The distance between range gates was 105 meters for the 100 meter mode, and 255 meters for the 500 meter mode. It should be noted that the 500 meter mode has a radar pulse length of 495 meters and range gate spacing of 255 meters. This means that the atmosphere is over sampled and adjacent observations are not independent. In contrast, the 100 meter mode has independent observations due to the 105 meter pulse length and 105 meter range gate spacing. Coherent integration is the process of averaging consecutive samples and using this average in subsequent processing.
Coherent integration is essentially a digital filtering process used by profilers.
One side effect of using coherent integration is the decreased power return at frequencies different than zero Doppler shift. 2 V Nyquist velocities. This TDA filter will be discussed in more detail when the equivalent reflectivity factor is determined from the Doppler Spectra. After NCI consecutive samples are averaged together, this one averaged datum constitutes one value in a time series of observations. The next NCI consecutive samples are averaged.