Author(s)

Jian Huang, Yong Xu and Qing Chang

Corresponding Author

Jian Huang

ABSTRACT

Global navigation satellite systems (GNSSs) have been widely used in military and civil fields, and the security and application of GNSSs have been greatly weakened by various intentional and unintentional interference. An interference suppression technique based on wavelet packet transform (WPT) is proposed in this paper, which can effectively suppress interference in the same frequency band of the GNSS receiver. First, we introduce the principles and implementation of WPT. The anti-jamming performance of the proposed method is evaluated according to the carrier-to-noise ratio (CNR) at the receiving end. Additionally, the differences in the anti-jamming performance of the proposed algorithm for different types of interference are analyzed. In a case where the spread spectrum code rate is 2.046 MHz, for the pulse interference shown in Table 2, the maximum interference-to-signal ratio (ISR) that can be suppressed by the proposed method is 100 dB. For sweep interference, the maximum ISR that can be suppressed is 80 dB, and for single-tone interference, the maximum ISR that can be suppressed is 80 dB.

KEYWORDS

Global satellite navigation system, wavelet packet transform, interference suppression, adaptive algorithm