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Specifications for the 3 Doppler SODAR models :
- PCS2000-16
- PCS2000-24
- PCS2000-64
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SODAR
Characteristics
Measuring ranges
Parameters
Accuracies
SODAR home
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Dimensions of the largest SODAR PCS2000-64 SODAR and typical RASS
antenna
(the RASS antenna may vary depending on type) |
Please note that all specifications on this page are subject to change.
E.& O.E
Special characteristics of the range of PCS2000 SODARs
- µ-Processor-controlled data sampling and data evaluation
- high volume ranging ( > 96 dB) due to low noise amplifiers
- high transmit power ( > 800 W1 electrical power), providing high data availability
even in case of unfavourable site conditions
- spectral analysis by software algorithm (DFT) providing an accurate determination of
measured data and height range; no need of filter adjustment
- 3 network ports, selectable output of different data sets for each port
- parameter storage for several sets of operation parameters
- optimisation of transmit pulse length and spectral resolution according to selected
height resolution
- transmit frequency adjustable for optimised operation performance at sites with noisy
frequency bands
- automatic matching (selectable) of transmit power according to signal quality in a
selectable height range, providing low annoyance of environment by system operation
- reliable plausibility check of all measured values reported in data sets
- easy to use system operation
- unattended system operation by automatic restart capability after power failure
An overview of the measuring ranges
| Measuring Ranges |
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| wind velocity |
0 - 35 m/s |
| wind direction |
0 - 360° |
| standard deviation radial wind components |
0 - 3 m/s |
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| Measuring Accuracy |
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| wind velocity (0 - 5 m/s) |
± 0.5 m/s |
| wind velocity (5 - 35 m/s |
± 10% |
| wind direction (0.8 - 35 m/s) |
± 5° |
| radial wind components |
± 0.1 m/s |
| standard deviation radial wind components |
± 0.15 m/s |
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| Measuring Heights |
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| lowest measuring height (adjustable depending on height
resolution) |
10 m |
| height resolution (adjustable) |
5 - 50 |
| data availability (depending on site conditions and system
parameter) |
80% up to 200 m |
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| Transmit Frequency |
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| acoustic: adjustable |
1.5 - 3 kHz |
| electromagnetic (optional/RASS) |
1290 MHz |
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| Power Consumption |
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| PC with interface |
230 V, 250W |
| power supply unit |
230 V, 130 W7 |
| RASS electronic unit (optional) |
230 V, 350 W |
| low power version PCS-2000/24 LP |
230 V, 90 W |
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| Data Transfer |
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| network connector |
10/100 Mbit/s, Ethernet |
For other model specific system specifications, accuracies, operational
parameters and measuring variables please see the tables below.
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Parameter Table
| Parameters for: |
PCS2000-16 |
PCS2000-24 |
PCS2000-64 |
| Frequency |
1800 ... 2900 Hz
2000 ... 2600 Hz recommended |
1500 ... 2600 Hz
2000 ... 2200 Hz recommended |
As PCS2000-24 |
| Horizontal wind comp. |
+- 30 m/s |
+- 50 m/s |
As PCS2000-24 |
| Wind direction |
0 - 360 degree |
As PCS2000-16 |
As PCS2000-16 |
| Vertical wind speed |
> +- 5 m/s |
> +- 10 m/s |
As PCS2000-24 |
| Operating temperature |
- 30 ° C to + 55 ° C (outdoor) + 5 ° C to +
45 ° C (indoor) |
As PCS2000-16 |
As PCS2000-16 |
| Operating humidity |
5-100 % (outdoor)
10-95 % (indoor) |
As PCS2000-16 |
As PCS2000-16 |
| Integration time |
Typical 600-1800 s, minimum 10 seconds for a
complete cycle of all three antenna beams; instantaneous mode for evaluation of individual
signal pulses is available simultaneously to the averaging mode
For wind speed and wind direction, and standard
deviations of u-, v-, w-component an averaging period of at least 10 minutes or more
is recommended in order to comply with the fundamental assumption of SODAR operation which
demands homogenous flow properties in the measuring volumes of the different antenna
beams. |
As PCS2000-16 |
As PCS2000-16 |
| Number of gates |
adjustable
1- 40 (more on request) |
As PCS2000-16 |
As PCS2000-16 |
| Minimum measuring height |
adjustable
≥20 m
increment ≥ 5m |
adjustable
≥ 15 m
increment ≥ 5m |
As PCS2000-24 |
| Height resolution |
adjustable
10 m ≤ ΔH ≤100 m
increments ≥ 5m, typical 10 - 30 m; |
adjustable, 5 m ≤ ΔH ≤100 m increments
as PCS2000-16 |
As PCS2000-24 |
| Measuring height |
depends strongly on atmospheric and site conditions, we define: 300
m, 70 % availability (for wind speed and direction, ΔH=30 m, 900 s, 55 dB
noise level, cluster algorithm for data evaluation of instantaneous data); |
As PCS2000-16 |
As PCS2000-16 except
500 m, 70 % availability |
| Maximum measuring height |
nominal > 500 m, only in very favourable conditions, 900s, 9
frequencies |
nominal >1000 m, only in very favourable conditions |
nominal >1500 m, only in very favourable conditions |
| Signal power |
is automatically adjusted.
Max. 160 Wp (elect.) |
automatically adjusted.
Max. 480 Wp (elect.) |
automatically adjusted.
Max. 1000 Wp (elect.) |
| Antenna gain |
typ. 14 dB, dependent on frequency |
typ. 20 dB, dependent on frequency |
As PCS2000-24 |
| Sensitivity of receiver |
10-6 N/m², depends on frequency |
As PCS2000-16 |
As PCS2000-16 |
| Beam width |
typical 7 -12 °, depends on frequency |
As PCS2000-16 |
As PCS2000-16 |
| Qualifying |
German Nuclear Power guideline KTA1508 / VDI guide line DIN 3786
(11) |
As PCS2000-16 |
As PCS2000-16 |
| Power consumption |
depends on operation, approx. 150 W avg. |
As PCS2000-16 |
depends on operation, approx. 500 W avg |
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Accuracies
In principle the numerical accuracies depend on some operational parameters (frequency,
height resolution). The values are given for recommended settings:
| Accuracies for: |
PCS2000-16 |
PCS2000-24 |
PCS2000-64 |
| Horizontal wind comp |
0.3 m/s, or 5 % |
0.4 m/s, or 5 % |
0.1 - 0.3 m/s, or 5 % |
| Wind direction |
3° for wind speeds over 3 m/s 3-5° for wind
speeds to 3 m/s |
3-5° for wind speeds over 5 m/s 5-8° for wind
speeds to 5 m/s |
1-3° for wind speeds over 5 m/s 3-5° for wind
speeds to 5 m/s |
| Vertical wind component |
0.1 m/s, or 5 % |
As PCS2000-16 |
0.03 - 0.1 m/s, or 5 % |
| Std. dev. of vert. wind comp |
0.1 m/s, or 5 % |
As PCS2000-16 |
0.10 m/s, or 5 % |
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Operational Parameters Applies to all SODAR Models
| Date, Time, Time zone |
adjustable |
| Number of measuring heights |
adjustable |
| Lowest measuring height |
adjustable |
| Maximum measuring height |
adjustable |
| Height resolution |
adjustable |
| Averaging interval |
adjustable, and/ or instantaneous mode |
| Transmit frequency (determines zenith angle) |
adjustable |
| Zenith angle (determines transmit frequency) |
adjustable |
| Antenna orientation, azimuth |
adjustable, 0 ... 359 ° |
| Antenna orientation, zenith |
adjustable, 10 ... 25 ° |
| Type of data protocols |
adjustable |
| Output |
asynch., sync., external demand |
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Measuring Variables Applies to all SODAR Models
The Doppler SODAR subsystem offers a variety of on-line computed measuring variables on
three independent serial output ports and/or via Ethernet (Option) with adjustable secured
transfer protocols and adjustable port specifications (baud rate, character size, ...).
All adjustments are made by software commands.
In addition to the average mode a single pulse evaluation and a consensus method
(cluster) can be performed. The PCS2000 offers following on-line computed measuring
variables on serial output ports and/or via Ethernet (Option) with adjustable secured
transfer protocols and adjustable port specifications (baud rate, character size, ...):
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Averaged Variables |
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| Variable |
Variable Type |
Unit |
| H |
Measuring heights |
m |
| Fni |
Spectra |
dB |
| P i |
Signal intensity |
dB |
| R i |
Reflectivity |
dB |
| VRi |
Radial wind components |
m/s |
| Wc |
Vector wind speed |
m/s |
| V |
Wind speed |
m/s |
| D |
Wind direction |
degree |
| VS |
Scalar wind speed |
m/s |
| DS |
Scalar wind direction |
degree |
| S i |
Sigma of radial wind components |
m/s |
| S c |
Sigma of horizontal components |
m/s |
| SD |
Sigma of vertical wind direction |
degree |
| ST |
Sigma of horizontal wind direction |
degree |
| DC |
Stability class (diffusion) |
A-F |
| MH* |
Mixing height |
m |
| SNi |
Signal/Noise ratio |
[ ] |
| Dai |
Sample availability |
% |
| ERi |
Plausibility tests |
8888 |
| CT* |
Temperature structure parameter |
°K^2/m^2/3 |
Notes on Measuring Variables:
Read the index i as antenna beams 1,2,3, having "beam 3" vertical.
Read the index n as FFT-Lines n=1..32.
Read the index c as orthogonal vector components u,v,w, having component "w"
vertical
Pls. note: MH* is identified either in the reflectivity profile (ex.: identification of
elevated inversions) or the on-line derived stability class is used.
Pls. note: For a quantitative CT calculation the unknown vertical humidity and
temperature profiles are required. We do not recommend to estimate this parameter from
SODAR, however we will implement such routine on the users expertise without extra costs.
We recommend to extend the SODAR installation with an ultrasonic sensor such as the Wind Research 400 with on-line computation of all turbulent
quantities used for absolute calibration of the atmospheric reflectivity and as a
redundant tool for dispersion parameter measurements.
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Thank you for taking the time to read this page |
