Navigation and positioning by using the insufficient geomagnetic components

Geomagnetic field information of the vehicle contains abundant positional information, so the positional information can be derived from the geomagnetic observational value. Firstly, base on the analysis of geomagnetic maps of southeast China, the least square algorithm is used for modeling the local geomagnetism on 3'x3' WMM2010(world magnetic model)database. Then, the optimal positional model can be derived. The simulation has been done, from the simulation results we can see that the mean- squared error of the model in latitude and longitude are about 0.7062 sea mile and 1.8735 sea mile respectively. At last, according to the shortcoming of geomagnetic course system such as costing more time and money in calibration error, the partial geomagnetic field model is applied on correcting the compass variation. The analysis of simulation result indicates that the accuracy has been significantly improved.