get the best and fastest answer
|
|
|
|
Clear questions and runnable code get the best and fastest answer |
|
| PerlMonks |
Re^6: Converting GPS seconds to readable time&dateby n3toy (Hermit) |
| on Jan 11, 2009 at 23:45 UTC ( #735580=note: print w/replies, xml ) | Need Help?? |
|
If you have a good GPS device that's meant to do time-transfer
I do, and their (I have two, and neither have a display) PPS accuracy is within 20 nanoseconds of UTC (assuming you have accounted for the cable length from the antenna to the device). But the time displayed on a typical handheld consumer GPS for LBS (location based servies) are not "accurate" to that level. (Although some quality handheld GPSs have a PPS (Pulse Per Second) that probably meet the specs you quote.) It is good enough to check against a known source to see if it is outputting UTC or GPS, as per the node I was commenting on. The time displayed on a handheld GPS is derived from the processing of C/A code and is "old" by the time the display is updated. But you are correct in that time-transfer is the whole foundation behind GPS, and LBS is only an application of the system.
In Section
Seekers of Perl Wisdom
|
|
||||||||||||||||||||||||