Wide area positioning system

Abstract

Systems and methods are described for determining position of a receiver. The positioning system comprises a transmitter network including transmitters that broadcast positioning signals. The positioning system comprises a remote receiver that acquires and tracks the positioning signals and/or satellite signals. The satellite signals are signals of a satellite-based positioning system. A first mode of the remote receiver uses terminal-based positioning in which the remote receiver computes a position using the positioning signals and/or the satellite signals. The positioning system comprises a server coupled to the remote receiver. A second operating mode of the remote receiver comprises network-based positioning in which the server computes a position of the remote receiver from the positioning signals and/or satellite signals, where the remote receiver receives and transfers to the server the positioning signals and/or satellite signals.

1 . (canceled) 
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . A method for generating and transmitting positioning signals using a network of terrestrial beacons, comprising:
 generating, at a first beacon, a first positioning signal using a first pseudorandom number sequence;   generating, at a second beacon, a second positioning signal using a second pseudorandom number sequence;   broadcasting the first positioning signal during a first time slot of a transmission frame; and   broadcasting the second positioning signal during a second time slot of the transmission frame.   
     
     
         5 . The method of  claim 4 , further comprising:
 optionally generating first assistance data at the first beacon; and   optionally generating second assistance data at the second beacon.   
     
     
         6 . The method of  claim 4 , wherein the transmission frame is 1 second. 
     
     
         7 . The method of  claim 4 , wherein the first time slot and the second time slot are each 100 ms. 
     
     
         8 . The method of  claim 4 , wherein the first time slot and the second time slot are each 100 ms, and wherein the transmission frame is 1 second. 
     
     
         9 . The method of  claim 5 , wherein the transmission frame is 1 second. 
     
     
         10 . The method of  claim 5 , wherein the first time slot and the second time slot are each 100 ms. 
     
     
         11 . The method of  claim 5 , wherein the first time slot and the second time slot are each 100 ms, and wherein the transmission frame is 1 second. 
     
     
         12 . A network of terrestrial beacons for generating and transmitting positioning signals, the network comprising:
 a first beacon, wherein the first beacon generates a first positioning signal using a first pseudorandom number sequence, and wherein the first beacon broadcasts the first positioning signal during a first time slot of a transmission frame; and   a second beacon, wherein the second beacon generates a second positioning signal using a second pseudorandom number sequence, and wherein the second beacon broadcasts the second positioning signal during a second time slot of the transmission frame.   
     
     
         13 . The network of  claim 12 , wherein the first beacon optionally generates first assistance data, and wherein the second beacon optionally generates second assistance data. 
     
     
         14 . The network of  claim 12 , wherein the transmission frame is 1 second. 
     
     
         15 . The network of  claim 12 , wherein the first time slot and the second time slot are each 100 ms. 
     
     
         16 . The network of  claim 13 , wherein the transmission frame is 1 second. 
     
     
         17 . The network of  claim 13 , wherein the first time slot and the second time slot are each 100 ms. 
     
     
         18 . Computer-readable media embodying program instructions adapted to be executed to implement a method for generating and transmitting positioning signals using a network of terrestrial beacons, the method comprising:
 generating, at a first beacon, a first positioning signal using a first pseudorandom number sequence;   generating, at a second beacon, a second positioning signal using a second pseudorandom number sequence;   broadcasting the first positioning signal during a first time slot of a transmission frame; and   broadcasting the second positioning signal during a second time slot of the transmission frame.   
     
     
         19 . The computer-readable media of  claim 18 , the method further comprising:
 optionally generating first assistance data at the first beacon; and   optionally generating second assistance data at the second beacon.   
     
     
         20 . The computer-readable media of  claim 18 , wherein the transmission frame is 1 second. 
     
     
         21 . The computer-readable media of  claim 18 , wherein the first time slot and the second time slot are each 100 ms. 
     
     
         22 . The computer-readable media of  claim 19 , wherein the transmission frame is 1 second. 
     
     
         23 . The computer-readable media of  claim 19 , wherein the first time slot and the second time slot are each 100 ms.