James R Small

US Patent:

51466163, Sep 8, 1992

Filed:

Jun 27, 1991

Appl. No.:

7/722621

Inventors:

Raymond Tang - Fullerton CA
James G. Small - Westlake Village CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H04B 700
G01S 7282

US Classification:

455103

Abstract:

A predetermined radar pulse train is formed in space by transmitting individual spectral components thereof. Thus, a train of extremely short pulses is obtained without switching a radio frequency signal on and off at a high rate. A crystal oscillator is coupled to a harmonic generator such as a comb generator. A power divider distributes the output of the harmonic generator to a multiplicity of final filter amplifiers. Each final filter amplifier has a phase-locked VCO circuit that provides frequency accuracy, spectral purity, low noise and frequency stability. Thus, each final filter amplifier provides one of the spectral components of the predetermined radar pulse train. The final filter amplifiers are coupled by duplexers to a broadband multiplexing feed such as a nested cup dipole feed that illuminates a reflector. On receive, the broadband multiplexing feed separates all the spectral components of the incoming pulse train. Each spectral component is coupled to its own narrow band receiver by the duplexers.

US Patent:

52393097, Aug 24, 1993

Filed:

Jun 27, 1991

Appl. No.:

7/722769

Inventors:

Raymond Tang - Fullerton CA
James G. Small - Westlake Village CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

G01S 728

US Classification:

342 13

Abstract:

An impulse radar that forms a predetermined radar pulse train in space by transmitting individual spectral components thereof. Thus, a train of extremely short pulses is obtained without switching a radio frequency signal on and off at a high rate. An oscillator is coupled to a harmonic generator, and a power divider distributes the output of the harmonic generator to a multiplicity of amplifiers. Each amplifier has a phase-locked VCO circuit that provides frequency accuracy, spectral purity, low noise and frequency stability. Thus, each amplifier provides one of the spectral components of the predetermined radar pulse train. The amplifiers are coupled to a multiplexing feed that illuminates a reflector. On receive, the multiplexing feed separates the spectral components of the incoming pulse train. Each spectral component is coupled to its own narrow band receiver, and one receiver is used to amplify and detect each spectral component.