An autocorrelation is computed on the inphase and quadrature data, using a standard pulse pair algorithm . The output of the standard pulse pair algorithm are the zeroth and first lag of the complex autocorrelation function: Rn(0) and Rn(Ts). The total received power is defined as: Pn = Rn(0), and the resultant vector of the lag one autocorrelation is defined as: Rn(Ts) = An + jBn; where n denotes the frequency number (1 £ n £ 5). The autocorrelation is performed simultaneously on all transmitted frequencies. Vector addition is performed across the frequencies, yielding resultant vector R(Ts) , as given by equation 1:
Scalar addition is performed across the frequencies yielding P:
N is the total number of transmitted frequencies.
The final data products are computed from (1) and (2) as follows:
Reflectivity is given by
where RC is the radar constant and r is the range in km.
Mean velocity is determined by taking the argument of the first autocorrelation lag,
Spectrum width is computed as follows:
where
N is the noise power.
Normalized coherent power is defined as the ratio of the power calculated at lag one and the total received power:
It should be noted that the value of l used is the average of all transmitted frequencies.
