USA As Represented by Secretary of the Navy

Nixon A Pendergrass

David R Emerson

Gregory D Hughes

Fletcher A Blackmon

Sherry E Hammel

Kai F Gong

Dean J Smith

Susan M Jarvis

Kevin C Fitzpatrick

Maria C Santos

Ronald R Morrissey

A system adapted for use with an electromagnetic transmitter and receiver system is provided comprising an electromagnetic transmitter and receiver system comprising an antenna, wherein the electromagnetic transmitter and receiver system is adapted to produce a transmitted signal for antenna pattern measurement which is transmitted through the antenna; a case located in proximity to the electromagnetic transmitter; at least one measurement probe disposed inside the case without changing the antenna's emission pattern, wherein the case, with the probe dispose therein, is placed no closer to the antenna than a limitation on the transmitter and receiver system component comprising a dynamic range associated with radio frequency energy received by the probe from the antenna; and an output section adapted to send results from the antenna pattern measurement received by the probe to a remote location away from the transmitter and receiver system for recording and analysis, the analysis comprising producing an antenna pattern measurement for the transmitter and receiver system.

Antenna systems and methods for over-the-air transmitter signal measurement

A system and method of manufacturing the same adapted for use with an electromagnetic receiver or transceiver system comprising at least one antenna, wherein the electromagnetic receiver or transceiver system is adapted to measure signal levels for in situ antenna pattern or link budget measurements using at least one signal measurement probe placed in the signal receive path without affecting said antenna's emission pattern or receiver performance. The system further includes an output section adapted to send results from said in situ antenna pattern or link budget measurements to a remote location away from said receiver or transceiver system for recording and/or analysis.

Versatile antenna received signal strength measurement system not affecting antenna pattern and receiver performance

An undersea communications system in which a message is converted to a redundant fixed-length data packet and transmitted acoustically as a quadrature phase-keyed signal in a frequency band with a continuous pilot signal at a frequency closely adjacent to the frequency band. A receiver uses the received continuous pilot signal to Doppler compensate the incoming quadrature phase keyed signal by estimating any Doppler distortion in the received pilot signal. The resultant redundant signals are then robustly processed coherently and jointly by the adaptive decision feedback equalizer and decoder to provide the original transmitted data.

System for undersea digital acoustic communications

A system for compensating for noise induced in a sensor data stream from a sensor array towed by a towing device includes a towing device motion data input receives a towed motion data stream representative of towing motion of the towing device. A sensor array input for receiving the sensor data stream. An adaptive filter connected to the towing device motion data input and the sensor array input for receiving the towed motion data stream from the towing device motion data input and the sensor data stream from the sensor array input and for generating a corrected sensor data stream representing sensor array data with ship motion noise attenuated therefrom.

System and method for compensating for towed array motion induced errors

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Nashville, IN, United States of America

Nixon A Pendergrass