GNSS interference detection using statistical analysis in the time-frequency domain

Pai Wang, Ediz Cetin, Andrew G. Dempster, Yongqing Wang, Siliang Wu

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This paper presents a pre-correlation interference detection method based on statistical analysis in the timefrequency (TF) domain for global navigation satellite system (GNSS) signals. In particular, the short time Fourier transform (STFT) is considered as the TF tool due to its linear property and low computational complexity. A goodness-of-fit (GoF) test is applied to each frequency slice in the spectrogram of the received signal, which approximately follows a chi-square distribution in the absence of interference. The expected probability density function (PDF) of the observed TF-domain samples can be computed based on an interference-free signal or the noise power estimate. Two versions of the proposed technique are presented: one based on the canonical STFT with the maximum overlap size, and the other based on the block-wise STFT using nonoverlapped samples. The canonical STFT-based method shows better detection capability at the expense of degraded false alarm performance caused by the PDF distortion in the canonical STFT samples. The block-wise STFT-based method alleviates the false alarm issue but slightly weakens the detection capability. Simulations show that the proposed canonical and block-wise STFT-based methods improve the detection performance for both narrow- and wide-band interference in low jammer-to-noise ratio environments when compared with the existing GoF test applied to the time-domain samples.
Original languageEnglish
Pages (from-to)416-428
Number of pages13
JournalIEEE Transactions on Aerospace and Electronic Systems
Volume54
Issue number1
DOIs
Publication statusPublished - Feb 2018

Keywords

  • Global navigation satellite system
  • Interference
  • Jamming
  • Probability density function
  • Receivers
  • Statistical analysis
  • Time-frequency analysis
  • Global navigation satellite systems
  • goodness-of-fit test
  • interference detection
  • jamming detection
  • time-frequency analysis

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