Northrop Grumman Systems Corporation

Stephen G Kaiser

Stuart John Collar

Mark D Hischke

Shannon Mary Nelson

Dana Lynn Bourbonnais

An unattended ground sensor for the monitoring of a remote area. The unattended ground sensor comprises a housing that supports a power source, a communications module, at least one sensor module and a mainframe module. Additionally, the unattended ground sensor includes a common electrical bus in electrical communication with the power source, the communications module, the at least one sensor module, and the mainframe module. The common electrical bus is operative to provide a communications pathway between the power source, the communications module, the at least one sensor, and the mainframe module. Accordingly, the mainframe module is operative to control the operation of the unattended ground sensor through the common electrical bus.

Modular open system architecture for unattended ground sensors

A moving target simulator for testing a radar system has a radio frequency receiver, a digital radio frequency memory in electrical communication with the radio frequency receiver for storing a signal received thereby, a digital delay circuit in electrical communication with the digital radio frequency memory for providing a time delay between reception and transmission of the radio frequency signal, an amplitude modulation circuit in electrical communication with the digital radio frequency memory for modulating an amplitude of the radio frequency signal, a Doppler modulation circuit in electrical communication with the digital radio frequency memory for providing a Doppler-modulated signal, and a radio frequency transmitter for transmitting the radio frequency signal after it has been delayed, amplitude-modulated, and/or Doppler-modulated.

Moving target simulator

This invention synthesizes a continuous wave signal from a finite periodic complex signal waveform by digitizing the finite waveform, matching the phase of the digitized waveform at its recorded beginning (head) to its recorded end (tail) and then playing out the waveform over and over in a head-to-tail fashion. The quality of the 'phase match' between the waveform head and tail as well as the head-to-tail segment length determines the frequency accuracy of the synthesized continuous waveform. The basic formula ##EQU1## is used.

Continuous wave synthesis from a finite periodic waveform

A correlation detector, in which an input signal is applied to a first path and a second path. The correlation detector includes an arithmetic sign control device applied to the first path and the second path, replacing the more transitional digital multipliers. Additionally, a comparator is used in the present invention which replaces the more traditional A/D converters.

Correlation detector employing two level A/D conversion and arithmetic

A method for mitigating interference among a plurality of radar sets utilizes the steps of: determining the direction in which a radar antenna is pointing; selecting one of a plurality of different non-interfering radar signals based upon the direction that the radar antenna is pointing, each different non-interfering radar signal beam dedicated to a particular direction of the radar antenna; and utilizing the selected radar signal. Radar antennae pointed toward one another do not interfere with one another since they are both using different non-interfering radar signals.

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Hoffman Estates, IL, United States of America

Stephen G Kaiser