iMet-54 Research Radiosonde
The iMet-54 research radiosonde implements the XData and new high bandwidth XData1 protocols to relay data from 3rd-party sensors (e.g. ECC ozonesondes). XData packets are transmitted together with the standard iMet-54 telemetry data. Reception and processing by the ground system and D-Met software offers a range of output formats for analysis and further processing.
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Radiosonde features:
- Standard radiosonde telemetry and XData packets transmitted at 1Hz
- XData packets may contain up to 316 bytes, or 156 bytes with error correction
- Dynamic application of error correction
- XData packets include an automatically-appended CRC
- Automatic handling of both XData and XData1 protocols
- Plug-in interface lead with standard 3.5mm stereo jack plug
- Internal, environmentally-controlled pressure sensor
D-Met features:
- ECC ozonesonde setup/preparation and data recording utility
- Instrumentation metadata recording together with the sounding data
- Instrumentation daisy-chain handling
- Graphs and reports for data from known scientific instrumentation
- CSV and textual exports of all XData
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System overview
Battery Lithium Primary Operating time > 180 min Dimensions (L x W x H) 235 x 70 x 30 mm Weight 80 grams 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 Thin Polymer Capacitive 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 -90°C to +60°C Resolution 0.01°C Response time (still air) <2 s @ 1000hPa Response time (6 m/s flow) 0.5 s @ 1000hPa 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 Pressure (optional sensor)
Type Piezo-resistive sensor Range 1200 to 10 hPa Accuracy ±0.15hPa Resolution <0.13 hPa Response Time</td > <8.22 milliseconds Telemetry
Transmission type Synthesized Maximum range >250 km Frequency band 400 – 406 MHz Frequency stability ±2 kHz Deviation (peak to peak) 4.8 kHz Output power 200 mW Emission Bandwidth According to EN 302 054 Sideband Radiation According to EN 302 054 Modulation GFSK Data rate 4800 bit/s Frequency selection Wireless or push
buttonPush button frequencies 402, 403, 404, 405 MHz Wireless frequency selection 400 – 406 MHz (10 kHz resolution) Wind
Type GNSS derived Wind Speed Range 0 to 150 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 Range 0 to 50 km Resolution 0.1m Uncertainty 8m Reproducibility 5m -
Product Description Product Code 403Mhz Research radiosonde IMET-54-AR 1680Mhz Research radiosonde IMET-54-BR
