Motorola Corporation

Edward J Groth, Jr

John E Bjornholt

Richard G Foster

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.

Monopulse tracking system substantially free of externally generated

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.

Multiple channel data link system

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.

Multiple mixer spread spectrum modulation and method therefor

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.

Data encoding and decoding communication system for three frequency FSK

A logic system for implementation of a feed-forward non-linear generator for producing a plurality of programmable complex sequences from an input bit stream.

Non-linear logic module for increasing complexity of bit sequences

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.

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Scottsdale, AZ, United States of America

Edward J Groth, Jr