Accession Number:

AD0256752

Title:

STUDY OF OPTIMIZATION OF AIRBORNE DIRECTION FINDING SYSTEMS IN THE VHF-UHF FREQUENCY RANGES

Descriptive Note:

Corporate Author:

GRANGER ASSOCIATES PALO ALTO CALIF

Personal Author(s):

Report Date:

1961-05-01

Pagination or Media Count:

1.0

Abstract:

A new method for reducing the bearing errors associated with present day VHF-UHF airborne direction finding systems was studied. The method is essentially that of incorporating an ideal detector into the receiver section of a DF system. Initially the problem was treated as one in communication theory by considering the pattern distortions as additive random noise. Alternate approaches investigated included use of the information contained in recorded DF patterns to optimize the detector. A formal solution employing this approach was obtained but to obtain numerical answers would have involved computer programming difficulties beyond the scope of this study. Analysis of available DF patterns showed that operating on a single harmonic of a DF pattern instead of the entire pattern resulted in increased bearing accuracy. The instrumentation necessary to determine bearing from a single harmonic is relatively simple. A number of the tech iques investigated may provide bearing error reduction. The si gle harmonic technique shows the greatest promise. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE