Abstract: In order to guarantee high-accuracy navigation independent of GPS/GLONASS during long time and long range running, a combined land navigation system using the odometer(OD) and geographic information system(GIS) assisted with the laser-gyro strapdown inertial navigation system(LSINS/OD/GIS) is described in this article. Based on error estimation equation, an automatic zero updating function and odometer parameter calibration and the navigation azimuth error correction by GIS position information synthetically are proposed, using the GIS position information and possible temporary parking states. The results of accuracy verification test are also presented, indicating divergent velocity of main errors has been effectively reduced.

Key words: laser-gyro strapdown inertial navigation system, odometer, geographic information system, land navigation system