Passive Infrared Ranging

Abstract

The range of an infrared source was estimated by analyzing the atmospheric absorption by CO2 in several wavelength intervals of its spectrum. These bandpasses were located at the edge of the CO2 absorption band near 2300 1/cm (4.3 micron). A specific algorithm to predict range was determined based on numerous computer generated spectra. When tested with these spectra, range estimates within 0.8 km were obtained for ranges between 0 and 18 km. Accuracy decreased when actual source spectra were tested. Although actual spectra were available only for ranges to 5 km, 63% of these spectra resulted in range estimates that were within 1.6 km of the actual range. Specific spectral conditions that affected the range predictions were found. Methods to correct the deficiencies were discussed. Errors from atmospheric variations, and the effects of background noise, were also investigated. Limits on accuracy and range resolution were determined.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1983
Accession Number
ADA138066

Entities

People

  • Norman K. Leonpacher

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Accuracy
  • Algorithms
  • Atmospheric Attenuation
  • Background Noise
  • Blackbody Radiation
  • Computers
  • Detection
  • Detectors
  • Electromagnetic Spectra
  • Frequency Bands
  • Infrared Signatures
  • Infrared Spectra
  • Normal Distribution
  • Pattern Recognition
  • Range Finding
  • Spectra

Readers

  • Approximation Theory.
  • Electronics Engineering
  • Wave Propagation and Nonlinear Chaotic Dynamics.