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#11
March 25th 08, 03:37 AM
posted to rec.radio.amateur.moderated
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WPM to BPS calculation
Phil Kane wrote:
On Mon, 24 Mar 2008 00:10:13 EDT, wrote: Each GPS sattelite has it's own on board atomic clock and the system can easily provide UTC with accuracy on the few microseconds level with an ultimate limit of +/- 340 nanoseconds using an appropriate receiver and hardware. Something must have changed (or been fixed) then - we made measurements about three years ago and there was about six seconds offset - an eternity for accurate time measurements. 340 nanoseconds we can tolerate. Six seconds we can't. -- The only thing that has changed since the first sattelite launched is that the accuracy degrading dither for civilian use was removed about 7 years ago. With the dither the time accuracy was in the range of tens of microseconds. Whereever you were getting your six seconds of error from, it wasn't from the GPS system. -- Jim Pennino Remove .spam.sux to reply. |
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