HORIZONTAL POLARISIERTE BREITWINKELRADAR- OBJEKTERKENNUNG

摘要

An apparatus (22) for producing and detecting a pattern of light projected some distance to illuminate objects or features (10, 12, 16, 18) that may reflect or scatter said light back to said apparatus, comprising: an optical energy source (30) configured to emit optical energy that is substantially limited to a first range of wavelengths that correspond to a range of wavelengths that are substantially absorbed by the atmosphere of the earth in preference to nearby adjacent wavelengths; and an optical energy receiver (32) configured to receive the optical energy emitted by said optical energy source after the optical energy has been reflected or scattered from the objects or features within the illuminated pattern of said apparatus such that the range of wavelengths that said receiver is operable to receive is substantially limited to a second range of wavelengths that corresponds to the said range of wavelengths that are substantially absorbed by the atmosphere of the earth in preference to nearby adjacent wavelengths.