METEK Micro Rain Radar MRR-2 Page 29
2012-03-01 Valid for MRR Service Version 6.0.0.4 / Firmware 6.00
Sampling Frequency
Number of samples per second of the analogue input signal of the MRR-2.
Calibration Constant
This constant is needed for converting the engineering units of the receiver
signal (raw spectra) into physical units (processed and averaged data). See
Physical Basis for details. The calibration constant is factory set. Nevertheless
it can be changed by the experienced user. Before a new calibration constant
It should be only done
if there is clear evidence for a miss-calibration of the MRR. This can be
inferred for example from rain rates measured with the MRR (
It should be kept in mind that comparisons of rain rates measured aloft with
the MRR and a rain gauge are not straightforward due to the strong
inhomogeneity of rain. MRR data should be taken from range gates not below
the 3
rd
range gate because approximations in the radar equation cause larger
biases at lower range gates. On the other hand the measuring height should
not exceed 200 m in order to keep attenuation effects small (they are only
eliminated in case of correct calibration) and to keep the correlation with
surface precipitation at a useful level. Further make sure that the MRR rain
retrieval is not affected by the ice phase or melting processes. Strong winds
should also be avoided since rain gauges tend to be unreliable under such
conditions.
OK
All changes in the Device Parameters Menu become effective by clicking the
OK
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