This paper presents deep research of the Strap-down Inertial Navigation System (SINS) and the Global Positioning System (GPS) separately, and then discusses the GPS/SINS Integrated Navigation System.

A new fusion algorithm of the measurements from global positioning system (GPS) and inertial navigation system (INS) is presented to compensate the weaknesses of current integrated navigation system.

The experiment data of GPS/INS integrated navigation system as well as main error source of inertial parts has been analyzed.