Metek MRR-2 Manual de usuario
2012-03-01 Valid for MRR Service Version 6.0.0.4 / Firmware 6.00
MRR-2
Micro Rain RADAR
User Manual
2012-03-01 Valid for MRR Service Version 6.0.0.4 / Firmware 6.00
2012-03-01 Valid for MRR Service Version 6.0.0.4 / Firmware 6.00
METEK
Meteorologische Messtechnik GmbH
Fritz-Strassmann-Strasse 4
25337 Elmshorn
Germany
Fon +49 4121 4359-0
Fax +49 4121 4359-20
e-mail info@metek.de
internet http://www.metek.de
Copyright: © 2012 METEK GmbH
All Rights reserved. No part of this manual may be reproduced, transmitted,
stored in a retrieval system, nor translated into any human or computer
language, in any form or by any means, electronic, mechanical, optical,
chemical, manual, or otherwise, without the prior written permission of the
copyright owner.
Page 4 Micro Rain Radar MRR-2 METEK
2012-02-29 Valid for MRR Service Version 6.0.0.3 / Firmware 6.00
Table of Contents
1Safety Precautions ...............................................................................6
2How to use this manual .......................................................................7
3Measuring Principle .............................................................................8
4System Description.............................................................................. 9
4.1 Overview ................................................................................................9
4.2 Description of the Components ............................................................10
4.2.1 Parabolic Dish ...................................................................................10
4.2.2 Antenna Heating (Option)..................................................................10
4.2.3 RADAR Control and Processing Device and Transceiver ................11
4.2.4 Junction Box / Power Supply.............................................................12
4.2.5 Control Cable and Serial Cable .........................................................13
4.2.6 MRR-PC ............................................................................................13
5Hardware Installation ......................................................................... 15
5.1 General Provisions ...............................................................................15
5.2 Site Conditions ..................................................................................... 15
5.3 Installation Procedure........................................................................... 16
6Control Program................................................................................. 19
6.1 Installation ............................................................................................ 19
6.2 Limitations using Windows 7 ................................................................ 22
6.3 Using the Control Program ...................................................................23
6.3.1 Main Menu......................................................................................... 24
6.3.2 Control Commands Menu.................................................................. 25
6.3.3 Output Parameters Menu ..................................................................26
6.3.4 Device Parameters Menu ..................................................................28
6.3.5 Parameter Storage ............................................................................30
6.3.6 Status messages ...............................................................................32
6.4 Processed and averaged data..............................................................34
6.4.1 Format description............................................................................. 34
6.4.2 Processed and averaged data example ............................................39
METEK Micro Rain Radar MRR-2 Page 5
2012-03-01 Valid for MRR Service Version 6.0.0.4 / Firmware 6.00
6.5 Raw Spectra ........................................................................................ 42
6.5.1 Format Description............................................................................ 42
6.5.2 Raw Spectra Example....................................................................... 43
6.6 Removing of the Software.................................................................... 44
7Detailed description of the MRR-2 control program ....................... 45
7.1 MRR-Service........................................................................................ 46
7.1.1 Communication ................................................................................. 46
7.1.2 Data Recording ................................................................................. 46
7.1.3 Error Handling................................................................................... 48
7.2 Control Program................................................................................... 49
8MRR-2 Specifications ........................................................................ 52
Page 6 Micro Rain Radar MRR-2 METEK
2012-02-29 Valid for MRR Service Version 6.0.0.3 / Firmware 6.00
1Safety Precautions
To operate the MRR-2 a mains voltage of 210-240 VAC is needed for the
power supply. An improper handling can be dangerous to you. Only
competent and instructed persons should work with this system or with
parts of it.
The outdoor installation must not be performed in case of an
approaching thunderstorm, to avoid a possibly endangering of
personnel by lightning.
There are not known any health hazards originating from the emitted
electromagnetic radiation of about 50 mW. Nevertheless you should
take care that everybody keeps out of the beam above the antenna
(parabolic dish) when it is in operation.
All connecting cables, plugs and couplings of the MRR-2 are not
interchangeable to prevent any erroneous assembly. This safety
precaution is disabled if other types of plugs are installed by the user.
Therefore any guarantee explicitly expires and METEK accepts no
responsibility for injuries to persons, damage of equipment or other
consequences connected with not authorized changing of connectors,
cables or other parts of the system.
Depending on regional rules for the use of electromagnetic transmitters
frequency permission might be necessary. The operator of the system
will be liable for the achievement of such permission. However METEK
will be of help with providing adequate information. Copies of the
certifications for Germany can be found in chapter 8 of this manual.
METEK Micro Rain Radar MRR-2 Page 7
2012-02-29 Valid for MRR Service Version 6.0.0.3 / Firmware 6.00
2How to use this manual
The delivered hardware items are described in chapter 4. Make sure that the
delivery is complete and free of damage. Consult chapter 5 for setting up the
hardware. In chapter 6 the installation and use of the control software is
described. The technical specifications are listed in chapter 8.
Chapter 7 contains more detailed information which is not needed for
standard operation.
All auxiliary information marked by a grey vertical line on the left margin may
be skipped at first reading as it is not needed for standard setting up and
operation.
Page 8 Micro Rain Radar MRR-2 METEK
2012-02-29 Valid for MRR Service Version 6.0.0.3 / Firmware 6.00
3Measuring Principle
The Micro Rain Radar MRR-2 retrieves quantitative rain rates, drop size
distributions, radar reflectivity, fall velocity of hydro meteors and other rain
parameters simultaneously on vertical profiles up to several kilometers above
the radar.
It operates with electromagnetic radiation at a frequency of 24,230 GHz with
a modulation of 0.5 15 MHz according to the height resolution (e.g. 300 m
10 m). The radiation is transmitted vertically into the atmosphere where a
small portion is scattered back to the antenna from rain drops or other forms
of precipitation.
Due to the falling velocity of the rain drops on the antenna there is a
frequency deviation between the transmitted and the received signal
(Doppler frequency). This frequency is a measure for the falling velocity of
the rain drops. Since drops with different diameters have different falling
velocities the backscattered signal consists of a distribution of different
Doppler frequencies. The spectral analysis of the received signal yields a
power spectrum which is spread over a range of frequency lines
corresponding to the Doppler frequencies of the signal.
The RADAR Control and Processing Device (RCPD) determines this power
spectrum with a high time resolution (10 per second) and sends mean power
spectra every 10 s to the connected MRR-PC where the reflectivity spectrum
is calculated considering the calibration parameters of the RADAR module.
Using known relations between fall velocity, rain drop size and scattering
cross section the drop spectrum (or drop size distribution) is derived. The
integration over the entire drop size distribution, considering further
correction terms, followed by further averaging over 10 to 3600 seconds,
results in rain rate and liquid water content.
The output signal of the RADAR is transmitted continuously (CW mode), a
linearly decreasing saw tooth modulation of the transmit signal (FM mode)
makes it possible to perform profile measurements with selectable range
resolution.
The RADAR antenna is an offset parabolic dish with vertical beam
orientation. This antenna design allows rainwater to drain without building
ponds. In order to avoid disturbances from snow which could cover the
antenna dish, optional antenna heating is offered.
METEK Micro Rain Radar MRR-2 Page 9
2012-02-29 Valid for MRR Service Version 6.0.0.3 / Firmware 6.00
4System Description
4.1 Overview
Figure 1: Components of the System
The MRR-PC, a commercial PC, (not part of delivery) must be ordered
separately. The operating system should be Windows® 2000 or XP.
(Windows® Vista and Windows 7 are supported with some limitations).
1- Parabolic Dish
2- Transceiver
3- Antenna Arm
4- Bubble Level
5- RCPD
6- Pivot
7- Tube Socket
8- Junction Box
9- Control Cable
10- Serial Cable
11- Power Cable
Page 10 Micro Rain Radar MRR-2 METEK
2012-02-29 Valid for MRR Service Version 6.0.0.3 / Firmware 6.00
4.2 Description of the Components
4.2.1 Parabolic Dish
The antenna is used for the transmission of the RADAR signals and the
receiving of backscattered signals. It is designed as an offset parabolic dish
(see Figure 1). Its largest diameter is 70 cm, the beam width is 2°. Due to the
offset-design of the parabolic dish rainwater can drain off.
For antenna mounting the tube socket (see Figure 1) (inner Ø = 49.4 mm) is to
be plugged onto a pole with an outer diameter of max. 49 mm. The socket is
fastened with an M10 screw.
Connect a ground wire to this screw which serves as a surge protector.
Check the vertical alignment of the antenna with the built in bubble level.
The transmitting and receiving properties of the antenna affect the radar
calibration. Therefore the reflector surface should be clean (e.g. free from
leaves or wet snow). For the same reason any mechanical deformation of the
parabolic dish must be avoided. If nevertheless obvious deformation occurred,
the reflector must be replaced.
4.2.2 Antenna Heating (Option)
Figure 2: Antenna Heating
1- Parabolic Dish with Heater
2- Heater Connection Box
3- Heater Power Cable
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