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Sea surface oil spilling detection method of complete polarization synthetic aperture radar

A technology of synthetic aperture radar and sea oil spill, applied in measuring devices, radio wave measurement systems, radio wave reflection/reradiation, etc., can solve high false alarm rate, high false alarm rate has not been completely resolved, sacrifice Problems such as detection speed, to achieve the effect of improving detection speed

Inactive Publication Date: 2011-06-15
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology

Since oil spills and suspected objects appear as shadowy features on SAR images, this method has a high false alarm rate.
When the detector is improved, such as replacing the minimum distance detector with an artificial neural network detector, although the high false alarm rate is suppressed, it is also at the expense of detection speed.
In conclusion, the problem of high false alarm rate in SAR sea oil spill detection has not been completely resolved

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  • Sea surface oil spilling detection method of complete polarization synthetic aperture radar
  • Sea surface oil spilling detection method of complete polarization synthetic aperture radar
  • Sea surface oil spilling detection method of complete polarization synthetic aperture radar

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Embodiment Construction

[0019] Now, the present invention will be described in detail in conjunction with the accompanying drawings.

[0020] A kind of full polarization synthetic aperture radar sea surface oil spill detection method of the present invention comprises the following steps:

[0021] 1. Read in the fully polarimetric SAR image, denoted as and Wherein, HH is horizontally polarized transmit and horizontally polarized receive, VV is vertically polarized transmit and vertically polarized receive, HV is horizontally polarized transmit and vertically polarized receive. The fully polarimetric SAR image is segmented using an adaptive threshold algorithm, and the fully polarimetric SAR image S after removing the sea surface is obtained. VV , S HH and S HV , the threshold T=μ+kσ, where μ is the mean value of the full-polarization SAR image, σ is the standard deviation of the full-polarization SAR image, and k is a coefficient related to the sea state.

[0022] 2. According to the prior inf...

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Abstract

The invention discloses a sea surface oil spilling detection method of a complete polarization synthetic aperture radar (SAR). The method comprises the following steps of: carrying out adaptive threshold value segmentation on a complete polarization SAR image to obtain complete polarization SAR images getting rid of the sea surface; selecting a training sample and a testing sample from the complete polarization SAR images getting rid of the sea surface; training an SVM (Support Vector Machine) detector, and normalizing polarization characteristic vectors of the detector, which comprise a scattering entropy H, a scattering angle alpha, a negative entropy A, a co-polarization ratio gamma, a cross polarization ratio eta, a depolarization ratio delta, a co-polarization phase difference phi HH-VV and a cross polarization phase difference phi HH-VV; and finally, detecting and identifying spilled oil and suspected objects by using the SVM and outputting a detection result. The method has thecharacteristics of high detection speed and low false alarm rate and is suitable for the sea surface oil spilling detection of the SAR.

Description

technical field [0001] The invention belongs to the technical field of marine remote sensing, and in particular relates to a method for detecting oil spills on a sea surface by a full-polarization synthetic aperture radar. Background technique [0002] There are two main methods of sea oil spill monitoring, direct detection and remote sensing detection. Synthetic aperture radar (SAR, synthetic aperture radar) belongs to the remote sensing detection method. Compared with the direct detection method, SAR has the following unique advantages in the monitoring of oil spills on the sea surface: 1. SAR can work at night, so it can monitor the commercial behavior of illegal / intentional / malicious oil discharge; 2. In any weather conditions 3. Using SAR images, the source of oil spills can be found, that is, the main body of the accident can be determined, and the basis for compensation can be provided. [0003] Scattering of SAR echoes by the sea is mainly contributed by short gravi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41
Inventor 杨永生张宗杰赵梅
Owner SUZHOU UNIV OF SCI & TECH
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