A New GNSS Interference Detection Method Based on Rearranged Wavelet-Hough Transform.

Kewen Sun,Tengteng Zhang

doi:10.3390/s21051714

Abstract

Since radio frequency interference (RFI) seriously degrades the performance of a global navigation satellite system (GNSS) receiver, interference detection becomes very important for GNSS receivers. In this paper, a novel rearranged wavelet–Hough transform (RWHT) method is proposed in GNSS interference detection, which is obtained by the combination of rearranged wavelet transform and Hough transform (HT). The proposed RWHT method is tested for detecting sweep interference and continuous wave (CW) interference, the major types of GNSS interfering signals generated by a GNSS jammer in a controlled test bench experiment. The performance of the proposed RWHT method is compared with the conventional techniques such as Wigner–Ville distribution (WVD) and Wigner–Hough transform (WHT). The analysis results show that the proposed RWHT method reduces the influence of cross-item problem and improves the energy aggregation property in GNSS interference detection. When compared with the WHT approach, this proposed RWHT method presents about 90.3% and 30.8% performance improvement in the initial frequency and chirp rate estimation of the GNSS sweep interfering signal, respectively. These results can be further considered to be the proof of the validity and effectiveness of the developed GNSS interference detection method using RWHT.

Highlights

With the increasing global navigation satellite system (GNSS) applications in various civil and military fields, reliable navigation and positioning performance has become a key and important requirement for GNSS receivers [1,2,3,4]
The performance of GNSS interference detection based on rearranged wavelet–Hough transform was analyzed in comparison with the traditional interference detection techniques such as Wigner–Ville distribution (WVD) and Wigner–Hough transform (WHT)
A novel GNSS interference detection method based on rearranged wavelet–Hough transform has been proposed

Summary

Introduction

With the increasing global navigation satellite system (GNSS) applications in various civil and military fields, reliable navigation and positioning performance has become a key and important requirement for GNSS receivers [1,2,3,4]. The direct sequence spread spectrum (DSSS) scheme which has been used in most of the satellite navigation systems spreads the received GNSS signal power over a wider bandwidth; this ensures a dispreading gain in the GNSS receiver, which can reduce impairments caused by the undesired disturbing signals [1]. GNSS has a certain capability to be immune from interference, due to the reception of the very low GNSS signal power, intentional or unintentional radio frequency interference (RFI) can cause serious performance degradation of a GNSS receiver; for instances, RFI may cause degradation of GNSS signal quality, serious errors in navigation and timing results, and even completely loss lock of the receiver [2,3,4,5,6]. The commonly used methods in GNSS interference detection mainly include automatic gain control (AGC) method, time domain methods, and frequency domain methods. Interference detection has become a critically important role for GNSS applications [7,8,9,10,11,12,13,14,15,16].

Results

Discussion

Conclusion