Mechanism of imparting illusory doppler frequency characteristic

Details Mechanism of imparting illusory doppler frequency characteristic Mechanism of imparting illusory doppler frequency characteristic

1975-11-05

1982-01-05

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 738

Patent

active

043097049

ABSTRACT:
A false Doppler shift is imparted on a received signal for confusing or dupting the effective functioning of enemy fire control or target tracking signals. A radar repeater having a pair of antennae with associated amplifiers has both antennae visible to a remote radar. A frequency changer is interposed between the antennae for creating a shift in frequency that is to be returned to the enemy. The frequency changer can be either of the mechanical or electronic variety. A mechanical version utilizes a rotary probe driven by a reversible variable speed drive. An electronic version utilizes a sequence of electronic gates controlled by an electronic logic device under the control of a master oscillator.

REFERENCES:
patent: 3039092 (1962-06-01), Rychlik
patent: 3142060 (1964-07-01), Goldmark
patent: 3277476 (1966-10-01), Sabin et al.
patent: 3878525 (1975-04-01), Alpers
patent: 3891989 (1975-06-01), Barney et al.
patent: 3921121 (1975-11-01), Huisveld, Jr. et al.

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