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  Model VT-1 Phased-Array Doppler Sodar System

Model VT-1 Phased-Array Doppler Sodar System

The Model VT-1 sodar developed by Atmospheric Research & Technology (ART) provides a “virtual tower” for obtaining remote measurements of the wind profile up to a maximum height of approximately 300 m (1000 ft).
This self-contained, portable system includes a phased- array acoustic transmitter and receiver with supporting electronics, a notebook computer, and software for system configuration, operation, and data storage. The entire system can be assembled without tools in a matter of minutes.
The unit is designed for both durability and versatility. All cabinet components are stainless steel or PVC plastic. The Model VT-1 is powered by a 12 VDC power supply or battery, drawing only about 40 watts. Thus the unit can be used even at isolated locations lacking support facilities.


•Phased-array antenna for high performance

•Single-frequency operation for simplicity and accuracy

•High-quality construction for durability and dependability

•Simplified design uses Windows® notebook computer for system configuration, operation, and data storage

•Remote site friendly: portable, self-contained, battery-powered, and reliable

•Optional software for calibration and data processing

•Optional hardware for snow melting, external sensors and trailer mounting

•Competitively priced with excellent service & support



Maximum height

300 m (1000 ft)

Minimum height

15 m (50 ft)

Range gates

25 maximum

Effective sampling depth

10 to 40 m (30 to 130 ft)

Transmit frequency

4504 Hz

Pulse duration

10 to 200 ms (adjustable)

Averaging interval

1 to 60 minutes (adjustable)

Wind speed range

0 to 25 m/s (0 to 55 mph)

Wind speed accuracy

±0.25 m/s (±0.55 mph)

Wind direction accuracy

±2 degrees

Power requirement

40 watts (without heater)

Voltage input (nominal)

12 VDC

Weight (w/o batteries)

135 kg (300 lbs.)

Dimensions (w, l, h)

1.5 m (5 ft), 1.8 m (6 ft),

1.5 m (5 ft)


Operation of the Model VT-1 sodar is easy using ART’s PCSodar software to configure and control the Model VT-1 from a familiar Windows® graphical interface. Several wind data display modes are provided, including tabular and plotted profiles for each of the three wind components plus the vector wind speed and direction.

Other screens display spectra of the in- coming signals, graphical representations of the raw input and output signals, an intensity facsimile, and values received from any optional external sensors in use.

Software Options

Data Manager: The SodarTools Data Manager provides a convenient way to manage the large amount of data generated by the Model VT-1. This application reads the daily wind data files created by the VT-1 into a database and provides a variety of tools to view, plot, edit, combine, vali- date, export, and archive the data.

Calibration System: The SodarTools Calibration System (CalSys) includes three modules.

•PulseCheck measures the frequency  of  the sodar transmit pulse.

•MakeTone generates constant  tones  to  test the unit’s frequency response.

•Transpond assesses the accuracy of the sodar timing and signal processing using generated test signals to simulate specific wind conditions.

Both the Data Manager and CalSys run under the Microsoft® Windows® 98SE, 2000, and XP operating systems.

Hardware Options

•Snow-melting system

•Sodar self-test

•Trailer mounting

•External sensors for:

—Wind (anemometer)


—Relative humidity


—Solar radiation


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