Charles L Wrench RCRU Status of Observations at Chilbolton (CFARR) October 2004.

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Presentation transcript:

Charles L Wrench RCRU Status of Observations at Chilbolton (CFARR) October 2004

Presenter Name Facility Name Millimetre cloud radars at CFARR 94 GHz radar in cradle and 35 GHz radar on mount

Presenter Name Facility Name Status of millimetre wave cloud radars: 94 GHz Galileo radar has been experiencing loss of transmitter power and apart from a few days of operation it has been switched-off since 9 th April Recent malfunction of the receiver is currently under investigation. 35 GHz Copernicus radar has been operating since early May The radar has two modes of operation: transmitting (1) coded and (2) uncoded pulses. By adopting the pulse compression mode it is possible to improve sensitivity by ~10dB. The radar measures: Full Doppler spectrum, the spectral moments and the polarimetric parameters

Presenter Name Facility Name Specification of 35 GHz Copernicus radar: Transmitter is based on a programmable waveform generator driving a high-power pulsed amplifier tube (EIKA). The receiver is a dual channel, double-conversion superheterodyne with separate IF chains for simultaneous co-polar and cross-polar measurements. Dual-polarisation antenna (2.4 m) includes a fast transmit polarisation switch. Tx power 1.5 kW peak pulse Range resolution 75 metres Beamwidth0.23 degrees PRF5000 Hz Unambiguous velocity~5.3 m/s Minimum range in pulse compression mode~500 metres

Presenter Name Facility Name Uncoded pulse Coded pulse [Pulse Compression Gain ~10dB] 35 GHz Copernicus radar data radar reflectivity velocity away from radar

Presenter Name Facility Name Uncoded pulse Coded pulse [Pulse Compression Gain ~10dB] 35 GHz Copernicus radar data radar reflectivity velocity away from radar

Presenter Name Facility Name UV Raman Lidar IR Lidar CT75K Ceilometer collects backscatter Lidars Radiosonde comparisons with integrated water vapour profile performed during July 2004

Presenter Name Facility Name Pyrgeometer & Pyranometer Broadband Radiometers Radiometers Microwave radiometers Retrieving LWP and IWV From 22.2 and 28.8 GHz [37.5 GHz under investigation for instability]

Presenter Name Facility Name Additional measurements: One month of data. Comparison of performance between pulsed radar and low power FMCW unit (100mw Tx power) Two examples: FMCW - low power radar

Presenter Name Facility Name Non-Precipitating Cloud

Presenter Name Facility Name Precipitating Cloud