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C-Band Dopplerradar

                                                          
                                                          C-Band Doppler radar at research center Karlsruhe

Specifications

Device Type:


C-Band* Doppler*-Radar*

Manufacturer:

Gematronik GmbH, Neuss

Location:

Institute for Meteorology and Climate Research, research center Karlsruhe/ University of Karlsruhe

Geographic coordinates:

8 deg 26' 13" E ; 49 deg 5' 33" N
148 meters above sea level, 38 meters above ground.

Gauss-Krüger:

3458.6 E; 5439.6 N

Frequency:

5620 MHz

Wavelength:

5.4 cm

Peak pulse power:

250 kW (84.2 dBm)

Pulse repetition rate:*

250 bis 1150 Hz

Pulse duration:

0.85 µs (short pulse)
2.0 µs (long pulse)

Beamwidth at -3 dB:

0.98 Grad (main lobe)

Antenna diameter:

4.2 m

Gain:

44.7 dB

Sensitivity (MDS at 10 km):

-109 dBm

Range:

120 km (rain and wind measurement), full volume
300 km (reflectivity), PPI

Measured values:

Reflectivity*, radial Wind

Derived values

Precipitation intensity*, vertical liquid content,
wind profile

Clutter suppression:

IIR high pass Doppler filter (# 3 of 8)

Scan mode (cyclically every 10 minutes):

1. Full volume (Z* and V) with 15 elevations* at 0.4, 1.1,
2.0, 3.0, 4.5, 6.0, 7.5, 9.0, 11.0, 13.0, 16.0, 20.0, 24.0 and
30.0 degrees, 120 km radius,
2. PPI* (Z*) at 1.0 degrees, 250 km radius
3. Another volumscan (only Z*) with 15 elevations * at 0.4,
1.1, 2.0, 3.0, 4.5, 6.0, 7.5, 9.0, 11.0, 13.0, 16.0, 20.0, 24.0
and 30.0 degrees, 120 km radius,

Resolution:
radial:
azimuthally*:


500 m
1.0 degrees

Derived products:

500 m x 500 m

Displayable items:

PPI*,
RHI,
CAPPI*,
MAX CAPPI*,
vertical sections,
Echotop,
Echobase,
VAD,
VVP*,
SRI* (surface rain intensity -> "horizontal" section 
of the rain rate at a constant height above ground,
following the orography),
PAC, PAL (total precipitation, accumulation
several SRI)

Formats:

1. Raw data in polar coordinates (HEX),
2. Products in Cartesian coordinates (HEX and GIF),
3.  Precipitation as raster data, or as point-like value
of a virtual ground station (ASCII)

Storage:

Raw data of all precipitation events (Z and V),
SRI and VVP all events,
PAC of all events generated by various
criteria as well as daily and monthly PAC

Calibration:

Monthly with a signal generator

Offline adjustment:

1. Regular adjustment of precipitation measurement with 
orographic unaffected orografisch ground stations within
120 km
2. Regular control of solar signal intensity

Platform:

UNIX 10.20, X11 Release 5 und Motif 1.2
Evaluation software: Rainbow 3.4
* Explanations of these terms.