On 2011.01.18 22:36 , macpacheco wrote:

CSACs might also make their way into all DPGS stations, improving
their calculated corrections. All current WAAS stations have a
standard Rb atomic clock (costs US$ 35000 each, lasting less than 10
yrs), replacing each Rb atomic clock with a triple redundant CSAC
facility will save a bundle on WAAS maintenance (with three clocks a
single faulty unit can be detected, excluded and marked for
replacement without stopping the station). Regular atomic clocks also
are temperature sensitive, requiring air conditioning, this CSAC can
handle temperatures from -10C to +50C.

The CSAC is not a deploy-able product. It has to be integrated into a
receiver. That, with design, integration, testing and certification
will drive up the cost considerably. The $1500 will go to about $10 -
$15K as an educated guess.

For a fielded WAAS station, the -10°C may be unacceptable. (There is
the military version which is likely more expensive, that goes lower,
-40°C).


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