ADC blanking

23sep08
Links
17sep08: adc blanking with Faa, 1290, and  punta salinas radars. az=180,za=17 to  17.5


Intro.

    ADC blanking uses the digitized signal to determine whether to blank or not. If the digitizer exceeds the maximum value (ok maybe equals the maximum value)  then the current fft is marked as being blanked. All ffts marked as blanked will not be added to the accumulator.  Some properties of the adc blanking is:

17sep08: adc blanking with Faa, 1290, and  punta salinas radars. az=180,za=17 to 17.5    

    On 17sep08 data was taken using the galfacts configuration. The setup and telescope motion was:      Dynamic spectra were made for each 20 seconds worth of data. The calOn+calOff cycle was summed to give a 40 millisecond sampling. PolA and polB have been averaged. The top plot is the 172 MHz centered at 1450 MHz while the bottom plot is the 172 MHz centered at 1300 MHz.
   Dynamic spectra 20 seconds with blanking Off (40 ms resolution) (.gif):
   Dynamic spectra 20 seconds with ADC blanking on (40 ms resolution) (.gif):
    Dynamic spectra for 2,3 seconds where 1290,1330 radar are max.. 2 millisecond resolution (.gif)
Total power and spectra during the radar peaks (.ps) (.pdf):

Conclusions:

processing: x101/080917/alfablank.pro


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