Filter
Top Products
A-42 Acutime 2000 Synchronization Kit User Guide
Trimble Standard Interface Protocol
A
"
Caution – GPS week numbers run from 0 to 1023 and then cycles
back to week #0. Week #0 began January 6, 1980. Another week #0
began August 22, 1999. The receiver automatically adds 1024 to the
GPS week number after August 21, 1999, and reports the cumulative
week number.
The seconds count begins with "0" each Sunday morning at midnight
GPS time. A negative indicated time-of-week indicates that time is
not yet known; in that case, the packet is sent only on request. The
following table shows the relationship between the information in
packet 41, and the packet 46 status code.
!
Note – Before using the GPS time, verify that the packet 46 status
code is 0x00 ("Doing position fixes"). This ensures the most accurate
GPS time.
Table A-31 Relationship Between Packet 41 and Packet 46
Approximate Time
Accuracy
Time Source Sign
(TOW)
Packet 0x46
Status Code
None No time at all – 0x01
Unknown Approximate time from
real-time clock or packet 2E
+ 0x01
20 to 50 msec + clock
drift
Time from satellite + not 0x01
Full accuracy Time from GPS solution + 0x00