User's Manual Part 2

Processing Algorithms (draft)
RVP8 User’s Manual
April 2003
5–54
Case 1V: Fixed Vertical Transmit and Dual Channel ReceiveĆ (VV, HV)
dBZo from VV Channel TTY Setup Question Responses
Calculate T, Z, V, W from: H–Xmt V–Xmt Co–Rcv Cx–Rcv
VV (co) ––– ––– YES NO
HV (xdr weighting) ––– ––– NO YES
VV+HV (xdr weighting) ––– ––– YES YES
This is the only case for which the calibration constant dBZ
o
for the VV channel should be
downloaded to the signal processor.
VV Channel (co–pol)
This is the recommended channel for the case of linear polarization. The reason is that for linear
polarization, the co-polar channel will have the strongest signal. Processing is identical to a
conventional radar.
HV Channel (cross–pol)
This choice would be used for circular or elliptic transmit polarization when most of the return is
in the cross-pol channel. Since the algorithm assumes that dBZo is from the co-polar channel,
xdr is used to adjust the autocorrelations as follows:
T
0
Ą +Ą xdrĄT
hv
o
R
0
Ą +Ą xdrĄR
hv
o
R
1
Ą +Ą xdrĄR
hv
1
R
2
Ą +Ą xdrĄR
hv
2
NĄ +Ą xdrĄN
h
These adjusted autocorrelations are then used as per the standard moment processing with dBZo
calibrated with respect to the VV channel.