Aircraft Signature Studies Using Infrared Cross Section and Infrared Solid Angle

Mahulikar, Shripad P.; Rastogi, Pallavi; Bhatt, Ashish

doi:10.2514/1.c036370

Cited by 6 publications

(1 citation statement)

References 41 publications

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“…In the space-based observation view, the reflected radiation from the airframe is considered to be mainly direct solar radiation, solar scattered radiation, cloud radiation and atmospheric emitted radiation. The aircraft plume nozzle radiation is equivalent to that of a cylindrical thermal cavity and is considered to be typical grey body radiation with an emissivity of approximately 0.9 16 . The plume is a non-uniformly distributed high temperature gas.…”

Section: Aerial Target Space-based Infrared Observation Characteristi...mentioning

confidence: 99%

The impact of atmospheric content changes on space-based infrared detection for aerial targets

Li,

Jia,

et al. 2023

Infrared, Millimeter-Wave, and Terahertz Technologies X

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Space-based infrared technology has the potential to detect aerial targets globally, for which strong atmospheric absorption of the background radiometric signal provides spectral detection windows. However, the atmospheric content varies in time and space, affecting its attenuation of the background. It is therefore necessary to assess the impact of the variation in the atmospheric content of absorption gas on the target detection. Based on the aerial target space-based observation characteristics model, the target radiation contribution ratio and the target-background contrast were calculated for different atmospheric contents with reference to the typical atmospheric profiles. The variation of the target-background relative differences due to changes in gas content was discussed. Furthermore, the range of change in the target-background contrast and signal-to-noise ratio(LSNR) for different atmospheric contents was calculated, considering instrument response characteristics. The effect of atmospheric content and full width at half maximum (FWHM) variation on the stability of the target-background relative relationship was analyzed. The findings highlight that the target radiation contribution ratio and the target-background contrast are more significantly affected by changes in water vapor, while changes in carbon dioxide concentration have little effect due to its large content base. Spectral bands where water vapor and carbon dioxide interact can reduce the effects of water vapor changes, but require narrow FWHM. But the too narrow FWHM can lead to changes in the target-background relative relationship and reduce its stability due to the influence of instrument noise. This research helps to understand the impact of changes in atmospheric condition on space-based infrared detection of aerial targets and the challenges faced in developing detection algorithms.

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Section: Aerial Target Space-based Infrared Observation Characteristi...mentioning

confidence: 99%

The impact of atmospheric content changes on space-based infrared detection for aerial targets

Li,

Jia,

et al. 2023

Infrared, Millimeter-Wave, and Terahertz Technologies X

View full text Add to dashboard Cite

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Aerosol infrared stealth technology: Theory and development of infrared suppression and particle dispersion in aircraft plume

Sun

Zhang

et al. 2023

Thermal Science and Engineering Progress

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Aircraft visibility in view from below in the long-wave infrared band using infrared cross section

et al. 2022

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Aircraft low observables’ features are crucial in the long-wave infrared (LW-IR) band, due to imaging sensors used in IR search and track and in the latest generation of IR-guided missiles. Earthshine irradiance on the aircraft bottom surface is an important source; hence, it is derived using data for atmospheric transmission. Emission due to skin-friction heating (important at high ε b o t ) and earthshine reflection (important at low ε b o t ) are compared by a dimensionless ratio for different bottom surface emissivities ( ε b o t ). The infrared cross section of aircraft in direct view from below is obtained in the LW-IR band, which shows that aircraft is seen also due to negative contrast.

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Aircraft Signature Studies Using Infrared Cross Section and Infrared Solid Angle

Cited by 6 publications

References 41 publications

The impact of atmospheric content changes on space-based infrared detection for aerial targets

The impact of atmospheric content changes on space-based infrared detection for aerial targets

Aerosol infrared stealth technology: Theory and development of infrared suppression and particle dispersion in aircraft plume

Aircraft visibility in view from below in the long-wave infrared band using infrared cross section

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