• Title, Summary, Keyword: Contrast radiant intensity(CRI)

Search Result 5, Processing Time 0.026 seconds

A Study on the Management Methods of the Ship Infrared Signature (함정 적외선 신호의 관리방법 연구)

  • Cho, Yong-Jin
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.50 no.3
    • /
    • pp.182-189
    • /
    • 2013
  • In the development process of new naval ships, it is necessary to make the effort of the signature management and reduction of ship infrared(IR) signature to increase the ship survivability(susceptibility). So far the ship's contrast radiant intensity is used as a ship IR signature design criteria during the naval ship design stages. However, nowaday it is in a state of disorder at the basic design stage because of the lack of any related studies and methods. In this study, the IR signature management methods for improving the signature reduction and ship survivability are suggested by the comparison analysis of the advantages and disadvantages of signature management techniques. And also the criteria for the ship signature management are suggested when considering the infrared signature measuring assets and sea trial environments of the Korean peninsula.

A Feasibility Study on the Probabilistic Method for the Naval Ship Infra-red Signature Management (함정적외선신호 관리를 위한 확률론적 방법의 가능성 연구)

  • Park, Hyun-jung;Kang, Dae-soo;Cho, Yong-jin
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.56 no.5
    • /
    • pp.383-388
    • /
    • 2019
  • It is essential to reduce the Infra-red signature for increasing ship's survivability in ship design stage. However the ship's IR signature is quite sensitive to the maritime and atmosphere. Therefore, it is very important to select the marine meteorological data to be applied to the signature analysis. In this study, we selected the three meteorological sample sets from the population of the Korea Meteorological Administration's marine environment data in 2017. These samples were selected through the two-dimensional stratified sampling method, taking into account the geopolitical threats of the Korean peninsula and the effective area of the buoy. These sample sets were applied to three naval ships classified by their tonnage, and then the IR signature analysis was performed to derive the Contrast Radiant Intensity (CRI) values. Based on the CRI values, the validity of each sample set was determined by comparing Cumulative Distribution Function (CDF), and Probability Density Function (PDF). Also, we checked the degree of scattering in each sample set and determined the efficiency of analysis time and cost according to marine meteorological sample sets to confirm the possibility of a probabilistic method. Through this process, we selected the standard for optimization of marine meteorological sample for ship IR signature analysis. Based on this optimization sample, by applying probabilistic method to the management of IR signature for naval ships, the robust design is possible.

Analysis on Infrared Stealth Performance with Emissivity Controlled Aircraft Surface Structure at Various Background (항공기 적외선 스텔스 기술 적용을 위한 다양한 배경조건에서의 방사율 제어구조 성능 분석)

  • Bae, Munjang;Kim, Taehwan;Kim, Taeil;Jung, Daeyoon;Cho, Hyung Hee
    • Journal of the Computational Structural Engineering Institute of Korea
    • /
    • v.29 no.5
    • /
    • pp.455-461
    • /
    • 2016
  • Survivability of an aircraft has been greatly threatened by the development of a weapon system using infrared. Therefore, the infrared stealth technology is a very important technique to improve the survivability of an aircraft. In this study, the infrared signal of an aircraft was analyzed which corresponding to the aircraft surface temperature and environmental conditions with various surface conditions(especially emissivity changed). Based on the analyzed infrared signal, the optimized surface emissivity was suggested to reduce the average contrast radiance and contrast radiant intensity(CRI). In addition, we confirmed that the infrared contrast radiant intensity between the aircraft and the background can be minimized through an appropriately controlled surface emissivity of the aircraft at specific background.

A Comparative Study between Measurement and Prediction Results of a Naval Ship Infrared Signature in the Marine Environment (해상환경에서 함정 적외선 신호 측정 및 예측결과 비교 분석 연구)

  • Kim, Jung-Ho;Yoon, Yoon-Sik
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.48 no.4
    • /
    • pp.336-341
    • /
    • 2011
  • Ship infrared signature is the cause of detection and tracking by infrared sensor and anti-ship missile seeker. Recent warships have been applied the infrared stealth technology to reduce own ship infrared signature and tested to validate own ship infrared signature level. This study describes the two issues. Firstly, we describe the infrared measurement concept and infrared signature level establishment method that have been performed. Secondly, we compare and analyze the error components between the infrared measurement and simulation result.

Development of a Generalized Software for IR Image Generation and Analysis (적외선 영상 생성 및 분석을 위한 종합 소프트웨어 개발)

  • Han, Kuk-Il;Kim, Do-Hwi;Choi, Jun-Hyuk;Ha, Nam-Koo;Jang, Hyun-Sung;Kim, Tae-Kuk
    • KIISE Transactions on Computing Practices
    • /
    • v.23 no.3
    • /
    • pp.141-147
    • /
    • 2017
  • Recently there has been an increasing demand for developing a domestic software (S/W) for infrared signature generation to prevent technology leakage and match the domestic operating environment. In this study, we developed a S/W for infrared signature generation and presented its structures and functions for creating and analyzing the IR images of designated spectral bands. The proposed S/W generates IR images of an object through calculations of surface temperatures and IR signals including the self-emitted, surface reflected and path dependent radiances. Moreover, the proposed S/W includes the features of infrared threat analyses from the generated IR images including the infrared contrast radiant intensity (CRI), detection ranges or detection probability analyses, unlike the imported, commercial infrared signature generation S/W.