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Passive Determination of Temperature and Range Using Spectral Band Measurements of Photon Emittance
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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The established concept of temperature determination from dual spectral band radiometric measurement is analyzed for the case that the measurement device is sensitive to total photon emittance rather than radiant emittance. A temperature dependent ratio of measurements is calculated for two distinct spectral bands using a black body distribution. It is shown that, if the bands are not self contained, then there exists a one-to-one correspondence between temperature and ratio. A prototype algorithm is proposed and tested which demonstrates the feasibility of extracting both the temperature and range by using three distinct spectral band measurements. The model assumes nonhomogeneous, wavelength-dependent atmospheric attenuation. The target and sensor systems each have an arbitrary location in a vertical plane relative to the earth. In the computer simulations, LOWTRAN data was used. passive ranging, temperature determination, photon emittance, spectral band measurements.
APPROVED FOR PUBLIC RELEASE