| definition |
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ER-2 Height Altitude Dropsonde System (EHAD) use dropwinsonde
fitted with Global Positioning System (GPS) receivers to measure
the atmospheric state parameters (temperature, humidity, wind
speed/direction pressure) and location in 3 dimensional space
during the sonde's descent once each half second. Measurements
are transmitted to the aircraft from the time of release until
impact with the ocean's surface.
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