NAVIGATION SYSTEM AND METHOD FOR RESOLVING INTEGER AMBIGUITIES USING DOUBLE DIFFERENCE AMBIGUITY CONSTRAINTS

摘要

A system and method for providing improved correction information to navigation receivers (120) includes receiving from a plurality of reference stations (140 1 340 2 I40 M) at known locations a plurality of satellite navigation measurements of signals from a plurality of global navigation satellites (110 1 110 2 110 M). A state of the plurality of global navigation satellites (110 1 110 2 110 N) is computed based on the received satellite navigation measurements. Baselines each corresponding to a pair of the reference stations (140 1 140 2 140 M) are identified. For each identified baseline computing floating and integer1 values for a double differenced integer ambiguity . Double differenced integer ambiguities that satisfy a set of predefined conditions are identified and the computed state of the plurality of global navigation satellites (1104 110 2 110 N) is adjusted in accordance with an integer value constraint applied to each double differenced integer ambiguity that satisfies the set of predefined conditions. The correction information is computed from the adjusted computed state of the plurality of global navigation satellites (110 1 110 2 T10 N)