Tacan-dme identity detector

Details Tacan-dme identity detector Tacan-dme identity detector

1975-08-14

1977-06-28

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92MS, 235 92PE, 235 92R, 343106R, G01S 144, H03K 2136

Patent

active

040327566

ABSTRACT:
This relates to a method and apparatus for extracting identity information from a Tacan signal which occurs during a 5 second interval every 37.5 seconds. The identity information consists of marks and spaces wherein a mark comprises a predetermined number of adjacent group reference signals, each having therebetween a plurality of regularly spaced Tacan pulse pairs. The Tacan signal is sampled at regular intervals following each group reference signals by means of a gating arrangement. A first counter counts the number of coincidences between pulse pairs and gates generated by the gating arrangement. A second counter counts the total number of gates generated and when the ratio of the number of coincidences to the total number of gates reaches a preset threshold, a mark counter is incremented. When the ratio of the contents of the mark counter to the total number of group reference signals reaches a preset value, a mark is declared. If a preset number of intervals between group reference signals occur which do not meet the requirements of a mark, a space is declared.

REFERENCES:
patent: 3272970 (1966-09-01), Laycak et al.
patent: 3332080 (1967-07-01), Verwey
patent: 3473130 (1969-10-01), Briggs
patent: 3824378 (1974-07-01), Johnson et al.

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