Compact PMMW camera calibration target

A passive millimeter-wave (PMMW) camera comprising:

• a focal plane array (FPA) including a plurality of receivers each including a feed horn;
• a thermal calibrator including a first thermally conducting body, a second thermally conducting body, a first black body target mounted to a front surface of the first conducting body, a second black body target mounted to a front surface of the second conducting body, and a thermo-electric (TE) cooling device having a hot side and a cold side that are on opposite sides of the device from each other, wherein the hot side of the TE cooling device is thermally attached to the first conducting body and the cold side of the TE cooling device is thermally attached to the second conducting body;
• and
• a track positioned proximate to the FPA, said thermal calibrator being mounted to the track so as to be slidably positionable thereon, said track allowing the calibrator to be selectively moved in front of the FPA.