A ranging receiver (10) including a cellular module (11), for providing
time according to a positioning system to enable synchronizing a wireless system
to the positioning system. The ranging receiver (10) includes both the cellular
module (11) and a main module (12) that provides ranging receiver
functionality. When the cellular module (11) receives a time-stamped frame
from the wireless system, it sends a trigger signal over a special hardware path
to the main module (12), which then relates the time of trigger receipt
to time according to the positioning system by calculating a position-velocity-time
(PVT) solution, using a local clock (18) to get the difference in time between
receipt of the trigger and the instant to which the PVT solution applies, and then
communicates to the cellular module (11) when it received the trigger, according
to positioning system time.
