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A-104 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
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.
38-41 Oscillator Drift
Uncertainty
SINGLE Oscillator bias rate 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
Table A-85 Report Packet 8F-0B (Continued)
Byte # Item Type Meaning