Mohammed Ali Hussain

US Patent:

40414868, Aug 9, 1977

Filed:

Nov 10, 1975

Appl. No.:

5/630730

Inventors:

Mohammed Imam Hussain - Los Angeles CA

Assignee:

RCA Corporation - New York NY

International Classification:

G01S 902

US Classification:

343 73

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.