L1 SFMC SBAS Positioning on Android Device: 1. It is a practical technique that improves GNSS position accuracy of Android device. Correction Message Generation for GLONASS and BeiDou: 1. Satellite Error Corrections from precise products with APC offset and DCB; 2. Ionospheric Correction from the vertical delay at IGPs of current SBAS systems. Advantages of L1 SFMC SBAS: 1. L1 SFMC SBAS can provide differential corrections of 3 constellations with only 250 bps; 2. In case of mask angle of 30 degrees, positioning available time increased from 73% to 100% compared to the current SBAS; 3. Also, horizontal and vertical errors are reduced from 5.0m and 13.9m to 1.9m and 3.7m, respectively.
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