Simulation method of bistatic synthetic aperture radar sea wave direction spectrum

A technology of synthetic aperture radar and simulation method, which is applied in the direction of radio wave reflection/re-radiation, special data processing application, and utilization of re-radiation, etc. It can solve the problem of low computing efficiency and achieve the effect of high computing efficiency

Inactive Publication Date: 2010-04-21
西安华瑞恒泰信息技术有限公司
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Problems solved by technology

Since this method needs to simulate echo signals in the time domain, the calculation efficiency of this method is low, and the accuracy of this method is also closely related to the selection of the sea surface electromagnetic scattering model

Method used

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  • Simulation method of bistatic synthetic aperture radar sea wave direction spectrum
  • Simulation method of bistatic synthetic aperture radar sea wave direction spectrum
  • Simulation method of bistatic synthetic aperture radar sea wave direction spectrum

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Embodiment

[0040] On the Matlab platform, it has been simulated and verified. Before explaining the specific implementation steps, the wave parameters and BiSAR system parameters are given first. The sea surface wind speed is 7m / s, the wave wavelength is 100m, the scale coefficient α is 0.0081, and the peak rise factor γ is 1. The synthetic aperture time is 2.5s, the radar wavelength is 0.24m, the incident angle of the transmitter is 45°, the incident angle of the receiver is 30°, the shortest distance between the transmitter and the wave center is 10km, and the shortest distance between the receiver and the wave center is 8km , the speed of the transmitter is 220m / s, and the speed of the receiver is 200m / s. The transmitter and the receiver are flying in the same direction and in parallel, and the propagation direction of the ocean wave is consistent with the flight direction of the receiving / transmitting platform.

[0041] Step 1. Calculate the JONSWAP wave spectrum according to the w...

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Abstract

The invention discloses a simulation method of a bistatic synthetic aperture radar sea wave direction spectrum, which comprises the following steps of calculating a JONSWAP sea wave spectrum and a sea wave vertical displacement according to sea wave parameters; obtaining BiSAR echo signals comprising sea wave orbital velocity and accelerated velocity according to a radar wave modulation principle and BiSAR system parameters; carrying the matched filtering on the echo signals according to a BiSAR distance and Doppler imaging algorithm to obtain an analysis formula of a BiSAR sea wave image; working out the BiSAR sea wave image by adopting a numerical integration method; and at last, carrying out two-dimensional FFT operation on the BiSAR sea wave image to obtain the BiSAR sea wave direction spectrum. The BiSAR sea wave image can be worked out by adopting the numerical integration method without producing the echo signals and processing the image in a time domain, therefore, the invention has higher operation efficiency.

Description

technical field [0001] The invention relates to a method for simulating the wave direction spectrum of a dual-station synthetic aperture radar, and belongs to the technical field of the method for simulating the wave direction spectrum in ocean remote sensing technology. Background technique [0002] Synthetic aperture radar (SAR, synthetic aperture radar) has been developed rapidly as an all-weather, all-weather and high-resolution microwave remote sensing technology, and has become a powerful tool for monitoring the marine environment, conducting ocean dynamics research and ensuring maritime traffic safety. tool. Compared with conventional marine survey methods, SAR ocean remote sensing has the following unique advantages: (1) It can observe the ocean all-weather and all-weather, and it is not limited by the surface, sea surface, weather and human conditions; (2) Large-scale and periodic monitoring of ocean dynamics, such as ocean waves, internal waves, seabed topography,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S7/41G06F17/50
Inventor 杨永红张尤赛林明陆南
Owner 西安华瑞恒泰信息技术有限公司
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