Robert Eugene Isaak

US Patent:

42076250, Jun 10, 1980

Filed:

Mar 6, 1961

Appl. No.:

4/093814

Inventors:

William E. Klund - San Diego CA
Woodrow H. Littrell - late of San Diego CA
Robert D. Isaak - San Diego CA

Assignee:

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

International Classification:

G01S 966

US Classification:

367135

Abstract:

2. In a sonar communication system, a transceiver for receiving doppler sals, a local oscillator for producing a first output signal of given frequency, a translation resolver connected to said local oscillator for regulating said first output signal, a modulator connected to said transceiver and said translation resolver for mixing said received doppler signals and said regulated first output signal, a filter coupled to said modulator for filtering said mixed signals, a precision clock oscillator adapted for producing a second output signal, a proportional resolver electrically coupled to said precision clock oscillator for regulating the frequency of said second output signal, a signal generator connected to said proportional resolver and driven by said regulated second output signal for generating a third output signal, a filter coupled to said signal generator for filtering said third output signal, a correlator electrically coupled to the outputs of said mixed signal filter and said third output signal filter for correlation thereof, a drive motor, means connected to said drive motor for regulating the speed and rotation thereof, and gear means interconnecting said drive motor and said translation and proportional resolvers for driving same at a predetermined speed ratio.

US Patent:

54936128, Feb 20, 1996

Filed:

Mar 27, 1962

Appl. No.:

5/183696

Inventors:

William E. Klund - San Diego CA
Woodrow H. Littrell - San Diego CA
Robert D. Isaak - San Diego CA
Richard G. Stephenson - Rolling Hills CA

Assignee:

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

International Classification:

H04K 102

US Classification:

380 6

Abstract:

The secure communication keying system has a noise generator whose output a predetermined finite band of noise within, for example, the zero to eleven hundred cycle per second range. The noise generator may be a pseudorandom noise generator that is synchronized with a given clock frequency. The output of the system may have noise-like characteristics, but it is encoded with any type of intelligence desired to be transmitted. The output signals simulate the ambient noise occurring within the communication medium and has the same frequency spectrum regardless of the frequency of the modulating signals supplied thereto.

US Patent:

42031648, May 13, 1980

Filed:

Mar 6, 1961

Appl. No.:

4/093811

Inventors:

Robert D. Isaak - San Diego CA
William E. Klund - San Diego CA
Woodrow H. Littrell - San Diego CA
Richard G. Stephenson - Rolling Hills CA

Assignee:

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

International Classification:

H04B 1100

US Classification:

367134

Abstract:

A secure sonar communication system for transmitting and receiving intellnce signals within an aqueous medium comprising in combination means for generating an electrical pseudo random noise signal within a predetermined bandwidth, means connected to said pseudo random noise generating means for selectively driving same at one of a plurality of predetermined frequencies, keying oscillator means adapted to selectively produce an output of one of a plurality of predetermined frequency signals, a balanced modulator means coupled to said pseudo random noise signal generating means and said keying oscillator means for mixing the output signals therefrom, bandpass filter means connected to the output of said balanced modulator means for passing the upper sideband thereof, means for receiving an electrical pseudo random noise signal, transducer means, said transducer means being capable of broadcasting acoustical energy upon excitation by the upper sideband from the aforesaid bandpass filter means and in proportion thereto and for producing an electrical pseudo random noise output signal in proportion to a received acoustical pseudo random noise signal, and means connected to the output of said bandpass filter means and the input of said electrical pseudo random noise signal receiving means for selectively connecting same to said transducer means during broadcasting and receiving operations respectively.

US Patent:

58056351, Sep 8, 1998

Filed:

Mar 17, 1964

Appl. No.:

4/352687

Inventors:

Daniel E. Andrews - San Diego CA
William E. Klund - San Diego CA
Robert D. Isaak - San Diego CA

Assignee:

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

International Classification:

H04B 169

US Classification:

375209

Abstract:

A secure communication system comprising: a first cyclical pseudo-random noise generator comprising determinable vable starting point means and an output; transmitting means for transmitting said pseudo-random noise generator output; receiving means for receiving said transmitting means transmissions, said receiving means having an output; recycling storage means for storing said receiving means output; a second cyclical pseudo-random noise generator identical to said first pseudo-random noise generator having an output and a reset input, said receiving means output connected to said reset input; a correlator having a first input connected to said storage means and a second input connected to said second pseudo-random noise generator output and an output from said correlator; and timing means connected to said receiving means output and said correlator output for measuring time elapsed between any output of said receiver and said correlator.

US Patent:

39582140, May 18, 1976

Filed:

Jul 19, 1963

Appl. No.:

4/296413

Inventors:

Daniel E. Andrews - San Diego CA
William E. Klund - San Diego CA
Robert D. Isaak - San Diego CA

Assignee:

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

International Classification:

G01S 966
H04K 100

US Classification:

340 3A

Abstract:

1. An encoded echo-ranging signal generator comprising in combination; A digital shift register having a plurality of binary encoded stages, A shift pulse generator coupled to said digital shift register for the tiy shifting thereof, An anti-coincidence circuit having a pair of inputs and an output with one of said inputs being connected to a predetermined stage of said digital shaft register and the other input thereof coupled to the output of said digital shift register and with the output thereof connected to the input of said digital shaft register, to randomly recirculate through said register the binary contents of said encoded stages, An echo-ranging system coupled to the output of said digital shift register, And a digital message encoder coupled to said digital shift register for the respective binary bit encoding of each stage thereof.