FM Interference Suppression for GPS Receivers via Hilbert-Huang Transform Approach
Date Issued
2007
Date
2007
Author(s)
Chen, Wei-Yu
DOI
zh-TW
Abstract
The global position system (GPS) can provide accurate positioning and timing information in many applications. GPS can cope with wideband noise (such as thermal noise and channel noise) or low power narrowband interference with the processing gain of spreading code. However, GPS cannot reject high power interference completely. Therefore, interference suppression research of GPS receiver has become an important issue.
In this thesis, we consider interference source as frequency modulation interference. Because frequency modulation interference is time-varying interference signal, we apply time-frequency analysis to detect characteristics of interference. The ways to analyze time-frequency include Short Time Fourier Transform (STFT), Gabor Transform, Wigner Distribution, and Hilbert-Huang Transform (HHT). Because Hilbert-Huang Transform has the best time-frequency resolution, we use HHT to simulate the performance of frequency modulation interference suppression. It is based on the empirical mode decomposition (EMD), which generates a set of intrinsic mode functions (IMF). We take the IMF which has the biggest energy as interference and remove it.
Then, we use sinusoidal frequency modulation interference and linear frequency modulation interference to perform interference suppression test. Through software simulation, under HHT frame we can get excellent interference suppression result for narrowband frequency modulation interference and can detect interference characteristics for wideband frequency modulation interference. Compare to the previous research, the interference suppression ability in this research is superior.
Subjects
希爾伯特-黃轉換、干擾抑制、時頻分析、調頻訊號、GPS接收機
Hilbert-Huang Transform, Interference Suppression, Time-Frequency Analysis, Frequency Modulation Signal, GPS Receiver
Type
thesis
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