초록 ▼

Disclosed is a method and apparatus for enhancing target detection, particularly in the millimeter wave frequency range, through the utilization of an imaging radiometer. The radiometer, which is a passive thermal receiver, detects the reflected and emitted thermal radiation of targets within a pred

Disclosed is a method and apparatus for enhancing target detection, particularly in the millimeter wave frequency range, through the utilization of an imaging radiometer. The radiometer, which is a passive thermal receiver, detects the reflected and emitted thermal radiation of targets within a predetermined antenna/receiver beamwidth. By scanning the radiometer over a target area, a thermal image is created. At millimeter wave frequencies, the received emissions from the target area are highly dependent on the emissivity of the target of interest. Foliage will appear “hot”due to its high emissivity and metals will appear cold due to their low emissivities. A noise power illuminator is periodically actuated to illuminate the target of interest. When the illuminator is actuated, the role of emissivity is reversed, namely poorly emissive targets will generally be good reflectors which in the presence of an illuminator will appear “hot”. The highly emissive targets (such as foliage and dirt) which absorb most of the transmitted energy will appear almost the same as in a non-illuminated, passive image. Using a data processor, the intensity of the passive image is subtracted from the intensity of the illuminated, active image which thereby cancels the background foliage, dirt, etc. and the reflective metallic targets are enhanced.

대표청구항 ▼

A radiometric imaging system for sensing electromagnetic energy from a target area, comprising: an illuminator means comprising a transmit antenna and transmitter means for producing random electromagnetic energy for illuminating said target area; a radiometer comprising a receive antenna and receiv

A radiometric imaging system for sensing electromagnetic energy from a target area, comprising: an illuminator means comprising a transmit antenna and transmitter means for producing random electromagnetic energy for illuminating said target area; a radiometer comprising a receive antenna and receiver means, said radiometer for receiving and measuring the intensities of both the illuminated thermal image as well as the non-illuminated passive image from said target area in a predetermined frequency band, and means coupled to said radiometer for inverse filtering and subtracting the intensities of the non-illuminated target area from the intensities of the illuminated target area to provide enhanced target detection.