A new modulation transfer function for ocean wave spectra retrieval from X-band marine radar imagery

Zhongbiao Chen; Biao Zhang; Yijun He; Zhongfeng Qiu; William Perrie

doi:10.1007/s00343-015-4147-1

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A new modulation transfer function for ocean wave spectra retrieval from X-band marine radar imagery

Updated：2023-05-16

- A new modulation transfer function for ocean wave spectra retrieval from X-band marine radar imagery
- Journal of Oceanology and Limnology Vol. 33, Issue 5, Pages: 1132-1141(2015)
- Affiliations：
  
  1. Nanjing University of Information Science and Technology
  2. Bedford Institute of Oceanography
- Author bio：
- Funds：
- DOI：10.1007/s00343-015-4147-1
  CLC：
- Online First：30 January 2015，
  
  Published：2015
- Accepted：
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Chen, Z., Zhang, B., He, Y. et al. A new modulation transfer function for ocean wave spectra retrieval from X-band marine radar imagery., Chin. J. Ocean. Limnol. 33, 1132–1141 (2015). https://doi.org/10.1007/s00343-015-4147-1
DOI：

Chen, Z., Zhang, B., He, Y. et al. A new modulation transfer function for ocean wave spectra retrieval from X-band marine radar imagery., Chin. J. Ocean. Limnol. 33, 1132–1141 (2015). https://doi.org/10.1007/s00343-015-4147-1 DOI：

摘要

Abstract

When imaging ocean surface waves by X-band marine radar

the radar backscatter from the sea surface is modulated by the long surface gravity waves. The modulation transfer function (MTF) comprises tilt

hydrodynamic

and shadowing modulations. A conventional linear MTF was derived using HH-polarized radar observations under conditions of deep water. In this study

we propose a new quadratic polynomial MTF based on VV-polarized radar measurements taken from heterogeneous nearshore wave fields. This new MTF is obtained using a radar-observed image spectrum and in situ buoy-measured wave frequency spectrum. We validate the MTF by comparing peak and mean wave periods retrieved from X-band marine radar image sequences with those measured by the buoy. It is shown that the retrieval accuracies of peak and mean wave periods of the new MTF are better than the conventional MTF. The results also show that the bias and root mean square errors of the peak and mean wave periods of the new MTF are 0.05 and 0.88 s

and 0.32 and 0.53 s

respectively

while those of the conventional MTF are 0.61 and 0.98 s

and 1.39 and 1.48 s

respectively. Moreover

it is also shown that the retrieval results are insensitive to the coefficients in the proposed MTF.

关键词

Keywords

references

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