[email protected] wrote:
Hi Nigel,
AMU and SNR are two different scales. I do not have a translation. A
Kepler award recepient once explained Trimbles AMU as "a meaningless
unit". That said, SNR or C/N0 values cannot be directly compared between
different receivers since the measures might be taken at different points
in the receiver.
AMU is just a scaled linear correlation measure. Either this is Ip or
the vector sum of Ip and Qp. Ip would suffice onces locked in. C/N
measure is a combination of that and that of the pre-correlator noise.
Wither this has been done or not is unknown.
The Trimble monitor program can be made to switch between AMU and SNR in
one of the configuration menues. I think you might have switched to SNR.
With above uncertanty of specific SNR definitions noted, most receivers
are enjoying an excellent signal if the highest elevation receivers have a
SNR above 50. If the highest SVs get +45dB that is still decent.
This is where C/N excel over AMU, it's easier to compare to other receivers.
Cheers,
Magnus
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