The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 07, 1987
Filed:
Jul. 24, 1985
George I Tsuda, Fullerton, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
A single channel antenna tracking system for frequency-hopping communication systems. The tracking system utilizes the synchronization pulses accompanying the frequency-hopping data bursts. The receive antenna system includes an antenna feed network for providing sum and difference antenna receive signals. The tracking system comprises a tracking switch circuit which normally switches the antenna system sum signal to the receiver during reception of a frequency-hopping data burst. During the reception of an agile synchronization pulse, however, the switching system is adapted to timeshare between the antenna sum signal and the difference signal or signals. During the synchronization pulse duration, the receiver thus receives a single waveform which during one portion of the sync pulse represents the sum signal and during one or two other portions represents the difference signals. The respective sum and difference signals may then be processed to determine the antenna tracking error. Only one channel is required for both the sum and difference signals, thereby minimizing the cost of the tracking system.