Navigation algorithm of three antenna satellite compass

A navigation algorithm of three antenna satellite compass is proposed in this paper. The method is based on space-difference scheme to resolve the integer ambiguity problem. The three GPS antennas form two vectors with an angle of 60 deg, one of which points to the navigation course. For each vector, three double difference equations of the carrier phase measurements can be obtained from four satellites. Then through space-difference of the two vectors, the integer ambiguity and biases can be eliminated. Therefore the vector which indicates the course can be calculated. The stimulation results show that the algorithm is practical and accurate, the azimuth angle can be less than 1 deg.