COHERENT TECHNIQUES FOR AUTOMATIC DIRECTION FINDER.
Quarterly progress rept. no. 4, 15 Jul-14 Oct 67,
ELECTRO TECHNICAL ANALYSIS CORP TUCSON AZ
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A functional design was formulated for modification of the ANARN-89 ADF set for coherent operation. In this modification, improvements over the ANARN-83 modification include improved acquisition and phase-lock circuitry filtering techniques to reject received modulation at the ADF switching frequency, and carrier positive-identification techniques in transmission and reception. Measurements of the ANARN-89 PEDM receiver showed that specifications were not met by this apparatus. Since extensive changes will be made in the EDM model, detailed measurements were postponed. Theoretical studies were conducted of analog, linlock, and derived-rate rejection phase lock. A construction program was begun of phase lock circuitry for empirical investigation of the principles theoretically investigated, in the presence of noise and interfering signals. Author
- Direction Finding