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Ultra-Stable 3-Frequency Dual Pol. Radiometer for Rain Sensing

Design of an ultra-stable 3-frequency/dual pol. radiometer for remote sensing of rain. Radiometer versions at 6.925, 10.65, 18.7, and 36.5 GHz. Also includes soil moisture radiometer and rain observation radiometer.

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Ultra-Stable 3-Frequency Dual Pol. Radiometer for Rain Sensing

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  1. Soil Moisture Instrument (BNU Beijing) Design of an Ultra-Stable 3 Frequency / Dual Pol. Radiometer for Remote Sensing of Rain T. Rose (RPG), H. Czekala (RPG), COPS Campaign (Black Forest / Germany)

  2. RPG’s Dual Polarized Radiometer Versions 6.925 / 10.65 / 18.7 / 36.5 GHz Soil Moisture Radiometer 10.65 / 21.0 / 36.5 GHz Rain Observation Radiometer

  3. Rain Observation Radiometer • RPG-6CH-DP • 10.65 GHz: • high rain rates >30 mm/h • 21.00 GHz: • med. rain rates >10 mm/h • 36.5 GHz: • drizzle • Discrimination of cloud liquid and rain liquid water due to polarized emission from rain droplets

  4. Dicke Switch / Noise Injection Calibration System Modular Direct Detection Filterbank Design: • High long term stability due to full auto-calibrating front end • Parallel data aquisition of all channels

  5. Waveguide DDFB Design Full waveguide design guarantees high mechanical stability Receiver Noise Temperature: < 400 K Auto-Calibration Devices: Noise Injection Magnetically switched Dicke SW

  6. Y-Junction Isolator Dicke Switch Design

  7. Y-Junction Isolator Dicke Switch for 90 GHz

  8. RPG Waveguide Dicke Switches

  9. Calibration Timing

  10. Other Receiver Examples • 90 / 150 GHz • full internal cal. • Insertion loss • 90 GHz DS: • 0.7 dB • Insertion Loss • 150 GHz DS: • 1.0 dB • Isolaton >30 dB

  11. Calibration Test of Principle with 21 / 36.5 GHz System 12 Hours

  12. Power Spectrum

  13. Allan Variance up to 4000 Seconds

  14. Thermal Receiver Stability • Hermetically insulated receivers • Thermal Stability <30 mK over full • operating temp. range (-30°C to +45 °C) • Dual stage thermal control system • Peltier stabilized receiver board • Low receiver power consumption < 3 Watts

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