LIDAR RESEARCHER: Ms Judith L Agnew
RESEARCH ASSOCIATES: Mr A J Gibson, Mr K J Twort
MAILING ADDRESS:
CLRC Rutherford Appleton Laboratory
Chilton
Didcot
OX11 0QX
UK
TELEPHONE NUMBER: +44 1235 821900
FAX NUMBER: +44 1235 446140
E-MAIL ADDRESS: j.l.agnew@rl.ac.uk
WEB SITE: http://www.rcru.rl.ac.uk
DATE: 28/08/01
LIDAR LOCATION (CITY, COUNTRY, LAT., LONG.):
Chilbolton Observatory, UK, lat. +51°, long. -1.8°W
SITE ELEVATION: 80m
PARAMETER(S) OR CONSTITUENT(S) MEASURED: Elastic scattering,
temperature, water vapour
RESEARCH OBJECTIVES AND SPONSOR: Radio refractive index (dependent
on temperature and water vapour content), currently sponsored
by Radiocommunications Agency in the UK.
MEASUREMENT TECHNIQUE: Raman lidar
MEASUREMENT RANGE: Approx. 12km
VERTICAL RESOLUTION: Minimum of 6m
FREQ. OF MEASUREMENT (TYPICALLY): Minimum of 10s
MEASUREMENT TIMES (TYPICALLY): Few hours
LASER TYPE AND WAVELENGTH (s): Nd:YAG, 355 nm
LASER ENERGY/PULSE: 0.3 J per pulse
PULSE REPETITION RATE: 50Hz
RECEIVER SIZE AND CONFIGURATION: 0.45m diameter, coaxial, vertically
pointing
DETECTORS USED: Photomultiplier tubes
SIGNAL PROCESSING: Analog
ANALOG-T0-DIGITAL CONVERTER: Data acquisition cards
COMPUTER: 3 PCs
PLATFORM (if applicable):
PUBLICATIONS (5 recent and/or significant):
J. L. Agnew and K. J. Twort "A Raman Backscattering Lidar
System for Radio Refractivity Determination", Proceedings
of URSI Commission F Meeting on Climatic Parameters in Radiowave
Propagation Prediction (CLIMPARA 2001), ESA WPP-184 pp. 63-67
(2001)
J. L. Agnew, A. Gibson and A. Marsh "Determination of Radio
Refractivity at Altitudes up to 2 km using UV Lidar", Millennium
Conference on Antennas and Propagation, ESA SP-444 (2000)
COMMENTS: The Raman scattering capabilities of this system are
currently under development. The aim is to be able to make both
water vapour and temperature measurements by day, up to relatively
low altitudes (approx. 2km), as well as by night.
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