Abstract
As an indispensable part of global satellite navigation system, the frequency band of DME will overlap with that of the navigation signal, which will cause the signal from the DME platform to be accepted by the Global Navigation Satellite System receiver and form interference. Therefore, it is of great significance to study an effective algorithm to suppress DME pulse interference. This paper has the following research on this problem. In this paper, wavelet packet transform is used to solve for the suppression of DME pulse interference method, wavelet packet analysis belongs to the linear time-frequency analysis method, it has good time-frequency localization characteristics and the signal adaptive ability, due to the function of wavelet packet and parameter selection of DME will affect the ability of interference suppression, combining with the theory of wavelet threshold, function type and decomposition series are discussed to prove the validity of the selected parameters on the pulse interference suppression.
Highlights
IntroductionSatellite navigation system’s main function is to realize the positioning, velocity and timing, Global Position System is an important part of GNSS, GPS L5 signal spectrum and B2 signal common Beidou Satellite Navigation System in our country, because there have been many radio navigation systems in the work in this band, so the GPS L5 receiver is facing the complex electromagnetic envi-
Wavelet packet transform is used to solve for the suppression of DME pulse interference method, wavelet packet analysis belongs to the linear time-frequency analysis method, it has good time-frequency localization characteristics and the signal adaptive ability, due to the function of wavelet packet and parameter selection of DME will affect the ability of interference suppression, combining with the theory of wavelet threshold, function type and decomposition series are discussed to prove the validity of the selected parameters on the pulse interference suppression
This experiment is based on wavelet packet decomposition algorithm to suppress DME pulse interference
Summary
Satellite navigation system’s main function is to realize the positioning, velocity and timing, Global Position System is an important part of GNSS, GPS L5 signal spectrum and B2 signal common Beidou Satellite Navigation System in our country, because there have been many radio navigation systems in the work in this band, so the GPS L5 receiver is facing the complex electromagnetic envi-. Compared with the time-domain processing method, the frequency-domain filtering method can filter out the interference more effectively, but at the same time, there will be cases of filtering out useful signals [2]. Due to the variability of aircraft flight environment, the frequency-domain processing method based on notch filter requires the construction of different notch filters, which is not feasible in the changeable flight environment. Compared with the former two methods, the time-frequency mixing method can save more useful signals to suppress the interference. Based on the detection and suppression of DME interference in the domain of wavelet packet transform, this paper further systematically studies and analyzes the function type, decomposition order and the selection of threshold value
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