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Abstract

An improved angle of arrival measurement technique for monopulse antenna systems employing phase shifters on each of the four feeds to resolve ambiguities and to increase the beam splitting (angle of arrival) accuracy. To resolve ambiguities, the phase shifters are employed to shift or steer the sum and difference beams a predetermined angular amount relative to a signal of interest, and the resulting change in the angle of arrival of the returned signal is noted. The position of the original signal, as displayed on an output device, such as a radar display, for example, is then compared with the position of the signal received with respect to the shifted beam. This comparison reveals whether a true signal has been received or not. If the signal of interest is intercepted in the main beam, then the position thereof after the beam has been steered remains in the main lobe of the beam, and hence the signal of interest remains detected. However, if the signal of interest is in the sidelobe, it disappears from the radar display and is not detected.

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First Claim