Details of Grant 

EPSRC Reference:	GR/N66056/01
Title:	PREDICTION TECHNIQUES FOR THE INFLUENCE OF OFF-GREAT CIRCLE PROPAGATION ON HF RADIO SYSTEMS
Principal Investigator:	Warrington, Professor M
Other Investigators:	Jones, Professor T Stocker, Dr A
Researcher Co-Investigators:
Project Partners:
Department:	Engineering
Organisation:	University of Leicester
Scheme:	Standard Research (Pre-FEC)
Starts:	28 March 2001	Ends:	27 April 2004	Value (£):	120,947
EPSRC Research Topic Classifications:	RF & Microwave Technology
EPSRC Industrial Sector Classifications:	Electronics
Related Grants:
Panel History:	Panel Date Panel Name Outcome 20 Jul 2000 Electronics/Electronic Materials Panel Deferred
Summary on Grant Application Form
When ionospheric conditions support off great circle propagation, considerable problems can arise in a number of HF systems. For example, in DF measurements large bearing errors occur resulting in significant errors in the estimates of the location of the transmitter of interest (often many hundreds or even thousands of kilometres). In communications links employing directional antennas, a reduction in received signal strength and SNR occurs since the signals no longer arrive along the direction of the main lobe of the antenna sensitivity pattern. Furthermore, off great circle propagation often supports communications at times which are not predicted (ie when the signal frequency is above the predicted great circle MUF). In OTH radar systems, large positional errors occur.Studies recently undertaken at the University of Leicester indicate that off great circle propagation is due to several propagation mechanisms which are related to the prevailing geophysical conditions. These mechanisms are not included in the various propagation prediction codes which are currently available and consequently cannot readily be taken into account by system designers and operators. The purpose of this investigation is to develop new propagation prediction tools to enable these effects to be fully taken into account.
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Organisation Website:	http://www.le.ac.uk