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RPG - Model HATPRO -Humidity and Temperature Profiling Radiometers
RPG`s profiling radiometers are mainly used to derive vertical profiles of atmospheric temperature and humidity (RPG-HATPRO). The infrared radiometer extension allows to cloud base height and ice cloud detection.The radiometer series covers high-resolution temperature profiling of the boundary layer and low-humidity applications. All models of the series provide accurate total amounts of atmospheric water vapor and cloud liquid cloud. RPG radiometers are stand-alone systems for automated weather-station use under nearly all environmental conditions. A variety of retrieval algorithms (custom designed and global standard algorithms) can be selected.
Applications:
Meteorological observations, Numerical Weather Prediction (NWP), forecasting, now-casting, climate monitoring, aviation meteorology, astronomy, geodesy.
Frequencies:
Two bands, 22-31 GHz (7 channel filter bank humidity profiler and LWP radiometer) and 51-58 GHz (7 channel filter bank temperature profiler)
Retrieved data types:
- vertical profiles of atmospheric temperature
- vertical profile of atmospheric humidty (relative and absolute humidity)
- Liquid Water Path (LWP)
- Integrated Water Vapor (IWV)
- wet delay
- dry delay
- stability indices
This system is very similar to the RPG-LWP liquid water path (two channel) radiometer: Only the receiver systems vary, housing and additional sensors are basically the same.
- Network capability through Ethernet Interface
- Optical resolution: HPBW (frequency dependent): 3.0°-4.2° for water vapor, 1.8°-2.2° for temperature profiler.
- Radiometric resolution: K-Band: 0.10 K RMS, V-Band: 0.15 K (at 1 sec integration time).
- High repetition rate: filter bank receiver produces one atmospheric profile per second
- Absolute system stability: 0.5 K
- Receiver and antenna thermal stabilization: < 0.02 K
- Operating temperature range: –40°C to +45°C
- Automatic rain-mitigation system: hydrophobic coating and strong blower for rain, heater module with 1.8 kW preventing formation of dew and fog condensation on radome
- Integrated PC on-board
- Comprehensive operating software included (free updates)
- Full internal retrieval algorithm, retrieval data and raw data output
- GPS clock and receiver
- Additional external meteorological sensors: barometric pressure, humidity, temperature, wind (direction and speed), rain rate
- IR-radiometer option for cloud base height detection and ice cloud detection
- Azimuth positioner option for full sky scanning (350 samples in less than 6 minutes)
- North-alignment by software feature (sun-tracking plus GPS, only with azimith positioner)
- Fiber-optics data cable to connect radiometer to controlling host PC (maximum length 1600 m)
- Customized retrieval software available
- Stand alone operation
- Data storage and backup on-board, power-failure safe-guard
- Low maintenance (6 months intervall for absolute calibration using LN2)
- Power supply: 100 – 240 V AC (at 47 – 63 Hz)
- Power consumption:
- Weight: 60 kg (without dew blower)
- Dimensions: 63 × 40 × 90 cm (H × W × L, without stand)
- Low cost!
High Precision Boundary Layer Temperature Profiling
- Using only four opaque channels from 55 to 58 GHz
- Noise reduction to less than 0.1 K RMS
- Noise reduction by individual bandwidth per channel (in the saturated line center: 2 GHz)
- Noise reduction by higher integration time (tolerable since all channels detected in parallel)
- Method depends also on small beam width to scan low (close to horizon, 5 degrees elevation)