Frederick G Alpers

US Patent:

39787974, Sep 7, 1976

Filed:

Apr 28, 1971

Appl. No.:

5/142837

Inventors:

William W. Harrington - China Lake CA
Frederick C. Alpers - Riverside CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

F42C 1306
F42C 1100

US Classification:

102 702P

Abstract:

A radiometer is mounted in a guided missile for detecting electro-magnetic hermal power in the microwave region of the spectrum radiated from an area of suspected targets with circuitry coupled thereto to respond to a predetermined change in level of radiation to generate a warhead fuzing signal.

US Patent:

51609347, Nov 3, 1992

Filed:

Aug 27, 1984

Appl. No.:

6/649501

Inventors:

Frederick C. Alpers - Ridgecrest CA
Mervyn C. Hoover - Ridgecrest CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01S 302
G01S 504

US Classification:

342351

Abstract:

A MICrowave RADiometric (MICRAD) guidance system is disclosed which utilizes an antenna having four beams, designated right, left, up and down. Information from the four beams is monitored essentially 100% of the time by passing through appropriate ferrite cross-switching means to four separate receivers. Information from two of the receivers passes through a first multiplexer and feedback gain balancer to provide a target azimuth output, and information from the remaining two receivers passes through a second multiplexer and feedback gain balancer to provide a target elevation output. A local oscillator heterodynes each of the four receivers in common, and a switch driver couples each of the multiplexers to the ferrite cross-switching means and gain balancers for appropriate selection.

US Patent:

43509827, Sep 21, 1982

Filed:

Jun 3, 1974

Appl. No.:

5/476164

Inventors:

Frederick C. Alpers - Ridgecrest CA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G01S 1380

US Classification:

343 68R

Abstract:

A compact transponder for use with frequency-agile pulsed radars incorporng an Amplified Ferromagnetic Echo Device (AFED) which repeats, backwards, after a short and controllable delay, a microwave pulse fed into it.