Chapter 6 ______________________________________________________ Processing Algorithms
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If the CSR is set too low you will notice an abrupt ring of missing data in
the beginning of the second trip. If set too high, there will be speckles and
other spurious effects within this same interval. The optimum setting
should strike a balance between these two effects.
R1 vs. R2 Algorithms
The Random Phase algorithms for adaptive filtering and separation of trips
relies on having the best possible information about the weather's SNR and
spectral width. Thus, the "R2" Doppler algorithms are always used,
regardless of the setting of the R1/R2 flag in the user's operational
parameters.
Random Phase and Dual PRF
The random phase processing works seamlessly with the dual PRF
processing to provide advanced range and velocity ambiguity resolution.
Both the first and second trip echoes can be recovered and displayed to a
maximum range of 2X the unambiguous range corresponding to the high
PRF.
For optimum performance, the 2D 3x3 speckle filter should be used to
smooth the second trip seams that occur for each ray. In fact, this
smoothing of the second trip seam makes the dual PRF random phase
mode work even better than the single PRF random phase.
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