[Image shows radar technician Chuck Clark controlling color radar display monitors showing Doppler reflectivity, velocity and spectrum width]
From left to right: Reflectivity, mean Doppler velocity, and spectrum width. The mean Doppler velocity and spectrum width data displayed in these color monitors are derived from the auto-covariance estimator, more commonly known as the pulse-pair-processor (PPP). Reflectivity comes from the logarithmic amplifier channel in which there is no AGC. Dale developed the pulse pair processor that served NSSL well for many years. It was the only one in the weather radar research community that also provided quantitative estimates of spectrum width. The pulse pair processor was also developed by Dale for the P-3.