Vaisala AVAPS
Vaisala AVAPS
Vaisala AVAPS
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<strong>Vaisala</strong> <strong>AVAPS</strong>Dropsonde Receiving SystemThe complete solution for accurate, targetedin-situ measurement of the atmosphere
The Ultimate in In-Situ Measurement of theAtmosphere.The <strong>Vaisala</strong> <strong>AVAPS</strong> MD11and <strong>Vaisala</strong> DropsondeRD93 represent the latestin dropsoundingtechnology with anonboard dropsondemicroprocessor andsynthesized digitaltransmission. Thiscombination offers themeteorologicalcommunity a completesolution for accurate insitumeasurement of theatmosphere.<strong>AVAPS</strong> stands for "Airborne VerticalAtmosphere Profiling System", amulti-channel GPS dropsoundingsystem that was developed by NCARand introduced in 1997 for hurricaneresearch and reconnaissance. The<strong>Vaisala</strong> Dropsonde RD93 is used withthe <strong>Vaisala</strong> <strong>AVAPS</strong> DropsondeReceiving System. Both products arelicensed by NCAR and have beenused on many missions in support ofoperational weather forecasting andatmospheric research.The <strong>Vaisala</strong> <strong>AVAPS</strong>The <strong>Vaisala</strong> Dropsonde RD93measures and transmits pressure,temperature, relative humidity andwind data to the <strong>AVAPS</strong> receivingsystem at a high data rate. The <strong>AVAPS</strong>processes the data, displays it andstores it to the hard disk.The <strong>AVAPS</strong> system comprises:• A dropsonde launcherand control unit• UHF antenna for receivingdropsonde data and GPS antennafor receiving reference GPS data• A dropsonde telemetry chassis• A serial RS-232 interfacebetween the PC and thedropsonde telemetry chassis andother aircraft systems• A fan panel for cooling thedropsonde telemetry chassis• A PC with keyboard/mouse forprocessing and storing dataInstallation frame(optional)LCD flat paneldisplayKeyboard andtrackball mouseFan panel• Easy-to-use software for settingdropsonde parameters andreceiving data• A color monitor with screens forset-up, operation & data display• An optional printerIn the dropsonde telemetry chassis,each channel (up to 4) contains a GPSprocessor, a PTU buffer board and a400 MHz receiver. A dropsondeinterface card is used for checking thedropsondes and setting the telemetrytransmitter frequency before launch.A launcher is provided for safeejection from the cabin.The <strong>Vaisala</strong> <strong>AVAPS</strong> systemcomponents can be installed in astandard 19'' equipment rack withconnections to mains power, the UHFantenna and the GPS antenna.External aircraft data systems can beinterfaced through a RS-232 serial link.The <strong>Vaisala</strong> <strong>AVAPS</strong> is a generalpurposedropsonde receiving system,versatile enough for use in manydifferent kinds of aircraft. Employingthe <strong>Vaisala</strong> Dropsonde RD93 for windand PTU measurements, the <strong>AVAPS</strong>system architecture handles up to fourdropsondes descendingsimultaneously.<strong>Vaisala</strong> <strong>AVAPS</strong>telemetry chassisRack-mounted PCPrinter (optional)Vibration suppressionsystem (optional)
Main system features<strong>Vaisala</strong> <strong>AVAPS</strong> main features:• Operates to an altitude of 24 km• Operates in both polar andtropical environments• Operated by one person• Four-channel data system allowsdense horizontal dropsondespacing<strong>Vaisala</strong> Dropsonde RD93 mainfeatures:• Can be deployed at indicatedairspeeds up to 250 knots• Descent time: approx. 15 minfrom 14 km, 8 min from 7.5 km• 2 Hz sample rate for wind andthermodynamic data• Preparation time
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