Coherent Techniques for Automatic Direction Finder.
Quarterly progress rept. no. 6, 15 Jan-14 Apr 68,
ELECTRO TECHNICAL ANALYSIS CORP TUCSON AZ
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Analytical work was extended to cover the effects of noise in a linear phase-lock process. The averaged phase detector output was shown to deteriorate from a sawtooth shape toward a sinusoidal shape with increasing noise-to-signal ratio. Corroborative test data were recorded. The construction of an interim pending authorization and development time for a frequency synthesizer substitute oscillator for the receiver with sufficient stability to phase lock on 1f signals with narrow bandwidth was completed successfully. The oscillator is a modified Collins 70E-7A, offset to the frequency of the ANARN-89 local oscillator. Frequency drift was found to be less than 0.1 Hz per second after several minutes warmup. Author
- Direction Finding
- Radio Communications