On Sun 2004-02-15T12:10:17 +0000, Markus Kuhn hath writ: > The GPS signal format has been virtually unchanged since prototype > experiments in the early 1970s
I'm just now reviewing the very recent GPS L2 ICD https://gps.losangeles.af.mil/Gpsarchives/1000-public/1200-cm/documents/review/icdgps200/pirn200c008/PIRN-200C-008,%2027Jan2004.pdf An insignificant difference is the blue-pencilling of all occurrences of "Universal Coordinated Time" and replacement with "Coordinated Universal Time. A significant difference is that there is now a 16-bit field intended to give the calendar year. This will certainly alleviate any need to worry about violating the week rollover patent that Tom Van Baak mentioned a while back. But I still find no indication that the leap second counters have a different width. That would leave the GPS receiver implementor with a need to guess the value of Delta-T to within 256 seconds. Fortunately that will be a relatively robust guess for many, many centuries. -- Steve Allen UCO/Lick Observatory Santa Cruz, CA 95064 [EMAIL PROTECTED] Voice: +1 831 459 3046 http://www.ucolick.org/~sla PGP: 1024/E46978C5 F6 78 D1 10 62 94 8F 2E 49 89 0E FE 26 B4 14 93