Upper-air measurement
iMet-54Research Radiosonde
Standard radiosonde measurements with an external data interface for intelligent sensors and research equipment, including ECC ozonesondes.
316 bytes
Maximum XData capacity
156 bytes
With error correction
1 Hz
Telemetry and XData transmission
XData + XData1
Automatic protocol handling
01 / Technology
Key features
Research data is packaged with standard iMet-54 telemetry and transmitted to the ground receiver every second. Extended XData1 supports individual packets larger than 256 bytes.
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
- Field replaceable batteries for repeat flights
- Compatible with NOAA/GMD SkySonde software
D-Met features
Ground-system reception and D-Met processing provide output formats for research data analysis and further processing.
- 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
02 / Technical data
Specifications
Sensor performance, system characteristics and telemetry specifications.
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, BDS, Galileo, QZSS |
| Cold Start Acquisition Time | 35 s (nominal) |
| Reacquisition Time | 1 s (nominal) |
| Horizontal Position Accuracy | 1.5 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 | 1100 to 3 hPa |
| Resolution | <0.01 hPa |
| Uncertainty: 1100 – 400 hPa | < 1 hPa |
| Uncertainty: 400 – 100 hPa | < 0.4 hPa |
| Uncertainty: 100 – 3 hPa | < 0.2 hPa |
| Reproducibility: 1100 – 400 hPa | < 0.6 hPa |
| Reproducibility: 400 – 100 hPa | < 0.3 hPa |
| Reproducibility: 100 – 3 hPa | < 0.2 hPa |
Telemetry
| Transmission type | Synthesized |
| Maximum range | >250 km |
| Frequency band | 400.15 – 406 MHz OR 1668.4 – 1690 MHz |
| Frequency 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 model |
| Sideband Radiation | According to EN 302 054 for 403MHz model According to EN 302 454 for 1680MHz model |
| Modulation | 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 MHz |
| Wireless 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 |
03 / Product options
Ordering information
403 MHz and 1680 MHz research configurations, including the listed XData and XData1 variant.
| Product description | Product code |
|---|---|
| 403Mhz Research radiosonde | IMET-54-AR |
| 403Mhz Research radiosonde with XData and XData1 protocols | IMET-54-AS |
| 1680Mhz Research radiosonde | IMET-54-BR |
04 / Resources
Product documents
Brochures and product information direct from InterMet.
