Method and system for synchronizing receiver systems of a wireless location system
AssigneeTruePosition, Inc.
InventorLouis A. Stilp
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Abstract
In a wireless location system (WLS) including a plurality of geographically separated receiver systems, a system for synchronizing the respective receiver systems includes the use of an enhanced GPS receiver including a mechanism for receiving GPS signals and removing at least a portion of the timing instability of the GPS signals. An output of the enhanced GPS receiver is provided to a low phase noise phase-locked loop circuit that is used to produce reference signals with less than 0.01 degrees RMF of phase noise.
Claims20
A receiver system including an external synchronization capability, the receiver system being employed in a wireless location system (WLS) and comprising:
- (a) an enhanced GPS receiver including means for receiving GPS signals and a mechanism for removing at least a portion of any timing instability of the GPS signals, and (b) a low phase noise phase-locked loop circuit;
- wherein the output of the enhanced GPS receiver is input to the phase-locked loop circuit, and wherein the phase-locked loop circuit produces reference signals with less than 0.01 degrees RMS of phase noise.
A wireless location system (WLS) comprising a plurality of signal collection systems (SCSs), wherein each SCS comprises a receiver system including an external synchronization capability, the receiver system comprising an enhanced GPS receiver including means for receiving GPS signals and a mechanism for removing at least a portion of any timing instability of the GPS signals, and wherein the enhanced GPS receiver further includes a mechanism for outputting a periodic reference pulse that is within ten nanoseconds of the reference pulse produced by the receiver system(s) in other SCS(s) of the WLS.
A method for synchronizing multiple, geographically separated receiver systems in a wireless location system (WLS), comprising:
- in each receiver system, employing an enhanced GPS receiver to generate a reference signal with less than 0.01 degrees RMS of phase noise, and employing said reference signal in each receiver system to generate a clock signal that is substantially synchronized with the clock signals generated in other receiver systems of the WLS.
Dependencies are inferred from the claim text.