Abstract
Chaff cloud is widely used in target covering. In this paper, a jamming performance estimation strategy is presented for the elliptical and cubic chaff clouds. The range profiles of the composite models of the plane with the chaff cloud are experimentally accessed in an anechoic chamber using a stepped-frequency waveform measurement system. Then, dimensions, characteristic length, and distributing entropy of the equivalent scattering centers of the plane and the jammer are extracted from the measured range profiles, respectively. Based on these features, support vector machines, naive Bayesian classification, and decision tree classification methods are employed to determine the recognition rate of the target under the chaff jamming, and then determine the jamming efficiency of the two kinds of chaff clouds. Results show that two types of chaff clouds are able to reduce the target recognition rate. Besides, when the radar uses the Euclidean distance and decision tree classification methods to complete the recognition task, a good jamming efficiency can be achieved by releasing the elliptical or the cubic chaff cloud. Meanwhile, a low level of jamming performance outcomes using the support vector machines classification method. It is also found that the chaff cloud released from the side of the plane achieves a better jamming performance compared with the other releasing locations. Finally, the influence of environmental noise on the recognition rate of the plane is studied. Estimating results show that the recognition rates decrease with the increasing of the power level of the noise. When the transmitting power level of the noise reaches 1.2 times the reflected power level of the target, it is quite hard to estimate the jamming performance of two kinds of chaff clouds.
Highlights
Chaff cloud is widely used in electronic countermeasures since the Second World War [1]
Lots of researchers devote their efforts to obtain the range profiles of the target, there are still quite a few published works that focus on the studying of one-dimensional imaging methods for the plane coexists with the chaff cloud owing to heavy EM computational loads
MEASUREMENT AND RESULTS indoor measurements are performed in the chamber to investigate the jamming performance of two types of the chaff cloud according to the methods mentioned above
Summary
Chaff cloud is widely used in electronic countermeasures since the Second World War [1]. Lots of researchers devote their efforts to obtain the range profiles of the target, there are still quite a few published works that focus on the studying of one-dimensional imaging methods for the plane coexists with the chaff cloud owing to heavy EM computational loads To overcome this obstacle, indoor scattering measurements are performed in this paper to obtain the scattering fields of the composite model of the chaff cloud with the plane at discrete frequency points using a stepped-frequency waveform measurement system. The chaff elements are inserted into low-radar cross section (low-RCS) cubes in order according to the divided chaff cloud model with the help of a specific insertion machine This proposed strategy provides an efficient and accurate way to perform a controllable test for obtaining the EM scattering of the chaff cloud.
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