摘要: The OMNISTAR Virtual Base Station system was developed in 1990 to provide users reliable differential GPS corrections for high accuracy real time applications. At the present there are two systems covering continental United States and whole of Australia New Zealand. delivers its via geostationary satellites, thus providing seamless coverage over entire service areas. is unique that from network used user solution order generate RTCM corrections, unit provides a engine as if base station were within kilometer position. This paper will describe system. It show results have been accumulated last four years demonstrates dependent upon quality receiver.