A method of sar raw data simulation based on inverse omega-k algorithm
A technology of raw data and simulation methods, applied in the direction of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc.
Active Publication Date: 2017-08-01
南京信大环境科技有限公司
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[0012] In order to solve the problems existing in the existing sea surface element simulation technology based on the SAR image domain, the purpose of the present invention is to provide a sea surface element SAR raw data simulation method based on the inverse Omega-K algorithm, which can simultaneously include various modulation effects and ocean currents sports information
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[0121] The specific implementation manner of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the content of the present invention is not limited thereto.
[0122] The overall flow chart of the sea surface element SAR raw data simulation method based on the inverse Omega-K algorithm proposed by the present invention is as follows figure 1 shown. The specific embodiment of the present invention will be further described below in conjunction with the accompanying drawings and examples (sea surface elements include ocean waves and ocean currents), but the content of the invention is not limited thereto.
[0123] 1) Calculate the height field z(x,y) of the ocean wave scene according to the following formula:
[0124]
[0125] Among them, x and y are the azimuth coordinates (parallel to the SAR flight direction) and range coordinates (perpendicular to the SAR flight direction) of the sea scene, respectively; ...
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The invention discloses a sea level essential factor SAR original data simulation method based on an inverse Omega-K algorithm, comprising steps of utilizing an inverse Omega-K algorithm to simulate a sea level scene on the basis of a complex signal two-dimension frequency domain, performing simulation on the SAR original data on the basis of the SAR complex signal two dimension frequency spectrum targeting the sea wave and the sea flow, and utilizing a batch processing simulation mode to cope with the space variance characteristic of the radial speed of the large scale sea wave track, wherein sea essential factor SAR original data obtained through simulation comprises various sea level modulations (inclination modulation, hydrodynamic force modulation, wave track radial speed modulation and speed random distribution modulation in a pixel unit) and sea flow speed information, and the SAR image can present speed beaming effect after sea surface essential factor SAR original data obtained through simulation is imaged through focusing. Compared with the two dimension time-domain sea level essential factor SAR original simulation method, the invention is easy to implement and is small in operation.
Description
technical field [0001] The invention belongs to the technical field of marine remote sensing, and in particular relates to a method for simulating raw data of sea surface element SAR based on an inverse Omega-K algorithm. Background technique [0002] Synthetic Aperture Radar (SAR), as an advanced microwave remote sensing detector (with the advantages of high resolution and not limited by meteorological conditions), has been widely used in military reconnaissance, geological surveying and mapping, and marine environment detection. In terms of marine environment detection, SAR can obtain marine environmental elements such as ocean surface current field, wind field, wave direction spectrum, ocean internal wave, front and sea ice. In addition, SAR is of great significance to the monitoring of marine targets, marine oil spill monitoring and coastal erosion monitoring. Traditional ocean monitoring methods such as shore-based observation stations, ships, and buoys have many short...
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IPC IPC(8): G01S7/40G01S13/90G01S13/88
CPCG01S7/4052G01S13/88G01S13/90G01S13/9011
Inventor 何宜军刘保昌陈忠彪张彪丘仲锋
Owner 南京信大环境科技有限公司