Strapdown lnertial North and Latitude Finder

A device for determination of an initial latitude and heading is described. The device physically is based on the new method of initial latitude and known method of heading determination for the fixed base. The lnertial Measurement Unit is used for heading and initial latitude determination. The IMU is composed of accelerometers, gyroscopes and a signal processing circuit. It is shown that permanent base declination has no influence on the latitude determination. Error model of latitude determination method is developed. It is described that error of the latitude determination depends on errors of gyroscopes and accelerometers. The IMU experiments were conducted with ring laser gyroscopes and pendulum accelerometers. Experiments have demonstrated that using this method, the initial latitude can be received.