GNSS interference detection and excision using time-frequency representation

Chih Cheng Sun, Shau-Shiun Jan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

Today more than 600 million people worldwide rely on the Global Navigation Satellite System (GNSS) to deliver the Position, Velocity, and Time (PVT) information. However, unpredictable factors on the ground user environment, such as intentional or unintentional interferences, strongly degrade the performance of GNSS receiver especially under the urban forest or indoor environments. The interference might result in degraded navigation accuracy or complete loss of receiver tracking. A solution is represented by the Time-Frequency (TF) analysis which is capable of detecting and subsequently removing a great variety of disturbing signals. In this paper, an interference detection and excision scheme for GNSS Software Defined Receiver (SDR) is proposed. The time-frequency representation in this paper is chosen as the Fourier sine spectrum based time-frequency method, which is capable to represent the information on a spectrogram with small error. Once any interference is detected on the resulting spectrogram, its time-frequency components will be localized in the interference detection stage. An Infinite Impulse Response (IIR) notch filter is implemented in the interference excision stage to further excise the interference source. The bandwidth and its notch frequency are determined according to the previous interference detection process. Accordingly, the additional scheme accomplishes the interference detection and excision processes, and the filtered GNSS signal is therefore input to the conventional GNSS signal processes for positioning. Consequently, the performance of the SDR signal processing is improved with the proposed interference detection and excision scheme. In this paper, the analytical background of the time-frequency analysis is introduced. Several simulations and experiments are conducted to validate the effectiveness of the proposed time-frequency spectrogram method. The effect caused by the interference is greatly reduced by the IIR notch filter in the excision stage. The effectiveness of the interference detection and excision scheme is investigated based on the criterion of the estimated Signal-to-Noise Ratio (SNR) in GNSS signal acquisition process. Finally, the experiment results show that the proposed interference detection and excision scheme is effective to detect and localize interference sources, and subsequently excise the interference from the GNSS signal.

Original languageEnglish
Title of host publicationInstitute of Navigation - International Technical Meeting 2011, ITM 2011
Pages365-373
Number of pages9
Publication statusPublished - 2011 May 26
EventInstitute of Navigation - International Technical Meeting 2011, ITM 2011 - San Diego, CA, United States
Duration: 2011 Jan 242011 Jan 26

Publication series

NameInstitute of Navigation - International Technical Meeting 2011, ITM 2011
Volume1

Other

OtherInstitute of Navigation - International Technical Meeting 2011, ITM 2011
Country/TerritoryUnited States
CitySan Diego, CA
Period11-01-2411-01-26

All Science Journal Classification (ASJC) codes

  • Ocean Engineering

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