Pulse stream identification circuit

Details Pulse stream identification circuit Pulse stream identification circuit

1975-11-10

1977-08-09

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 18E, 343 171R, 343106R, G01S 902

Patent

active

040414868

ABSTRACT:
An aircraft DME is receptive of a series of pulses the nature of which alternates between a series of random time spaced pulses and a series of uniform time spaced pulses, where the latter serve to identify the source of the pulses. A set-reset type of counter triggered by the decoded series of random pulses or by the decoded series of uniform time spaced pulses is thereafter continually advanced to a known count producing a gate signal which searches and locks onto the decoded series of uniform time spaced pulses by repeating the process. After a preselected number of repeats corresponding to successive uniformly spaced pulses, audio signals are produced so long as the uniform spaced pulses continue.

REFERENCES:
patent: 3889260 (1975-06-01), Griffin
patent: 3976999 (1976-08-01), Moore et al.

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