Is the above understod correctly? Cause if not.... I have absolutely no idea how the receiver would know time in the first place.... without going through position first....
The receiver has its own clock. The satellites contain atomic clocks but the receiver contains a quartz clock which is not accurate enough initself but does have the quality of running at a stable rate. In theory the range from 3 satellites provides a position but the position is false due to clock error so the psuedo-range from a fourth satellite is required resulting in a 'cocked hat' which is solved mathematically, determining the clock error in the process. When the receiver is off, its time keeping will diverge from GPS time but when it starts again the error will be dealt with in the manner just described.