Trimble Outdoors Part Number 45005-00-ENG, AcutimeTM2000 Synchronization Kit Oscillator Drift

Trimble Standard Interface Protocol			A
Table A-85 Report Packet 8F-0B (Continued)
Byte #	Item	Type	Meaning
38-41	Oscillator Drift	SINGLE	Oscillator bias rate uncertainty
	Uncertainty		(meters/second)
42-49	Latitude	DOUBLE	Latitude in radians
50-57	Longitude	DOUBLE	Longitude in radians
58-65	Altitude	DOUBLE	Altitude according to current datum,
			meters
66-73	Satellite ID	8 BYTES	Identification numbers of tracking and
			usable satellites

Bytes 66 through 73 identify the tracking and usable satellites. A tracked satellite is distinguished from a usable satellite by a negative sign (−) appended to its PRN number.

In this superpacket, time is referenced to UTC to correspond to the default PPS timebase. To configure the receiver to output time relative to GPS, the PPS must be characterized accordingly. Command packet 8E-4A enables the PPS to be re-defined at run-time and stores the new settings in nonvolatile memory.

!Note – Leap seconds can not be predicted in advance using only the 8F-0B packet. A leap second can be identified by observing that the date does not increment after 86400 seconds have elapsed in the current day. The date rollover is delayed for the duration of the leap second, and the day/month/year count reported does not increment to the next day until the beginning of the second following the leap event. Decoding of the 8F-AD packet provides complete leap status information.

The UTC offset is incremented at the beginning of the first second following the leap second.

A-104 Acutime 2000 Synchronization Kit User Guide