Wave parameter inversion method utilizing high-resolution satellite optical image

Abstract

The invention relates to a wave parameter inversion method utilizing a high-resolution satellite optical image, and belongs to the technical field of ocean wave parameter extraction. The method comprises the following steps: step 1, preprocessing an original optical image; step 2, acquiring a gray value above the sea; step 3, segmenting an image window; step 4, image feature enhancement and recognition; step 5, acquiring an energy spectrum; step 6, acquiring a sea wave propagation direction; step 7, obtaining a radial wave number spectrum; step 8, acquiring a main wave length lambda; step 9, calculating a main wave frequency f and a period T; and step 10, obtaining sea wave information: carrying out window sliding to obtain sea wave propagation directions, wavelengths and periods of othersub-windows so as to obtain sea wave information of any area in a satellite observation range. According to the method, a two-dimensional Fourier window segmentation sliding technology is used so thathuman intervention calculation can be avoided, an accurate wave direction is obtained, and information such as wavelength and period can be further obtained.

Description

technical field [0001] The invention relates to a wave parameter inversion method using high-resolution satellite optical images, and belongs to the technical field of ocean wave parameter extraction. Background technique [0002] Ocean wave information is an important part of marine operational observations. Currently, my country’s ocean observations are mainly carried out through moored wave buoys, which can provide information such as wave cycle, wave direction, and wave height once an hour. In addition, shore-based X-band measurements Wave radar can observe two-dimensional coastal wave information, but the observation cost is high, and it does not have the potential for large-scale promotion. The microwave scatterometer carried by satellites can also observe the sea surface wave height, but the resolution is low. Coastal areas often Susceptible to terrestrial signal interference. The applicant is known to use satellite remote sensing images such as Ziyuan No. 3 to retriev...

AI Technical Summary

Problems solved by technology

[0002]Ocean wave information is an important part of ocean operational observation. Now our country’s ocean observation is mainly carried out through moored wave buoys, which can provide hourly waves In addition, the shore-based X-band wave measuring radar can observe two-dimensional offshore wave information, but the observation cost is relatively high, and it does not yet have the potential for large-scale promotion. The microwave scatterometer carried by the satellite is also It can observe the sea surface wave height, but the resolution is low, and coastal areas are often susceptible to land signal interference

The applicant is known to use satellite remote sensing images such as Ziyuan No. 3 to retrieve ocean wave information, but human intervention is required to calculate the initial data when calculating the wave direction. That is to say, the visual direction determines the calculation of the wave direction, so the calculation of the wave direction is not correct accurate

However, the main shortcomings of the existing technology are: 1) buoy fixed-point observation belongs to the time domain measurement, which cannot realize the extraction of ocean wave information in the space domain; 2) the inversion accuracy of ocean waves under small wind and waves is low; 3) the cost of shore-based wave measuring radar High; 4) Satellite microwave sensor resolution is low

Images