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List:       elecraft
Subject:    Re: [Elecraft] Rubidium vs cesium
From:       "Peter Eijlander (PA0PJE)" <pa0pje () xs4all ! nl>
Date:       2014-11-28 23:38:20
Message-ID: 5479076C.9070206 () xs4all ! nl
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Hi Ken,

well...

In the past there were both 2 caesium and 2 rubidium clocks on board,
according to this paper:

http://www.insidegnss.com/auto/Sept06GNSS_Solutions_secure.pdf

GPS satellites used to carry two caesium and two rubidium atomic
standards on board.
Subsequently, GPS switched to all rubidium clocks.
Galileo plans to use hydrogen masers instead.

73,
Peter - PA0PJE


Op 28-11-14 om 22:43 schreef Ken G Kopp:
> An alert reader has caught my error in naming the type of standard
> used in the GPS satellites.   It's indee "rubidium" and not
> "cesium".
>
> 73
>
> Ken - K0PP
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