Patent ID: 8239133

Claim:
A global positioning system and dead reckoning (GPS&DR) integrated navigation system comprising: a GPS receiver coupled to a moving object for periodically calculating GPS navigation information of said moving object according to satellite signals; a DR system coupled to said moving object for periodically calculating DR navigation information of said moving object by integrating moving information of said moving object with reference position and orientation from said DR system; a filter coupled to said GPS receiver and said DR system for periodically calculating navigation information of said moving object, wherein said filter gets observation information by integrating said GPS navigation information and said DR navigation information according to a weight value of said GPS navigation information and a weight value of said DR navigation information, and said filter calculates a current navigation information by integrating said observation information with previous navigation information from a plurality of previous cycles; and a weight module coupled to said GPS receiver for calculating said weight value of said GPS navigation information and said weight value of said DR navigation information based on the number of said satellite signals with a carrier-to-noise ratio above a first predetermined threshold.