[time-nuts] Jupiter GPS receiver
Alberto di Bene
dibene at usa.net
Thu Jan 5 13:02:25 EST 2006
Magnus Danielson wrote:
>>I looked in my data and their spec sheet shows +/- 1 microsecond. But,
>>I beleive this was much better than that. I cannot find it, but I
>>beleive I seen a report where somebody compared the Jupiter and it was
>>in the 120 to 150 nanosecond class.
> +/- 1 microsecond is the old worstcase garantee for the GPS system. It is was
> you can expect from a GPS with lack of satellites, SA and old style satellites
> going out of date in their predicted orbits data.
> These days we have better satellites, full system and no SA. Add to that much
> improved receivers (no more 1 channel receivers as in the good old days).
Brian and Magnus,
thanks for your input. It looks like I can, after all, use that Rockwell board
without resorting to huge integration times for the 1pps signal.
Just curious on another topic : I have seen advertized GPS boards with 20-channel
capability, Given that, at least based on my direct experience, even with a clear
horizon you rarely have 12 satellites in view, what does buy you having that
capability available? TNX.
73 Alberto I2PHD
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