&lt;title&gt;NIRATAM-NATO infrared air target model&lt;/title&gt;

Noah, Meg A.; Kristl, Joseph A.; Schroeder, Jessica; Sandford, B. P.

doi:10.1117/12.44537

Cited by 26 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The radiant intensity of the exhaust plume is calculated using a modified version of the NATO Infrared Air Target Model (NIRATAM) [4]. The major modification consists of replacing the (2D) rotation-symmetric exhaust plume provided by NIRATAM's sub-model N-plume by the (asymmetric (3D)) ship exhaust plume provided by the CFD code discussed in the previous section.…”

Section: Plume Radiation Calculationsmentioning

confidence: 99%

“…To calculate the IR signature of the exhaust plume one needs to calculate the radiation by the gas in the exhaust plume as well as the transmission through the plume. The gas radiation calculations are performed by a modified version of NIRATAM [4]. A computational fluid dynamics (CFD) model is used to provide information on the 3D flow field of the exhaust plume (spatial coverage, gas concentrations, densities, and temperatures), which then can be used as input to the gas radiation calculations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Propagation of light through ship exhaust plumes

et al. 2014

View full text Add to dashboard Cite

Looking through the atmosphere, it is sometimes difficult to see the details of an object. Effects like scintillation and blur are the cause of these difficulties. Exhaust plumes of e.g. a ship can cause extreme scintillation and blur, making it even harder to see the details of what lies behind the plume. Exhaust plumes come in different shapes, sizes, and opaqueness and depending on atmospheric parameters like wind speed and direction, as well as engine settings (power, gas or diesel, etc.). A CFD model is used to determine the plume's flow field outside the stack on the basis of exhaust flow properties, the interaction with the superstructure of the ship, the meteorological conditions and the interaction of ship's motion and atmospheric wind fields. A modified version of the NIRATAM code performs the gas radiation calculations and provides the radiant intensity of the (hot) exhaust gases and the transmission of the atmosphere around the plume is modeled with MODTRAN. This allows assessing the irradiance of a sensor positioned at some distance from the ship and its plume, as function of the conditions that influence the spatial distribution and thermal properties of the plume. Furthermore, an assessment can be made of the probability of detecting objects behind the plume. This plume module will be incorporated in the TNO EOSTAR-model, which provides estimates of detection range and image quality of EO-sensors under varying meteorological conditions.

show abstract

Section: Plume Radiation Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Propagation of light through ship exhaust plumes

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Up to now, several studies have been conducted through experimental investigations 2) and numerical simulations. [3][4][5] Cline et al 2) reported a successful validation of the F/A-22 IR signature prediction model by using in-flight IR radiometric measurements. The results demonstrated the compliance with the IR signature specification of the F/A-22 program.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that the contrast of emission against the background determines the IR signature level. In 1991, a computer model, NIRATAM (NATO infrared air target model), was developed by the NATO-organized RSG6 Ó 2012 The Japan Society for Aeronautical and Space Sciences (research study group on infrared signatures of aircraft, helicopters and anti-aircraft missiles), 4) enabling the IR signature of an aircraft in natural environments to be predicted. Rao and Mahulikar 5) assessed the aircraft susceptibility from the first principles against the threat posed by passively guided IR homing missiles.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effectiveness of Infrared Signature Suppression of Aircraft Skin

Wang

Kwon

2012

Trans. Japan Soc. Aero. S Sci.

View full text Add to dashboard Cite

During typical supersonic cruising, the temperature of the aircraft skin rises above 300 K due to aerodynamic heating. In this situation, aircraft-skin infrared (IR) suppression, used to minimize the radiation contrast from the background is a crucial survival technology. In the present study, a technique to evaluate the effectiveness of IR suppression of aircraft skin is proposed. For this purpose, a synthetic procedure based on numerical simulations has been developed. In this procedure, the thermal status of aircraft skin is obtained using a computational fluid dynamics (CFD) method for complex aircraft geometries. An IR signature model is proposed using a reverse Monte Carlo (RMC) technique. The detection range and the IR contrast are adopted as the performance indicators for the evaluation of the aircraft IR suppression. The influence of these factors related to the aircraft-skin radiation, such as aircraft-skin emissivity, surface temperature distribution and flight speed, on the IR contrast and the detection range is also studied. As a test case, the effectiveness of various IR suppression schemes was analyzed for a typical air combat situation. Then, the method is applied to clarify the contribution of each aircraft component to the IR suppression of the overall IR radiation. The results show that aircraftskin temperature control and emissivity control are effective means to reduce the IR radiation and to achieve lower detection. The results can be used as a practical guide for designing future stealth aircraft.

show abstract

“…Mahulikar 3 , et al proposed a survey study of infrared signature of aerospace vehicles. Some standard models for prediction of IR signature were introduced in their article, such as NIRATAM 4 , SPRITITS 5 , SIRUS 6 , and IRST. There are also other standard models.…”

Section: Introductionmentioning

confidence: 99%

Impact of Background Radiation on the Long Wave Infrared Radiation Characteristics of Aircraft at High Altitude

Huang

2016

DSJ

View full text Add to dashboard Cite

Reflected background infrared radiation is an important contributor to the aircraft total infrared radiation. A reverse Monte Carlo ray tracing method to compute the infrared radiation signature of aircraft was introduced. The impact of atmospheric and ground radiation on the long wave infrared radiation signature of aircraft at the altitude of 11 km is analysed. The flight speed is Mach 0.8. The horizontal detection directions, downward detection directions and upward detection directions are considered. The results show that in the horizontal plane, the ratio of reflected background infrared radiation to self infrared radiation is about 10 per cent in summer, and 7 per cent in winter; the ratio values distributed in the front and side of the aircraft are bigger than that in the rear; and the existence of atmospheric and ground infrared radiation makes the apparent radiance temperature of the lower part of the aircraft higher than that of the upper part of the aircraft.

show abstract

<title>NIRATAM-NATO infrared air target model</title>

Cited by 26 publications

References 0 publications

Propagation of light through ship exhaust plumes

Propagation of light through ship exhaust plumes

Evaluating the Effectiveness of Infrared Signature Suppression of Aircraft Skin

Impact of Background Radiation on the Long Wave Infrared Radiation Characteristics of Aircraft at High Altitude

Contact Info

Product

Resources

About