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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50155

Title: OVERCOMING THE NEGATIVE FREQUENCIES - INSTANTANEOUS FREQUENCY AND AMPLITUDE ESTIMATION USING OSCULATING CIRCLE METHOD
Authors: Ming-Kuang Hsu
Jiun-Chyuan Sheu
Cesar Hsue
Contributors: 國立臺灣海洋大學:海洋環境資訊系
Keywords: Hilbert transforms
osculating circle
instantaneous frequency
unwrapped phase
Date: 2011-10
Issue Date: 2018-09-17T07:54:45Z
Publisher: Journal of Marine Science and Technology
Abstract: Abstract: There are many methods able to extract the instantaneous
frequencies from a time series for practical applications. Gabor’s
method is one of the most popular and simple methods.
For wide band time series, Gabor’s method may produce
negative frequencies. The limitation of Gabor’s method is that,
in order to avoid resulting with negative frequencies, it can
only be applied to time series with mono component and near
zero mean. In this paper, a new method that does not generate
negative frequencies, the Osculating Circle (OC) Method, is
presented. The OC method is based on Gabor’s method but
with modified unwrapped phase calculation. This new method
can provide accurate instantaneous frequency (IF) and instantaneous
amplitude (IA) calculation with only positive
frequency results. This paper is focused on overcoming the
negative frequency encountered in traditional Garbo’s method.
Although, other important topics such as the noise are not
discussed in detail in this paper
Relation: 16(5) pp.514-521
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50155
Appears in Collections:[海洋環境資訊系] 期刊論文

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