title: Time-of-Flight Microwave Camera.
abstract: Microwaves can penetrate many obstructions that are opaque at visible wavelengths, however microwave imaging is challenging due to resolution limits associated with relatively small apertures and unrecoverable "stealth" regions due to the specularity of most objects at microwave frequencies. We demonstrate a multispectral time-of-flight microwave imaging system which overcomes these challenges with a large passive aperture to improve lateral resolution, multiple illumination points with a data fusion method to reduce stealth regions, and a frequency modulated continuous wave (FMCW) receiver to achieve depth resolution. The camera captures images with a resolution of 1.5 degrees, multispectral images across the X frequency band (8 GHz-12 GHz), and a time resolution of 200 ps (6 cm optical path in free space). Images are taken of objects in free space as well as behind drywall and plywood. This architecture allows "camera-like" behavior from a microwave imaging system and is practical for imaging everyday objects in the microwave spectrum.
authors.affiliation: Massachusetts Institute of Technology Media Lab, 75 Amherst St., Cambridge, Massachusetts, USA, 02139.
authors.forename: Gregory
authors.initials: G
authors.lastname: Charvat
authors.affiliation: Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Michigan, USA 48824.
authors.forename: Andrew
authors.initials: A
authors.lastname: Temme
authors.affiliation: Massachusetts Institute of Technology Media Lab, 75 Amherst St., Cambridge, Massachusetts, USA, 02139.
authors.forename: Micha
authors.initials: M
authors.lastname: Feigin
authors.affiliation: Massachusetts Institute of Technology Media Lab, 75 Amherst St., Cambridge, Massachusetts, USA, 02139.
authors.forename: Ramesh
authors.initials: R
authors.lastname: Raskar