System and/or method for reducing ambiguities in received SPS signals

Abstract

The subject matter disclosed herein relates to a system and method for resolving ambiguities associated with signals received from space vehicles (SVs) in a satellite navigation system.

1 . A method comprising:
 determining timing of a bit edge of a data signal modulating a first navigation signal received at a reference location; and   determining timing of transitions in an alternating viterbi encoded signal modulating a second navigation signal received at said reference location based, at least in part, on said timing of said bit edge.   
     
     
         2 . The method of  claim 1 , wherein said first navigation signal is transmitted by a first space vehicle (SV) and said second navigation signal is transmitted by a second SV, and wherein said determining said timing of said transitions further comprises associating said timing of said bit edge with said timing of said transitions based, at least in part, on an estimated difference between a first range to said first SV from said reference location and a second range to a second SV from said reference location. 
     
     
         3 . The method of  claim 2 , wherein said first SV is a member of a GPS constellation and said second SV is a member of a Galileo constellation. 
     
     
         4 . A mobile device comprising:
 A baseband processor and a correlator configured to:   determine timing of a bit edge of a data signal modulating a first navigation signal received at a reference location; and   determine timing of transitions in an alternating viterbi encoded signal modulating a second navigation signal received at said reference location based, at least in part, on said timing of said bit edge.   
     
     
         5 . The mobile device of  claim 4 , wherein said first navigation signal is transmitted by a first space vehicle (SV) and said second navigation signal is transmitted by a second SV, and wherein said determining said timing of said transitions further comprises associating said timing of said bit edge with said timing of said transitions based, at least in part, on an estimated difference between a first range to said first SV from said reference location and a second range to a second SV from said reference location. 
     
     
         6 . The mobile device of  claim 5 , wherein said first SV is a member of a GPS constellation and said second SV is a member of a Galileo constellation. 
     
     
         7 . A mobile device comprising:
 means for determining timing of a bit edge of a data signal modulating a first navigation signal received at a reference location; and   means for determining timing of transitions in an alternating viterbi encoded signal modulating a second navigation signal received at said reference location based, at least in part, on said timing of said bit edge.   
     
     
         8 . The mobile device of  claim 7 , wherein said first navigation signal is transmitted by a first space vehicle (SV) and said second navigation signal is transmitted by a second SV, and wherein said determining said timing of said transitions further comprises associating said timing of said bit edge with said timing of said transitions based, at least in part, on an estimated difference between a first range to said first SV from said reference location and a second range to a second SV from said reference location. 
     
     
         9 . The mobile device of  claim 8 , wherein said first SV is a member of a GPS constellation and said second SV is a member of a Galileo constellation. 
     
     
         10 . A non-transient computer readable medium comprising instructions which, when executed by a processor, cause the processor to:
 determine timing of a bit edge of a data signal modulating a first navigation signal received at a reference location; and   determine timing of transitions in an alternating viterbi encoded signal modulating a second navigation signal received at said reference location based, at least in part, on said timing of said bit edge.   
     
     
         11 . The non-transient computer readable medium of  claim 10 , wherein said first navigation signal is transmitted by a first space vehicle (SV) and said second navigation signal is transmitted by a second SV, and wherein said determining said timing of said transitions further comprises associating said timing of said bit edge with said timing of said transitions based, at least in part, on an estimated difference between a first range to said first SV from said reference location and a second range to a second SV from said reference location. 
     
     
         12 . The non-transient computer readable medium of  claim 11 , wherein said first SV is a member of a GPS constellation and said second SV is a member of a Galileo constellation.