Two Applications of Instantaneous Frequency to Signal Analysis and Estimation
Date Issued
2005
Date
2005
Author(s)
Ma, Wann-Jiun
DOI
en-US
Abstract
This thesis deals with two applications of instantaneous frequency to signal analysis and estimation. The first application is the analysis of aircraft longitudinal long-period oscillation named phugoid phenomenon. A Hilbert-Huang Transform (HHT) is proposed here to analyze the physical measurements in time domain. It is based on the empirical mode decomposition (EMD), which generate a set of intrinsic mode functions (IMF). The HHT is applicable to non-stationary and nonlinear data analysis, and finding out the instantaneous characteristics including frequency of the data is its main part. Besides, combining Fast Fourier Transform (FFT) with EMD shows the different results with HHT. In the phugoid analysis, we present the comparison between the non-stationary signal analysis, HHT, and the conventional Fourier based method from the real-time flight test data measured by kinematic GPS.
In the second part of this thesis, an application of adaptive all-pass based notch filter (ANFA) with Gaussian-Newton adaptive algorithm in a GPS narrowband anti-jamming system was presented. In the simulations, there are several stationary and non-stationary interferences considered. The ANFA can estimate the instantaneous frequency of the jamming in real-time, and it achieves a better performance than the conventional time-domain adaptive predictors in terms of mean squared prediction error (MSPE) and signal-to-noise ratio (SNR) improvement.
Subjects
瞬時頻率
希爾伯特-黃轉換
經驗模態分解
本質模態函數
復古
全球定位系統
適應性全通帶式凹谷濾波器
抗窄頻干擾
instantaneous frequency
Hilbert-Huang Transform
empirical mode decomposition
intrinsic mode functions
phugoid
global position system
adaptive all-pass based notch filter
Gaussian-Newton algorithm
narrowband anti-jamming
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-94-R91921118-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):228629d9766228d8010e9645250064ba