Northrop Grumman Systems Corporation

Northrop Grumman Space & Mission Systems Corporation

James Richard Morris

One embodiment of the invention includes a synthetic aperture radar (SAR) system. The system comprises a radar transmitter configured to transmit a combined signal, the combined signal comprising a first signal that is a modulated SAR radar signal and a second signal that is a modulated signal. The system also comprises at least one radar receiver configured to receive a reflected combined signal that comprises a reflected first signal and a reflected second signal, and to demodulate the reflected first and second signals. The reflected first and second signals can correspond to the first and second signals having been reflected from a target. The system further comprises a radar image processor configured to generate a radar image of the target based on signal parameters associated with the reflected first signal and based on information comprised within the reflected second signal.

Synthetic aperture radar (SAR) imaging system

A direct sequence spread spectrum (DS-SS) communications modem for low signal to noise ratio applications and secure communications systems ( ). The modulator ( ) implements a quadrature-phase shift keying (QPSK) modulation scheme in which a pseudonoise code is supplied to one channel and a pseudonoise code is combined with data to define the other channel. The demodulator ( ) receives the modulated signal and utilizes a signal acquisition processor ( ) in order to detect the pseudonoise code applied to the first channel. Upon detection and acquisition of the first pseudonoise code, the second pseudonoise code may be determined in order to demodulate the second channel to yield the modulated data. The signal acquisition processor ( ) provides numerous parametric measurements to enable fine demodulator tuning and robust acquisition of the pseudonoise spreading codes on the I and Q channels.

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Reston, VA, United States of America

James Richard Morris