Analysis of effect of coherent and incoherent components on RCS of chaff cloud
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초록
Chaff is the most basic electromagnetic countermeasure against radars. However, electromagnetic analysis of chaff clouds is very difficult because individual chaff has an electrically short and chaff cloud consisting of an extremely large number of chaffs. In this study, we estimated the radar cross section (RCS) of chaff clouds composed of 0.5λ, 0.75λ, and 1λ-long chaff fibers using the effective medium method (EMM) and analyzed the effect of coherent and incoherent RCSs on the average RCS of chaff clouds. The RCS obtained using the EMM was verified by comparing it with the results obtained using the method of moments applying the Monte Carlo method. At low densities, the RCS levels of chaff clouds, composed of 0.5λ-long chaff fibers and chaff clouds composed of 1λ-long chaff fibers, were almost in agreement. However, as the density increased, the RCS levels of chaff clouds composed of 1λ-long chaffs became much larger. Additionally, the chaff cloud composed of 0.75λ-long chaffs showed a lower RCS level than other chaff clouds because resonance did not occur. However, the RCS of the chaff cloud was mainly determined by the incoherent component as opposed to the coherent component, and the coherent RCS was negligible to a much lower level than the incoherent RCS.
Abstract
Chaff is the most basic electromagnetic countermeasure against radars. However, electromagnetic analysis of chaff clouds is very difficult because individual chaff has an electrically short and chaff cloud consisting of an extremely large number of chaffs. In this study, we estimated the radar cross section (RCS) of chaff clouds composed of 0.5λ, 0.75λ, and 1λ-long chaff fibers using the effective medium method (EMM) and analyzed the effect of coherent and incoherent RCSs on the average RCS of chaff clouds. The RCS obtained using the EMM was verified by comparing it with the results obtained using the method of moments applying the Monte Carlo method. At low densities, the RCS levels of chaff clouds, composed of 0.5λ-long chaff fibers and chaff clouds composed of 1λ-long chaff fibers, were almost in agreement. However, as the density increased, the RCS levels of chaff clouds composed of 1λ-long chaffs became much larger. Additionally, the chaff cloud composed of 0.75λ-long chaffs showed a lower RCS level than other chaff clouds because resonance did not occur. However, the RCS of the chaff cloud was mainly determined by the incoherent component as opposed to the coherent component, and the coherent RCS was negligible to a much lower level than the incoherent RCS.
참고문헌 (16)
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