|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Hankel Spectrum Analysis: A novel signal decomposition method and its geophysical applications | | Kunpeng Shi
; Hao Ding
; | | Date: |
9 Jun 2022 | | Abstract: | To analyze non-stationary harmonic signals typically contained in geophysical
observables is a quest that has seen continual advances in numerical techniques
over the decades. In this paper, based on transient z-pole estimation (in
Hankel matrices), a novel state-space analysis referred to as Hankel Spectral
Analysis (HSA), was developed. Depended on the Hankel total least square
(HTLS), the HSA incorporates truncated singular value decomposition (TSVD) and
its shift-invariant property in robustly decomposing the closely-spaced
sinusoids. Resorted to a sliding window processing, HSA can be used to analyze
non-stationary sequential structures, in the support of consecutive quaternary
parameters {Ai, {alpha}i, fi, { heta}i}. Based on a series of experiments
with special features commonly in real measurements, the availabilities of HSA
in complex harmonic constituents (e.g., the time-variant amplitude/frequency,
mutation, the episodic recording signals) with low Signal-to-Noise Ratio are
confirmed. In real applications, we use HSA to analyze both global geophysical
observables, including polar motion (PM) and earth’s dynamic oblateness
({Delta}J2), and some new findings are obtained. In the PM series since the
1900s, a total of triple jumps from Chandler wobble (CW) are firstly confirmed;
and all of them are synchronized by the sharp decrease of Chandler intensity
and period. In the {Delta}J2 series, two decadal signals (18.6 yr, 10.5 yr)
are identified to be associated with the tide effect, and solar activity; and
its interannual-to-decadal oscillations contribute to multiple global gravity
anomalies. These findings implied the great potential of the HSA in searching
hitherto signals of geophysical observations. | | Source: | arXiv, 2206.04519 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER