Angle measurement by comparing the amplitude technique of the sum-difference pattern radiometer

The radiometer receives the radiation energy of the natural material (Sato, 2008). The detection system of the millimeter wave receives the millimeter wave thermal radiation energy of the electromagnetic spectrum object emitted by the radiometer of high sensitivity. And then, target recognition can be realized by the energy difference of the target and background (Li, 2009). In this paper, we design an AC all-power radiometer of sum-difference patterns at 3 mm.