iMet-54 Research Radiosonde
The iMet-54 research radiosonde offers all of the features of standard radiosondes, with the added feature of implementing the XData and extended XData1 protocols, for the relaying of third-party sensor data. The XData connection and protocols allow data to be collected, by the iMet-54, from connected intelligent sensors and research equipment (e.g. ECC ozonesondes). This data is then packaged together with the standard iMet-54 telemetry data, and transmitted to the ground receiver system every second.
The iMet54 research radiosonde offers a XData capacity of up to 316 bytes, which is over 6 times higher than current typical industry offerings (50 bytes). To capitalise on this larger data capacity, the iMet-54 also implements the new XData1 protocol. This permits individual packet sizes in excess of 256 bytes from attached instrumentation.
Reception and processing by the ground system and D-Met software offers a range of output formats for analysis and further processing of the research data.
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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 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 (optional sensor)
Type Piezo-resistive sensor Range 1200 to 10 hPa Accuracy ±0.15hPa Resolution <0.13 hPa Response Time <8.22 milliseconds 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 Research radiosonde IMET-54-AR 1680Mhz Research radiosonde IMET-54-BR
