TIME

1. Consider the case where you used the ADJUST1PPS command to synchronize two receivers in a primary/secondary relationship to a common external clock. You can use the TIME log after the clock model status is valid to monitor the time difference between the Primary and Secondary receivers.

2. The header of the TIME log gives you the GPS reference time (the week number since January 5th, 1980) and the seconds into that week. The TIME log outputs the UTC offset (offset of GPS system time from UTC time) and the receiver clock offset from GPS system time.

If you want the UTC time in weeks and seconds, take the week number from the header. Then take the seconds into that week, also from the header, and add the correction to the seconds using the 2 offsets. Ensure not to go negative or rollover (go over the total number of seconds, 604800, in a week). In the case of a rollover, add a week and the left over seconds become the seconds into this new week. If negative, subtract a week and the remainder from the seconds of that week become the seconds into this new week.

For example:

TIME COM1 0 73.5 FINESTEERING 1432 235661.000 02000000 9924 2616 VALID -0.000000351 0.000000214 -14.00000000106 2007 6 19 17 27 27000 VALID

From the time information above:

GPS reference time = 1432 (GPS reference week), 235661.000 (GPS seconds) from the header.

From the description in UTC offset row in the following table:

UTC time = GPS reference time - offset + UTC offset
UTC time

= week 1432, 235661.000 s – (- 0.000000351 (offset) ) - 14.00000000106 (UTC offset)
= week 1432, seconds 235647.00000034994