University of Washington

Thruwave Inc.

Andreas Pedross-Engel

Matthew Stephen Reynolds

Daniel Arnitz

Claire Watts

Sandamali Devadithya

Claire M Watts

Matthew S Reynolds

The present application is directed to image beat pattern mitigation in two-sided reflection based 3-D millimeter wave imaging. In one example, active millimeter-wave (mmWave) imaging illuminates a scene with a source of mm Wave energy and forms images based on the reflected energy. Two-sided reflection imaging can be used to overcome the occlusion by the opaque objects that would plague a transmission imaging approach. The system can produce beat-pattern-free 3-D images of the products inside an optically-opaque corrugated cardboard shipping box and further, the two-sided reflection imaging approach with image beat pattern correction shows an increased image volume even if portions of the scene are occluded.

Systems and methods for image beat pattern mitigation

Examples of imaging systems are described herein which may implement microwave or millimeter wave imaging systems. Examples described may implement partitioned inverse techniques which may construct and invert a measurement matrix to be used to provide multiple estimates of reflectivity values associated with a scene. The processing may be partitioned in accordance with a relative position of the antenna system and/or a particular beamwidth of an antenna. Examples described herein may perform an enhanced resolution mode of imaging which may steer beams at multiple angles for each measurement position.

Millimeter wave and/or microwave imaging systems and methods including examples of partitioned inverse and enhanced resolution modes and imaging devices

Examples of active millimeter-wave imaging systems are described which may utilize modulation schemes to provide illumination signals. The use of modulation techniques may allow for the use of direct-conversion receivers while retaining an ability to separate desired received signal from self-jamming and/or DC offset signal(s) generated by the direct-conversion receivers. In some examples, modulation schemes include the use of balanced orthogonal codes which may support MIMO or massive MIMO imaging systems.

Millimeter wave imaging systems and methods using direct conversion receivers and/or modulation techniques

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Seattle, WA, United States of America

Andreas Pedross-Engel