Abstract
Based on polarization conversion metamaterial, a novel method to counter single-polarization radar is proposed and discussed in this paper. Due to the resonance feature in the polarization conversion, energy attenuation and waveform distortion dual functions can be achieved. For radar, that will strongly reduce the SNR (Signal-to-Noise Ratio) of the matched filter and the probability of detection. A broadband polarization conversion metamaterial structure was designed with multi resonance frequencies. To evaluate the effectiveness, a typical pulse compression radar model was established, the waveform property, correlation loss in the matched filter and probability of radar detection were simulated and calculated. It was found that the metamaterial achieved the function of passive signal modulation, the echo energy was reduced markedly and great distortion was generated near the resonance frequencies, also the correlation loss in the matched filter was significantly increased especially near the resonance frequencies. Finally the calculated probability of radar detection gave furthermore proof of the effectiveness of the method.
Highlights
Electromagnetic metamaterials are artificially designed media composed of subwavelength structures, which have attracted great attention in recent years due to its extraordinary electromagnetic properties that traditional materials do not possess [1]-[4]
We took the familiar single linear polarization radar countering as example, designed a broadband polarization conversion metamaterial structure with multi resonance frequencies
In conclusion, a scheme of countering single polarization radar based on polarization conversion metamaterial was proposed
Summary
Electromagnetic metamaterials are artificially designed media composed of subwavelength structures, which have attracted great attention in recent years due to its extraordinary electromagnetic properties that traditional materials do not possess [1]-[4]. Besides the countering in the energy domain, some researchers have paid their attention to the signal property of the radar echo [10]-[13]. The waveform distortion caused by the resonance absorption effect of metamaterials or plasma can destroy the correlation between the transmitted signal and the echo, bringing additional jamming effect to the radar detecetion. Few works have concentrated on the polarization manipulation ability of metamaterials, which is an important domain in radar countering. Polarization conversion metamaterials would counter the radar detection in dual functions of energy attenuation and waveform distortion. We took the familiar single linear polarization radar countering as example, designed a broadband polarization conversion metamaterial structure with multi resonance frequencies. For stationary target without jamming material, the echo signal contains attenuation of the amplitude and time delay from the target, which can be expressed as [19]
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