Autonomous Determination of Vehicle Longitude

Paper deals with an algorithm for obtaining the vehicle’s longitude. Methods of full autonomous determination of initial positioning are represented. The process describes the longitude determining designed on the initial latitude obtaining. The strap-down inertial technology is used for initial latitude determination. The inertial measurement unit should be consisted of a set of gyroscopes and accelerometers. The longitude determination is described for both ways of moving base - orthodromic and loxodromic movements. The error of longitude determination is derived. It is shown that the error model depends on azimuth and latitude errors.