence of burst-mode interference
First Claim
1. A method of performing bit-edge synchronization for a plurality of navigation satellite signals in the presence of periodic interference comprising:
- obtaining predetermined TDOA values for said plurality of navigation satellite signals;
performing bit-edge synchronization on one said satellite signal; and
calculating the bit-edge synchronization for at least one remaining satellite signal based on said predetermined TDOA values.
1 Assignment
0 Petitions
Accused Products
Abstract
In a satellite navigation system receiver co-located with a wireless communication system mobile terminal, periodic interference from the mobile terminal preventing bit-edge synchronization with one or more satellite signals is overcome by using Time Difference Of Arrival (TDOA) values associated with the satellite signals. Either a satellite signal free of periodic interference is chosen by inspection of the TDOA values, or the TDOA values are ranked and synchronization is attempted iteratively. Once a satellite signal is synchronized, the TDOA values are used to calculate synchronization for the remaining signals. The TDOA values may be transmitted to the mobile terminal by a satellite navigation signal information server connected to the wireless communication system, either individually or in broadcast mode to one or more cells. Alternatively, the mobile terminal may acquire the TDOA values from memory or from another data interface.
-
Citations
29 Claims
-
1. A method of performing bit-edge synchronization for a plurality of navigation satellite signals in the presence of periodic interference comprising:
-
obtaining predetermined TDOA values for said plurality of navigation satellite signals;
performing bit-edge synchronization on one said satellite signal; and
calculating the bit-edge synchronization for at least one remaining satellite signal based on said predetermined TDOA values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A method of performing bit-edge synchronization for at least a first and second navigation satellite signal in the presence of periodic interference comprising:
-
receiving said first navigation satellite signal and performing bit-edge synchronization with said first signal;
receiving said second navigation satellite signal; and
calculating the bit-edge synchronization for said second signal based on predetermined TDOA values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A wireless communications system containing a radio access network, comprising:
-
at least one mobile terminal containing a position estimator and periodically transmitting radio frequency signals; and
a satellite navigation signal information server operative to transmit relative timing information between satellite navigation signals to said mobile terminal via said radio access network, wherein said relative timing information may be used by said mobile terminal to overcome interference from said periodic transmission of radio frequency signals in order to perform bit-edge synchronization. - View Dependent Claims (22, 23, 24, 26, 27, 28, 29)
-
-
25. A wireless communications system mobile terminal, comprising:
-
a transceiver for establishing two-way wireless communications, at least partially via periodic radio frequency transmissions;
a position estimator receiving satellite navigation signals, said signals at least partially obscured by said periodic radio frequency transmissions; and
a controller operative to perform bit-edge synchronization on said satellite navigation signals in the presence of said periodic radio frequency transmissions by use of predetermined satellite navigation signal information.
-
Specification