Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1959-05-19
1976-02-10
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 14, G01S 924, F42C 1304
Patent
active
039381471
ABSTRACT:
4. A single antenna missile fuzing system adapted to function at a predetined distance from a target, said system comprising in combination: a microwave oscillator, a frequency modulator for modulating said oscillator at a frequency which is considerably lower than the doppler frequency occurring when the missile is falling at terminal velocity, a magic tee having first and second side arms, an H-arm and an E-arm, the output of said microwave oscillator being fed to said H-arm, an antenna connected to said first side arm and adapted to radiate energy towards a target and receive energy reflected therefrom, a load connected to said second side arm, a crystal detector disposed in said E-arm, said load being chosen so that only a relatively small portion of the energy from said microwave oscillator passes to said crystal detector to mix with the received energy passing to said detector from said first side arm, the output of said detector comprising a frequency modulated wave having a carrier frequency equal to the doppler frequency and sidebands equal, respectively, to the sum and differences of said carrier frequency and said modulation frequency and its harmonics, said frequency modulated wave having a frequency deviation which is dependent upon target distance, an amplifier to which said detected signal is fed, said amplifier being tuned to the doppler frequency and having a bandwidth which is equal to at least twice said modulation frequency, a limiter to which the output of said amplifier is fed for producing an essentially constant amplitude signal, a frequency discriminator to which the output of said limiter is fed, said discriminator producing an output voltage which is substantially proportional to target distance, and means connected to the output of said discriminator for functioning said fuze when the output of said discriminator is a predetermined value corresponding to said predetermined distance.
REFERENCES:
patent: 2612636 (1952-09-01), Rust et al.
patent: 2842764 (1958-07-01), Harvey
patent: 3076191 (1963-01-01), Williams
patent: 3189899 (1965-06-01), Slater
patent: 3829859 (1974-08-01), Kalmus et al.
Edelberg Nathan
Elbaum Saul
Gibson Robert P.
The United States of America as represented by the Secretary of
Tubbesing T. H.
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