| Autor: |
Sun, Kewen, Yu, Baoguo, Xu, Liangfeng, Elhajj, Mireille, Yotto Ochieng, Washington |
| Zdroj: |
IEEE Transactions on Instrumentation and Measurement; 2024, Vol. 73 Issue: 1 p1-17, 17p |
| Abstrakt: |
This article has proposed a new and efficient Global Navigation Satellite System (GNSS) anti-interference method using fractional Fourier transform (FrFT) and notch filtering. An effective optimal fractional order determination model based on the generalized time–fractional bandwidth product (GTFrBP) of the FrFT has been developed in the detection of GNSS interfering signal, which can be realized using an efficient 1-D search scheme and provide estimated interfering parameters. The GNSS interference mitigation can be realized through dechirping and notch filtering operations based on the obtained GNSS interference detection and estimation results. These proposed techniques in interference detection and mitigation are verified using real GPS L1-C/A signal interfered by the sweep interference. The results demonstrate that the developed GTFrBP search model delivers satisfactory precision in the determination of the optimal fractional order of the FrFT in the GNSS interference detection procedure; and the GNSS anti-interference experimental results have proven that the developed GNSS anti-interference method can successfully suppress the sweep interference present in the received GPS L1-C/A signal, which ensures that the acquisition performance of the GNSS receiver can be greatly improved in the interfering environments. The validity and effectiveness of the developed anti-interference method for GNSS receivers can be further verified by the carrier power-to-noise power density ratio ( $C/N_{0}$ ) curve and jamming tolerance analysis results, which have proven that the proposed FrFT and notch filtering-based method is capable of providing significantly improved GNSS anti-interference performance in the interfering environments. Furthermore, the proposed GNSS anti-interference method has been tested in positioning experiments, which provides very satisfactory positioning results under interfering conditions, confirming the proposed method’s reliability and effectiveness in handling GNSS interference. |
| Databáze: |
Supplemental Index |
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