Vaisala RVP900 - Burst Pulse Analysis for Amplitude, Frequency, and Phase; Figure 13 Burst Pulse Analysis for Amplitude;Frequency;Phase

• Particle identification
• Target detection and tracking
• General weather monitoring
Processing Modes
RVP900 has several major processing modes options for obtaining basic moments:
• Pulse pair mode time domain processing
• DFT/FFT mode frequency domain processing
• Random phase mode for second trip echo
filtering
• Polarization mode processing
RVP900 performs discrete Fourier transforms (DFT) and fast Fourier transforms (FFT). FFT
is more computationally ecient than DFT, but the sample size is limited to a power of two
(16, 32, 64, and so on.) This is too restrictive on the scan strategy for a modern Doppler
radar since this means, for example, that a 1° azimuth radial must be constructed from
exactly 64 input I/Q values. RVP900 has the processing power such that when the sample
size is not a power of two, a DFT is performed instead of an FFT.
More Information
‣
RVP Algorithm Overview (page 169)
3.3.1
Burst Pulse Analysis for Amplitude, Frequency, and Phase
Figure 13 Burst Pulse Analysis for Amplitude/Frequency/Phase
The burst pulse analysis provides the amplitude, frequency, and phase of the transmitted
pulse.
The phase measurement is analogous to the COHO locking that is performed by a traditional
magnetron radar. The dierence is that the phase is known in the digital technique, so that
range de-aliasing, using the phase modulation techniques, is possible.
RVP900 User Guide M211322EN-J
42