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Acutime 2000 Synchronization Kit User Guide A-41
A Trimble Standard Interface Protocol
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.
!
Note – GPS time differs from UTC by a variable integral number of
seconds. UTC = (GPS time) - (GPS/UTC offset).
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
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
Table A-29 Report Packet 40
Byte Item Type Units