Abstract
This article investigates the strategies to measure the scattering matrix and the extinction coefficient of the chaff corridor. A complete error model is adopted to describe the power transmission properties of the indoor measurement system. Based on this model, a polaristic calibration method is employed to correct the measurement errors. After calibration, a scattering matrix measurement method for different types of chaff corridors is addressed. When dealing with the extinction coefficient measurements, Beer-Lambert's law is introduced to describe the power loss of the electromagnetic wave passing through the chaff corridor. According to this law, a method of the extinction coefficient measurement for the chaff corridor is proposed. Finally, simulations and measurements are conducted to verify the methods presented in this article and obtain the electromagnetic scattering properties of various types of chaff corridors. Experimental results show that the scattering matrix and extinction coefficient are not sensitive to the polarization of the incident wave for uniformly distributed chaff corridor. Besides, high attenuation occurs when electromagnetic wave passes through the chaff corridor.
Highlights
The chaff cloud, emerging as a passive jammer, has been widely used in many battle scenarios for its low cost and high jamming performance
Many EM computational methods have been presented to determine the EM scattering properties of the chaff cloud. Researchers spontaneously start their efforts with the EM scattering evaluation of a single chaff element [4]–[6]
A specific device is designed for chaff elements insertion to guarantee the fabricating accuracy of the physical model
Summary
The chaff cloud, emerging as a passive jammer, has been widely used in many battle scenarios for its low cost and high jamming performance. The chaff cloud consists of a large number of small metal-fibers which can reflect the radar signals to produce a strong echo To ensure that it has an excellent jamming performance, complex geometric modeling and electromagnetic (EM) scattering evaluation processes are derived before it is put into use. One can evaluate the EM scattering properties of the chaff corridor directly using the probability density functions (PDFs) obtained from experiments [6], [23] These methods provide an efficient way to access the scattering power of the chaff corridor in a relatively short time. The polaristic calibration formulas are derived based on the matrix method and the Mason equation, which gives no analytical formulas for the process of the calibration and the measurement This strategy results in computational complexity in applying these methods.
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