Nonlinear influences on ocean waves observed by X-band radar

Li Chung Wu, Dong-Jiing Doong, Beng Chun Lee, Zsu-Hsin Chuang, Chia Chuen Kao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The purpose of this study is to discuss the influence of signal nonlinearity upon X-band radar observations. A method for estimating the degree of nonlinearity by bispectral analysis was applied and discussed. We found that bispectral analyses from spatial radar backscatter series are similar to results obtained from water level time series. In addition, the average nonlinear degree from radar backscatter is related to wind speed. The accuracy of wave observations derived by consideration of the nonlinear effect from radar backscatter was also investigated. The estimated error in wave height from the radar data is also related to the degree of nonlinearity. In order to improve accuracy, the modulation transfer function method was applied in order to eliminate the influence of nonlinearity.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalMarine Geophysical Research
Volume29
Issue number1
DOIs
Publication statusPublished - 2008 Jan 1

Fingerprint

ocean wave
Water waves
superhigh frequencies
radar
oceans
Radar
nonlinearity
backscatter
radar tracking
radar data
modulation transfer function
Optical transfer function
wave height
Water levels
estimating
transfer function
Time series
water level
wind velocity
time series

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Geophysics
  • Geochemistry and Petrology

Cite this

Wu, Li Chung ; Doong, Dong-Jiing ; Lee, Beng Chun ; Chuang, Zsu-Hsin ; Kao, Chia Chuen. / Nonlinear influences on ocean waves observed by X-band radar. In: Marine Geophysical Research. 2008 ; Vol. 29, No. 1. pp. 43-50.
@article{1458ef9e1ddc485f849c8a8cefab5ebd,
title = "Nonlinear influences on ocean waves observed by X-band radar",
abstract = "The purpose of this study is to discuss the influence of signal nonlinearity upon X-band radar observations. A method for estimating the degree of nonlinearity by bispectral analysis was applied and discussed. We found that bispectral analyses from spatial radar backscatter series are similar to results obtained from water level time series. In addition, the average nonlinear degree from radar backscatter is related to wind speed. The accuracy of wave observations derived by consideration of the nonlinear effect from radar backscatter was also investigated. The estimated error in wave height from the radar data is also related to the degree of nonlinearity. In order to improve accuracy, the modulation transfer function method was applied in order to eliminate the influence of nonlinearity.",
author = "Wu, {Li Chung} and Dong-Jiing Doong and Lee, {Beng Chun} and Zsu-Hsin Chuang and Kao, {Chia Chuen}",
year = "2008",
month = "1",
day = "1",
doi = "10.1007/s11001-008-9044-y",
language = "English",
volume = "29",
pages = "43--50",
journal = "Marine Geophysical Researches",
issn = "0025-3235",
publisher = "Springer Netherlands",
number = "1",

}

Nonlinear influences on ocean waves observed by X-band radar. / Wu, Li Chung; Doong, Dong-Jiing; Lee, Beng Chun; Chuang, Zsu-Hsin; Kao, Chia Chuen.

In: Marine Geophysical Research, Vol. 29, No. 1, 01.01.2008, p. 43-50.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Nonlinear influences on ocean waves observed by X-band radar

AU - Wu, Li Chung

AU - Doong, Dong-Jiing

AU - Lee, Beng Chun

AU - Chuang, Zsu-Hsin

AU - Kao, Chia Chuen

PY - 2008/1/1

Y1 - 2008/1/1

N2 - The purpose of this study is to discuss the influence of signal nonlinearity upon X-band radar observations. A method for estimating the degree of nonlinearity by bispectral analysis was applied and discussed. We found that bispectral analyses from spatial radar backscatter series are similar to results obtained from water level time series. In addition, the average nonlinear degree from radar backscatter is related to wind speed. The accuracy of wave observations derived by consideration of the nonlinear effect from radar backscatter was also investigated. The estimated error in wave height from the radar data is also related to the degree of nonlinearity. In order to improve accuracy, the modulation transfer function method was applied in order to eliminate the influence of nonlinearity.

AB - The purpose of this study is to discuss the influence of signal nonlinearity upon X-band radar observations. A method for estimating the degree of nonlinearity by bispectral analysis was applied and discussed. We found that bispectral analyses from spatial radar backscatter series are similar to results obtained from water level time series. In addition, the average nonlinear degree from radar backscatter is related to wind speed. The accuracy of wave observations derived by consideration of the nonlinear effect from radar backscatter was also investigated. The estimated error in wave height from the radar data is also related to the degree of nonlinearity. In order to improve accuracy, the modulation transfer function method was applied in order to eliminate the influence of nonlinearity.

UR - http://www.scopus.com/inward/record.url?scp=44249128604&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=44249128604&partnerID=8YFLogxK

U2 - 10.1007/s11001-008-9044-y

DO - 10.1007/s11001-008-9044-y

M3 - Article

VL - 29

SP - 43

EP - 50

JO - Marine Geophysical Researches

JF - Marine Geophysical Researches

SN - 0025-3235

IS - 1

ER -