> FYI -- Note that between 10,000 and 100,000 seconds, the uncalibrated > diurnal ionosphere signature just about doubles the noise level. The > GPS broadcast signals contain an approximate ionosphere correction > that is based on sunspot count, and most receivers follow the GPS > ICD200 "recipe". However, this "cookbook" correction makes no attempt > to calibrate for day/night variations, or the variation of the > ionosphere with latitude. This typically gives rise to a diurnal clock > signal that is 10-20 nsec in size.
Neat. Thanks. Is there a corresponding position shift between day and night? Which direction? Could I get better results if I ran the typical survey step twice, once during the day and again at night, and swapped between them at sunset and sunrise? -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
