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## Data Collection OperationsModes The WSR-88D has The VCP numbers come from several groups. Each group name implies an intended use, but there is some overlap in applications for each VCP. 1. 2. 3. 4. The Multiple PRF Dealiasing Algorithm (MPDA) is part of VCP 121 processing. MPDA reduced range folding by processing additional Doppler rotations at lower elevation angles. The Sachinananda-Zrnic (SZ-2) technique is implemented for the lower two or three elevations for VCPs 211, 221, and 212. When echoes are overlaid, SZ-2 can usually recover velocity data for two of the overlaid range bins. SZ-2 is also used for one of the Doppler rotations at 0.5 and 1.5 degrees with VCP 121. Antenna Rotation Rates The antenna rotates at different speeds depending on the VCP. VCPs 31 and 32 have the slowest antenna speeds, ranging from 71 to 89 seconds for one rotation. In Clear Air mode, the antenna rotates slowly to maximize the number of pulses on target as possible which increases the statistical accuracy of the data. VCPs 12 and 121 have the fastest antenna speeds, ranging from 12 to 22 seconds for one rotation. Next Page: WSR-88D Waveforms |