Abstract: Quantum navigation and positioning systems require a quantumsatellite information communication system for signal acquisition, tracking, and pointing (ATP). The ATP system is important for quantumsatellite information communication, which involves establishing a quantum communication link and resuming it. Cooperation between coarse and fine tracking can ensure that communication between the two parties attains the desired signaltracking performance. In this paper, we describe in detail the acquisition phase and the coarse tracing technique of quantumsatellite communication for quantum navigation systems. The initial pointing technique, scanning technique, precision and performance of the capture phase are analyzed. Stage precision, its performance index, and other key technologies are also discussed.

Key words: acquisition, coarse tracking, quantum navigation, scanning