Details of Grant 

EPSRC Reference:	GR/R37517/01
Title:	Wideband HF and UHF Simulators for Ionospherically Reflected/Transionospheric Channels
Principal Investigator:	Strangeways, Dr H
Other Investigators:	Darnell, Professor M
Researcher Co-Investigators:
Project Partners:
Department:	Electronic and Electrical Engineering
Organisation:	University of Leeds
Scheme:	Standard Research (Pre-FEC)
Starts:	01 August 2001	Ends:	30 November 2002	Value (£):	119,789
EPSRC Research Topic Classifications:	RF & Microwave Technology
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine Communications
Related Grants:
Panel History:
Summary on Grant Application Form
Two channel simulators will be constructed, one for wideband HF multipath ionospherically reflected transmissions and one for transionopsheric propagation for GPS frequencies and bandwidths. Both simulators will be based on the theory of propagation In a time-fluctuating irregular ionosphere, developed by Prof. Zernov and Dr. Gherm and based on the generalised Rytov's approximation. The HF simulator will generate a data output giving a time realisation of the statistical moments of the electric field amplitude and phase resulting from multipath propagation through the HF wideband channel for any given transmitter receiver path for any time of day, day, month and year for any solar activity/geomagnetic conditions. The input parameters (e.g. received field amplitude, Doppler shift and Doppler spread ) required for each propagation paths e.g. 1 E. 1 hop F2, 2 hop F2 etc .will be capable of determination by the physical model itself rather than each being input as somewhat arbitrary and uncorrelated emprically chosen parameters. The simulator will enable testing of candidate HF modem schemes for various applications, e.g. HF broadcasting (DRM) and spread spectrum systems; both direct sequence and frequency hopping. A similar simulator will be constructed for GPS frequencies and bandwidths for midlatitude and equatorial paths for both precision and civilian codes. This will enable the effect of scintillations on GPS navigation systems to be modelled.
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Organisation Website:	http://www.leeds.ac.uk