Raytheon Company

Macdonald J Andrews

Richard G Berard

Arnold E Vandoren

Christopher A Hamner

David A Brennan

Joseph D Corn

Thomas J McDevitt

Curtis Combs

A method includes obtaining an in-phase (I) input signal and a quadrature (Q) input signal at a quadrature modulator. The method also includes performing constant envelope bi-phase shift keying (CE-BPSK) modulation using the quadrature modulator to generate a modulated output signal. The modulated output signal includes a CE-BPSK modulated waveform containing phase reversals, and the CE-BPSK modulated waveform has a substantially-constant amplitude during the phase reversals.

Constant envelope bi-phase shift keying (CE-BPSK) modulation for 'mode S' and other communication applications

A method includes obtaining an in-phase (I) input signal and a quadrature (Q) input signal at a quadrature modulator. The method also includes performing constant envelope bi-phase shift keying (CE-BPSK) modulation using the quadrature modulator to generate a modulated output signal. The I and Q input signals comprise complementary transitions that alter a frequency of the modulated output signal while maintaining a substantially-constant amplitude of the modulated output signal. The transitions of the Q input signal are associated with data being encoded onto the modulated output signal, and the modulated output signal represents the data using two phases and has phase reversals positioned between the two phases.

A system for calibrating an array antenna comprises a calibration antenna at a first location relative to an array antenna, a first set of calibration files, and a processor. Based on received far field data from a far field data test that was run on the array antenna, using the calibration antenna, the processor is configured to generate a model predicting the actual location of the calibration antenna relative to the array antenna and to generate predicted far field data based on the model. The model is adjusted, if needed, by comparing the predicted far field data with the received far field data. Based on the model, new calibration files are generated that substantially correlate to the actual location of the calibration antenna.

Portable apparatus and associated method for phased array field calibration

A PCMCIA electronics package adapted to enclose, and provides EMI shielding to, a printed circuit board (PCB). The PCB has an electrical connector adapted for plugging into a computer is at a one end and RF circuitry at the other end. Electronic components are disposed on an inner region of the surfaces of the PCB. The PCB has a ground plane conductor disposed therein. Electrically conductive strips are disposed on the surfaces of the PCB along opposing side edges and the other end of the PCB. A plurality of conductive vias pass through a portion of the PCB electrically connecting the electrical strip conductors to the ground plane conductor. A plurality of resilient, electrically conductive clips is provided. Each one of the clips has: a cup-shaped region disposed over a corresponding one of the PCB edges and the other end of the PCB. Side portions of the cup-shaped regions are in contact with conductive strips. The clips have an arm with a distal end elevated from the PCB. The package includes a pair of electrically conductive covers disposed over the PCB and in contact with the distal ends of the arms. Each clip is elongated and has an array of slots disposed in the distal end of the arm. The arm has a intermediate portion adjacent to the edge of the printed circuit board and the distal end of the arm curves outwardly from the intermediate portion of the arm.

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Douglas, MA, United States of America

Macdonald J Andrews