Short- and long-range passive imaging in millimeter-wave-band

The millimeter-wave passive radiometric imaging systems based on the single channel design are developed. The systems are intended for disclosure of dangerous objects concealed under persons' clothing in short distances and for passive visualization of remote targets. The low-noise compact receiver (noise factor 4.5dB for 90-100GHz) involving four stages was designed. Antenna systems based on aspheric lens and on parabolic reflector were adopted. The radiometric imaging peculiarities of the building materials were investigated. The systems successfully recognize the metallic weapon hidden under outer clothing at a distance about 10m and visualize remote targets at a distance of 170m.