Trimble Outdoors AcutimeTM2000 Synchronization Kit manual 0x41, GPS Time Report, Report Packet

A			Trimble Standard Interface Protocol
Table A-29 Report Packet 40
Byte	Item	Type	Units
23-26	square_root_A	SINGLE	(meters)1/2
27-30	OMEGA_0	SINGLE	radians
31-34	omega	SINGLE	radians
35-38	M_0	SINGLE	radians

T_zc is normally positive. If no almanac data is available for this satellite, then T_zc is negative. T_zc and the week number in this packet refer to the Z-count time and week number at the time the almanac was received. The remaining items are described in the ICD-GPS-200.

0x41

!

Report Packet 41

GPS Time Report

This packet provides the current GPS time of week and the week number. The GPS receiver sends this packet in response to packet 21 and during an update cycle. Update cycles occur approximately every 15 seconds when not doing fixes and occur approximately every 150 seconds when doing fixes. The data format is shown below.

Table A-30 Report Packet 41

Byte	Item	Type	Units
0-3	GPS time of week	SINGLE	seconds
4-5	GPS week number	INTEGER	weeks
6-9	GPS/UTC offset	SINGLE	seconds

Note – GPS time differs from UTC by a variable integral number of seconds. UTC = (GPS time) - (GPS/UTC offset).

Acutime 2000 Synchronization Kit User Guide A-41