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FIGURE 1 COMPASS Navigation Satellite System.


Phase II of COMPASS aims at meeting users’ demands in the Asia-Pacific region (Figure 2). A constellation made up of 12 satellites will be put in place before 2012. By then, the COMPASS system with RDSS and RNSS will be able to provide users with continuous positioning, velocity measurement, and location report services. COMPASS will achieve compatibility with GPS and provide equivalent accuracy as GPS.

Phase III of COMPASS is to establish a global constellation with 30 to 35 satellites by 2020 (Figure 3). It adopts RDSS and RNSS as well. As a member of the GNSS community, COMPASS will achieve compatibility and interoperability with GPS and Galileo within multi-frequency bands.



RDSS can provide information of both the user’s location and time parameters (X, Y, Z, T). It can provide location reports among the users, short message and timing services at the same time.

RNSS can provide user’s location, velocity, and time parameters (X, Y, Z, Vx, Vy, Vz, T).

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