Patent Document ID: 20040225438
Application ID: 10252110
Patent Flag: 0

Claim One:
1. A method of determining a value of an integer ambiguity of a carrier-based pseudorange measurement at a time epoch, wherein the integer ambiguity indicates an integer number of carrier wavelengths that the carrier-based pseudorange measurement is offset from an absolute pseudorange, the method comprising: (a) measuring the absolute pseudorange at the time epoch based on a received signal, thereby forming an absolute pseudorange measurement; (b) measuring a carrier-based pseudorange at the time epoch based on a carrier phase of the received signal, thereby forming the carrier-based pseudorange measurement; (c) estimating a probability that each of a plurality of candidate integer ambiguity values is a correct value of the integer ambiguity at the time epoch based on the absolute pseudorange measurement and the carrier-based pseudorange measurement, thereby determining which of the candidate integer ambiguity values is the most likely integer ambiguity value to be the correct value; and (d) selecting the most likely integer ambiguity value as the value of the integer ambiguity at the time epoch.