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Optical Engineering

Range estimation of passive infrared targets through the atmosphere
Author(s): Hoonkyung Cho; Joohwan Chun; Doochun Seo; Seokweon Choi
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Paper Abstract

Target range estimation is traditionally based on radar and active sonar systems in modern combat systems. However, jamming signals tremendously degrade the performance of such active sensor devices. We introduce a simple target range estimation method and the fundamental limits of the proposed method based on the atmosphere propagation model. Since passive infrared (IR) sensors measure IR signals radiating from objects in different wavelengths, this method has robustness against electromagnetic jamming. The measured target radiance of each wavelength at the IR sensor depends on the emissive properties of target material and various attenuation factors (i.e., the distance between sensor and target and atmosphere environment parameters). MODTRAN is a tool that models atmospheric propagation of electromagnetic radiation. Based on the results from MODTRAN and atmosphere propagation-based modeling, the target range can be estimated. To analyze the proposed method’s performance statistically, we use maximum likelihood estimation (MLE) and evaluate the Cramer-Rao lower bound (CRLB) via the probability density function of measured radiance. We also compare CRLB and the variance of MLE using Monte-Carlo simulation.

Paper Details

Date Published: 22 April 2013
PDF: 9 pages
Opt. Eng. 52(4) 046402 doi: 10.1117/1.OE.52.4.046402
Published in: Optical Engineering Volume 52, Issue 4
Show Author Affiliations
Hoonkyung Cho, KAIST (Korea, Republic of)
Joohwan Chun, KAIST (Korea, Republic of)
Doochun Seo, Korea Aerospace Research Institute (Korea, Republic of)
Seokweon Choi, Korea Aerospace Research Institute (Korea, Republic of)

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