PREDICTED PERFORMANCE OF A SYMMETRICAL-PAIR DIRECTION FINDING SYSTEM IN LOW SIGNAL-TO-NOISE ENVIRONMENTS

The detection probability of an antenna pair of a symmetric-pair direc tion finding (DF) system in the presence of Gaussian noise is investig ated. The question of system sensitivity as a function of the signal's angle of arrival is addressed. Expressions for false-alarm rate and p robability of detection of a single Symmetric-pair for different width s of the intermediate zone, a symmetric-pair specific parameter, are d erived. It is shown that the width of the intermediate zones hardly af fects the peak sensitivity but has an effect on the probability of det ection for certain angles of arrival. A technique that yields hardly c hanging detection probability of the DF system for constant threshold and varying signal and noise levels is discussed.