Simulation analysis of performance of COMPASS and its augmentation system

Software is compiled to simulate COMPASS constellation with 12 satellites and GPS constellation. Based on 18 stations of the Asia-Pacific region, satellite visibility, dilution of precision (DOP) and constellation availability of COMPASS and integrated COMPASS/GPS are calculated and analyzed in detail. Simulation results reveal that the constellation performances, such as satellite visibility, DOP and availability, of COMPASS are good under the low mask angle such as 10 degrees, but the performances have a trend of becoming bad with the increase of mask angle. Under the condition, the augmentation of COMPASS by GPS is recommended. Simulation results reveal that the constellation performances will be improved greatly under the high mask angle, especially in the middle high latitudes.