GPS receiver having DR sensor signal sampling function

A navigation system includes a GPS receiver and a host CPU having a serial interface. The GPS receiver includes a sampling system which samples DR sensor signals at a sampling rate of 60Hz, and an outputting system which outputs a GPS solution and the sampled data of the DR sensor signals in 1 second cycle in a form of serial data. The host CPU receives a plurality of the sampled data of the DR sensor signals and the GPS solution through the serial interface thereof in 1 second cycle and estimates a location of a vehicle based on the GPS solution and a DR solution.