The Coarse-Position-Free Coarse-Time Positioning Method for BDS Receiver

Table 1

Different types of code phase observations generated by BeiDou receiver at different positioning stages.

positioning stages	BeiDou MEO satellite	BeiDou IGSO satellite	BeiDou GEO satellite
Signal acquisition	Sub-1 ms code phase	Sub-1 ms code phase	Sub-1 ms code phase
Bit synchronization	Sub-20 ms code phase	Sub-20 ms code phase	Sub-2 ms code phase
Frame synchronization	Complete pseudorange	Complete pseudorange	Complete pseudorange