THz Hilbert-Transform Spectrum Analyzer Based on High- $T_{c}$ Josephson Junction in Stirling Cryocooler

Frequency hopping (FH) signal is widely adopted by military communications as a kind of low probability interception signal. Therefore, it is very important to research the FH signal detection algorithm. The existing detection algorithm of FH signals based on the time-frequency analysis cannot satisfy the time and frequency resolution requirement at the same time due to the influence of window function. In order to solve this problem, an algorithm based on wavelet decomposition and Hilbert-Huang transform (HHT) was proposed. The proposed algorithm removes the noise of the received signals by wavelet decomposition and detects the FH signals by Hilbert-Huang transform. Simulation results show the proposed algorithm takes into account both the time resolution and the frequency resolution. Correspondingly, the accuracy of FH signals detection can be improved.

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“…where ε is a predetermined limitation, 8 then we have the first IMF component c 1 (t) The residue of the signal is…”

Section: Hilbert-huang Transformmentioning

confidence: 99%

Frequency hopping signal detection based on wavelet decomposition and Hilbert–Huang transform

2017

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“…Recovery is usually done according to standard relation between the Hilbert and Fourier transforms, i.e., with the double Fourier transform with an intermediate multiplication of the result of first Fourier transformation on the sign(f ) function [10]. This recovery technique works very good [8] if the Josephson junction is described by the idealized resistively shunted junction (RSJ) model [4]. More complicated algorithms were used to recover the data in the case of the junctions with deviations from the RSJ model [11].…”

Section: Theorymentioning

confidence: 99%

“…A developed Hilbert-transform spectrum analyzer is described earlier [8]. A photograph of the spectrum analyzer integrated on a compact, maintenance-free Stirling cooler SL200 (AIM Infrarot Module GmbH) is shown in Fig.…”

Section: Spectrum Analyzermentioning

confidence: 99%

“…Recently, a THz Hilbert-transform spectrum analyzer has been developed based on dynamics and technology of high-T c Josephson junctions [8]. An important and user-friendly aspect of this development is that an electrically-driven Stirling cooler was used to cool the junction for the temperature below the critical temperature of the superconducting material.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Applications of Hilbert-Transform Spectral Analysis

Divin

Snezhko

Lyatti

et al. 2014

IEEE Trans. Appl. Supercond.

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Bridging of the terahertz gap in the electromagnetic spectrum between the microwave and infrared ranges requires a variety of new technological developments from basic elements, such as emitters and detectors, to complete systems, such as spectrum analyzers and imagers. As an example of these developments, Hilbert-transform spectral analysis of terahertz radiation sources has been demonstrated. A spectrum analyzer based on a high-T c square-law Josephson detector has been developed and characterized in the frequency range from 50 to 1800 GHz. Spectra of output terahertz radiation from optically-pumped lasers and frequency multipliers have been studied, and their regimes were optimized for a single-frequency operation. Starting from the optimized multipliers, a polychromatic source has been synthesized and characterized with Hilbert-transform spectrum analyzer.

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“…It has a super wide voltage electronic regulation by a basic ratio 2eV = hω [1]. Numerous sensitive microwave receivers based on Josephson effects have been introduced [7]- [9]. In this paper, we intend to present some theoretical basis about noise parameters of the receiving system on JJ.…”

mentioning

confidence: 99%

Possibilities to Make Panoramic Receiver–Frequency Meter in Terahertz Band Based on Josephson Junctions

Denisov

Qiu

et al. 2015

IEEE Trans. Appl. Supercond.

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Based on previous theoretical and experimental investigations, possibilities of using Josephson junctions (JJs) to realize a new type of wideband frequency meter integrated with panoramic receiver (PRF) in terahertz band in a single unit were described in this paper. The suggested device can be particularly valuable for experimental purposes in terahertz band, where available equipment for frequency-domain measurements are usually of narrow band and expensive. It will be particularly useful to measure, for instance, the operating frequency of new generators in terahertz band whose radiation power is small, and operating frequency may deviate significantly from its design specification. Such a device can be realized by integrating two circuits in a single unit based on the JJ. The first circuit is a receiver based on JJ operating in a self-pump-mode regime, whereas the second one is a super wideband frequency meter using JJ operating as its natural measuring device.

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THz Hilbert-Transform Spectrum Analyzer Based on High- $T_{c}$ Josephson Junction in Stirling Cryocooler

Cited by 12 publications

References 18 publications

Frequency hopping signal detection based on wavelet decomposition and Hilbert–Huang transform

Frequency hopping signal detection based on wavelet decomposition and Hilbert–Huang transform

Terahertz Applications of Hilbert-Transform Spectral Analysis

Possibilities to Make Panoramic Receiver–Frequency Meter in Terahertz Band Based on Josephson Junctions

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