Study on interference suppression based on joint fractional Fourier domain and time domain

Huang, Kewu; Tao, Ran; Wu, Kui; Wang, Yue

doi:10.1007/s11431-011-4533-7

Cited by 9 publications

(3 citation statements)

References 17 publications

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“…In contrast, the NLFM method features lower sidelobes and a well-maintained main lobe width [33,34]. Therefore, NLFM is used to improve the side lobe suppression ratio [35,36]. The frequency-swept pulse with a large bandwidth can improve spatial resolution.…”

Section: Principle and Theoretical Analysismentioning

confidence: 99%

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

Li,

Zhang,

Yuan

et al. 2023

Sensors

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In the domain of optical fiber distributed acoustic sensing, the persistent challenge of extending sensing distances while concurrently improving spatial resolution and frequency response range has been a complex endeavor. The amalgamation of pulse compression and frequency division multiplexing methodologies has provided certain advantages. Nevertheless, this approach is accompanied by the drawback of significant bandwidth utilization and amplified hardware investments. This study introduces an innovative distributed optical fiber acoustic sensing system aimed at optimizing the efficient utilization of spectral resources by combining compressed pulses and frequency division multiplexing. The system continuously injects non-linear frequency modulation detection pulses spanning various frequency ranges. The incorporation of non-uniform frequency division multiplexing augments the vibration frequency response spectrum. Additionally, nonlinear frequency modulation adeptly reduces crosstalk and enhances sidelobe suppression, all while maintaining a favorable signal-to-noise ratio. Consequently, this methodology substantially advances the spatial resolution of the sensing system. Experimental validation encompassed the multiplexing of eight frequencies within a 120 MHz bandwidth. The results illustrate a spatial resolution of approximately 5 m and an expanded frequency response range extending from 1 to 20 kHz across a 16.3 km optical fiber. This achievement not only enhances spectral resource utilization but also reduces hardware costs, making the system even more suitable for practical engineering applications.

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Section: Principle and Theoretical Analysismentioning

confidence: 99%

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

Li,

Zhang,

Yuan

et al. 2023

Sensors

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“…In general, the interference suppression technologies can be classified into three schemes: time domain scheme, frequency domain scheme [1] and code-aided interference suppression scheme [2]. Wherein, the FDAJ algorithms with good application prospects, transform the complex filtering process in time domain into simple threshold comparison in frequency domain.…”

Section: Introductionmentioning

confidence: 99%

A novel iterative threshold for anti-jamming algorithm and its implementation on FPGA

Yao

et al. 2014

16th International Conference on Advanced Communication Technology

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Abstract-Frequency-domain anti-jamming (FDAJ) algorithms achieve prominent performance on interference suppression with simple calculations; and hence they are widely used in many applications. The interference suppression threshold plays a key role in the algorithm and affects system performance greatly. In this paper, the initial interference threshold is derived theoretically and then a novel FDAJ algorithm is proposed based on the iterative calculation of the threshold. With the iterative process, the optimal threshold for the interference suppression can be approached with little loss of valid signals; and the antijamming performance can be further improved. The simulation results validate well that our proposed iterative algorithm has superior performance for interference suppression. Finally, two FPGA-based implementations are presented: pipeline scheme and iterative scheme. After analysing the different characteristics of each implementation, we discuss the suitable applications for these schemes.

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“…Although there are many methods of suppressing jamming signals at present [1,2,4,5], it is not very effective to handle non-stationary jamming signal in practice.…”

Section: Introductionmentioning

confidence: 99%

Adaptive suppression method of radar jamming in joint time frequency domain

Meng

You-guang

et al. 2014

Proceedings of 2nd International Conference on Information Technology and Electronic Commerce

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A novel radar adaptive jamming suppression method based on joint time-frequency transformation is proposed. Confronting the challenges of non-stationary jamming signals that radar receives, a new technique is presented to deal with them. Firstly, the time-frequency characteristics of radar received signal are analyzed by short-time Fourier transform (STFT). Secondly, an adaptive filter function is constructed in STFT domain. By applying a proper threshold to the timefrequency modulus spectrum (TFMS), strong jamming signal can be adaptively eliminated, polluted signal can be shrunk slightly and the useful signals can be retained. Finally, simulations validate the efficiency of our new method.

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Study on interference suppression based on joint fractional Fourier domain and time domain

Cited by 9 publications

References 17 publications

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

A novel iterative threshold for anti-jamming algorithm and its implementation on FPGA

Adaptive suppression method of radar jamming in joint time frequency domain

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