Title: Radio frequency signal direction finding systems

Abstract: A radio frequency signal direction finding system including a multi-beam antenna having a plurality of feed ports, each one of such feed ports receiving energy from the received signals, the levels of such energy being associated with the angles of arrival of such received signals. A plurality of high pass filters or differentiator circuits are coupled to the feed ports for producing output signals related to the changes in levels of the energy received at the feed ports. The output signals are used to determine the angles of arrival of the received signal. Because the angle of arrival of a received signal is determined by output signals representative of the changes in level of the signals received at the feed ports, the angle of arrival of a weaker received signal may be determined even if such weaker signal is received during a time period when a first, stronger, ongoing signal is being received from a different direction.

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Inventors: Krilanovich, Nicholas J. (Santa Barbara, CA, US)

Application Number: 966172
Filing Date: 1978-12-04
Publication_date: 1980-10-21
Assignee: Raytheon Company (Lexington, MA)
Primary Class(es): 342/445 343/853
Other Classes:
US Patent Ref:

3911442	Oct, 1975	Hatch	343/854.
3979754	Sep, 1976	Archer	343/854.

Other Refs:
Primary Examiner: Lieberman, Eli
Assistant Examiner:
Attorney: Sharkansky; Richard M., Pannone; Joseph D.