iMet-54 Radiosonde
The iMet-54 is a new-generation radiosonde utilising the latest in sensor technologies. Improved measurement techniques help to overcome previous limitations such as evaporative-cooling of the temperature sensor and humidity sensor icing. The simple, intuitive user interface makes sounding preparations easy. A sophisticated error correction transmission scheme guarantees a reliable data link in the most challenging urban environments.
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- Capacitive thin-film polymer humidity sensor with integrated heater for fast response at low temperature
- Dynamic heating of the humidity sensor prevents saturation or ice formation on the sensor.
- A very small mass glass bead thermistor facilitates extremely fast response to temperature changes. Reflective coating reduces the effects of solar radiation while a hydrophobic polymer counters evaporative cooling events
- SI traceable sensor calibration
- High sensitivity, multi-constellation GNSS receiver with unparalleled accuracy of wind and altitude measurement
- ETSI certified telemetry transmitter provides error free data transmission without interference. Forward-error correcting techniques ensure fault correction for a highly robust telemetry link
- Pre-installed dry lithium battery. Easy-to-use push-button controls power and pre-set transmission frequencies
- User-selectable transmission frequency anywhere within the assigned meteorological frequency band
- No pre-flight recalibration required – all sensors are factory calibrated
- Compact and light weight: 235 x 70 x 30 mm and only 80 grams
- Reduced environmental impact
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System overview
Battery Lithium Operating time > 180 min Dimensions (L x W x H) 235 x 70 x 30 mm Weight 80 g Calibration Stability 2 years Power control Wireless or Push button GPS Receiver
Type GNSS Channels 99 Channels GNNS Systems GPS + GLONASS Cold Start Acquisition Time 35 s (nominal) Reacquisition Time 1 s (nominal) Horizontal Position Accuracy 2.5 m (CEP) Humidity
Type Capacitive Thin Polymer Range 0 % to 100 % RH Resolution 0.01 % RH Response Time 6 m/s, 1000 hPa, +20°C < 0.4 s 6 m/s, 1000 hPa, 0°C < 1 s 6 m/s, 1000 hPa, – 20°C < 3.2 s 6 m/s, 1000 hPa, -40°C < 20 s Repeatability in Calibration 2 % RH Uncertainty 4 % RH Reproducibility 3 % RH Temperature
Type Bead Thermistor Range -100 °C to + 60°C Resolution 0.01 °C Response time (still air @ 1000 hPa) <2 s Response time (6 m/s flow @ 1000 hPa) 0.5 s Repeatability in Calibration 0.1 °C Uncertainty > 100 hPa 0.3 °C Uncertainty < 100 hPa 0.5 °C Reproducibility > 100 hPa 0.1 °C Reproducibility < 100 hPa 0.25 °C Pressure (GNSS derived)
Type GNSS derived Range 1080 to 3 hPa Resolution <0.01 hPa Uncertainty: 1080 – 400 hPa 1 hPa Uncertainty: 400 – 100 hPa 0.4 hPa Uncertainty: 100 – 3 hPa 0.2 hPa Reproducibility: 1080 – 400 hPa 0.6 hPa Reproducibility: 400 – 100 hPa 0.3 hPa Reproducibility: 100 – 3 hPa 0.3 hPa Telemetry
Transmission type Synthesized Maximum range >250 km Frequency band 400.15 – 406 MHz OR
1668.4 – 1690 MHzFrequency stability ±2 kHz Deviation (peak to peak) 4.8 kHz Output power 200 mW Emission Bandwidth According to EN 302 054 for 403MHz model
According to EN 302 454 for 1680MHz modelSideband Radiation According to EN 302 054 for 403MHz model
According to EN 302 454 for 1680MHz modelModulation GFSK Data rate 4800 bit/s Frequency selection Wireless or push button Push button frequencies 402, 403, 404, 405 MHz OR
1676, 1678, 1680, 1682 MHzWireless frequency selection 400 – 406 MHz (10 kHz resolution) OR
1668.4 – 1690MHz (10kHz resolution)Wind
Type GNSS derived Wind Speed Range 0 to 180 m/s Wind Speed Resolution 0.1 m/s Wind Speed Uncertainty 0.15 m/s Wind Speed Reproducibility 0.1 m/s Wind Direction Range 0 to 360° Wind Direction Resolution 0.01° Wind Direction Uncertainty 1° Wind Direction Reproducibility 1° Geopotential Height
Type GNSS derived or optional Piezoresistive Sensor Range 0 to 50 km Resolution 0.1m Uncertainty 8m Reproducibility 5m -
Product Description Product Code 403Mhz Radiosonde IMET-54-AA 403MHz Radiosonde with pressure sensor IMET-54-AB 1680Mhz Radiosonde IMET-54-BA 1680Mhz Radiosonde with pressure sensor IMET-54-BB 1680Mhz RDF Radiosonde IMET-54-BI
