Finally got the 3-cornered-hat measurement of the IFRs done. The result is attached.
s12, s23, & s31, are the beat signals between the 3 signal generators.
s1, s2, & s3 are the phase noise of the individual generators made by the following matlab calculation:
`%% Do the hat`
`s1 = sqrt((s12.^2 + s31.^2 - s23.^2) / 2);`
s2 = sqrt((s12.^2 + s23.^2 - s31.^2) / 2);
s3 = sqrt((s31.^2 + s23.^2 - s12.^2) / 2);
As you can see, there is now an estimate of the individual noises. We can do better by doing some fitting of the residuals.
The real test will be to replace the noise one here with the good Wenzel oscillator and see how well we can estimate its noise. If the 11 MHz crystals don't show up, I can just try this with the 21.5 MHz one for the PSL. |