RVP10 pulse pair time domain processing

Pulse pair processing is done by direct calculation of the autocorrelation.

Prior to pulse pair processing, the input I and Q values are filtered for clutter using a time domain notch filter, frequency domain fixed, or variable width filters. IIR filters of various selectable widths are available for either 40 dB or 50 dB stop band attenuation. The filtered I/Q values are processed to obtain the autocorrelation lags R0, R1, and R2. The unfiltered power is also calculated (T0). The autocorrelations are sent to the range averaging and moment extraction steps.