Clutter correction (CCOR threshold)

The following content is based on legacy implementation in which R1 , and R2 are defined in terms of PPP (pulse-pair-processing).

Current major modes use FFT ( DFT) processing instead.

In addition to calculating the R0, R1 and optional R2 autocorrelation terms, which are based on filtered time series data, RVP10 computes T0 , which is the total unfiltered power.

By comparing the total filtered and unfiltered powers at each range bin, a clutter power, and hence a clutter correction, for that bin can be derived. The clutter correction is defined as,

C C O R = 10 log ⁡ S C + S = 10 log ⁡ 1 C S R + 1

where S is the weather signal power, C is the clutter power and CSR is the clutter-to-signal ratio.

The algorithm for calculating CCOR depends on whether the optional R2 autocorrelation lag is computed.