Edward John Groth

US Patent:

47060930, Nov 10, 1987

Filed:

Mar 26, 1984

Appl. No.:

6/593150

Inventors:

Edward J. Groth - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

G01S 502

US Classification:

342427

Abstract:

A monopulse tracking system utilizing at least two channels, each of which has a different spreading/despreading pseudo-random noise function associated therewith. In conjunction with a monopulse antenna, one of the channels is utilized to develop a sum signal and the other channel is utilized to develop a difference signal, which sum and difference signals are utilized in a phase detector to generate an error signal. Because different channels are utilized to develop the sum and difference signals, externally generated noise is uncorrelated in the phase detector and, therefore, biases caused by the noise are eliminated.

US Patent:

44479077, May 8, 1984

Filed:

Jan 11, 1982

Appl. No.:

6/338782

Inventors:

John E. Bjornholt - Mesa AZ
Richard G. Foster - Mesa AZ
Edward J. Groth - Scottsdale AZ

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

H04B 1500

US Classification:

375 1

Abstract:

A spread spectrum modulator and a method therefor wherein a plurality of binary code generators each being at the same fraction of a desired modulation frequency and all being at equal relative phase angles are used to serially bi-phase modulate an unspread carrier signal.

US Patent:

44256663, Jan 10, 1984

Filed:

Jan 29, 1982

Appl. No.:

6/344149

Inventors:

Edward J. Groth - Scottsdale AZ

Assignee:

Motorola Inc. - Schaumburg IL

International Classification:

H03K 1324

US Classification:

375 48

Abstract:

A system for three frequency FSK modulation wherein binary data bits are sequentially encoded into a ternary system of channels designated "1", "0" and "C", so that a data bit is encoded and transmitted in a "C" channel whenever it is the same as the previous data bit and wherein a transmission in the "C" channel is decoded as a continuation of the previous data bit. The data clock is recovered from the data stream at the transition between data bits and repeated data bits are detected as errors.

US Patent:

44942389, Jan 15, 1985

Filed:

Jun 30, 1982

Appl. No.:

6/393833

Inventors:

Edward J. Groth - Scottsdale AZ

Assignee:

Motorola, Inc. - Schaumburg IL

International Classification:

H04B 702

US Classification:

375 1

Abstract:

A coherent communications link for simultaneously transmitting intelligence on a plurality of non-contiguous frequency channels by means of a plurality of coherent carrier signals which are connected to a single composite intermediate frequency signal upon reception by a fully coherent receiver. The local oscillator signals in the receiver are maintained coherent with respect to the transmitted carrier signals responsive to the composite IF signal while each of the local oscillator signals is adjusted to maintain coherence of each received carrier in the face of relatively long term drift due to thermal shifts, path effects and hardware drift.

US Patent:

42297419, Oct 21, 1980

Filed:

Mar 12, 1979

Appl. No.:

6/019378

Inventors:

Edward J. Groth - Scottsdale AZ

Assignee:

Motorola, Inc.

International Classification:

H04J 514

US Classification:

370 24

Abstract:

A control unit and a remote unit each including a transmitter and receiver with the remote unit transmitter and control unit receiver being synchronized first by means of a variable oscillator in the control unit and connected to the receiver in a closed loop, and the transmitter of the control unit and receiver of the remote unit being synchronized second by sensing errors between a received signal and the operating frequency of the receiver in the remote unit and transmitting the error signal back to the control unit by way of the previously synchronized transmitter/receiver for controlling the frequency of the transmitter in the control unit.