Furuno WR2120 Operator's Manual page 32

Kdp output threshold (Kdp) [deg/km]:
Setup Kdp value of Signal processing to calculate Propagation phase difference rate of change
Kdp[deg/km]. The default value is 0.3 [deg/km]. Lower than default value is not recommended.
Kdp output threshold (Zh) [dBZ]:
Setup Zh value of Signal processing to calculate Propagation phase difference rate of change
Kdp[deg/km]. The default value is 30 [dBZ]. Lower than default value is not recommended.
Zh attenuation estimation coefficient (b1) (b2):
Setup two types of the signal processing coefficients (b1, b2) to calculate the rainfall attenuation for
Zh.
Zdr attenuation estimation coefficient (d1) (d2):
Setup two types of the signal processing coefficients (d1, d2) to calculate the rainfall attenuation for
Zdr.
Air attenuation coefficient (AGAS) [dB/km]:
Setup the coefficient to attenuate the air.
Radiowave extinction threshold [dBZ]:
Setup a value for whether or not to determine signal extinction which compare with a signal
extinction and a value comes with rainfall attenuation value (Ah) and propagation phase difference
rate (Kdp).
R (Zh)-method coefficient (B):
These are parameter of Z-R relation: Z = BR^β
Here, Z [mm^6/m^3] is reflectivity factor and R [mm/h] is rainfall intensity. The default value for rain
is 200 and 1.6, respectively.
Enter a value for Z-R relationship parameter of "B" coefficient.
R (Zh)-method coefficient (β):
Enter a value for Z-R relationship parameter of "β (Beta)" coefficient.
R (Kdp)-method coefficient (a), (b), (c):
a, b, c are setting for the coefficient to calculate Kdp[deg/km] to rainfall intensity R (Kdp)[mm/h].
b
Calculation method: Rain (Kdp) = c ×a×Kdp
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