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Sensors 2017, 17(9), 2042; https://doi.org/10.3390/s17092042

Anti-Sweep Jamming Design and Implementation Using Multi-Channel Harmonic Timing Sequence Detection for Short-Range FMCW Proximity Sensors

School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
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Received: 21 July 2017 / Revised: 22 August 2017 / Accepted: 5 September 2017 / Published: 6 September 2017
(This article belongs to the Special Issue Low Power Embedded Sensing: Hardware-Software Design and Applications)
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Abstract

Currently, frequency-modulated continuous-wave (FMCW) proximity sensors are widely used. However, they suffer from a serious sweep jamming problem, which significantly reduces the ranging performance. To improve its anti-jamming capability, this paper analyzed the response mechanism of a proximity sensor with the existence of real target echo signals and sweep jamming, respectively. Then, a multi-channel harmonic timing sequence detection method, using the spectrum components’ distribution difference between the real echo signals and sweep jamming, is proposed. Moreover, a novel fast Fourier transform (FFT)-based implementation was employed to extract multi-channel harmonic information. Compared with the traditional band-pass filter (BPF) implementation, this novel realization scheme only computes FFT once, in each transmission cycle, which significantly reduced hardware resource consumption and improved the real-time performance of the proximity sensors. The proposed method was implemented and proved to be feasible through the numerical simulations and prototype experiments. The results showed that the proximity sensor utilizing the proposed method had better anti-sweep jamming capability and ranging performance. View Full-Text
Keywords: FMCW; proximity sensor; anti-sweep jamming; timing sequence detection; ranging FMCW; proximity sensor; anti-sweep jamming; timing sequence detection; ranging
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Kong, Z.; Li, P.; Yan, X.; Hao, X. Anti-Sweep Jamming Design and Implementation Using Multi-Channel Harmonic Timing Sequence Detection for Short-Range FMCW Proximity Sensors. Sensors 2017, 17, 2042.

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