Two-dimensional distributed multi-phase screen generation method for ionospheric scintillation phase of geoSAR
A multi-phase screen and two-dimensional distribution technology, which is applied in radio wave measurement system, radio wave reflection/re-radiation, utilization of re-radiation, etc., can solve the lack of application, applicability and lack of two-dimensional phase space distribution of GEOSAR system Generation methods and other issues, to achieve the effect of facilitating the research of compensation methods
Active Publication Date: 2017-10-20
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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At present, the multi-phase screen method is mostly used in the research on ionospheric scintillation, but this method has two shortcomings in the field of GEO SAR: First, the current multi-phase screen method is mostly used in the LEO SAR system. For the GEO SAR system There is a lack of corresponding applications; second, most of the current multi-phase screen methods involve one-dimensional phase generation and many literatures have detailed descriptions of the generation methods, that is, the phase fluctuation distribution in the synthetic aperture radar imaging process is a one-dimensional spatial distribution, and there is a lack of relative Mature two-dimensional phase space distribution generation method
In fact, the spatial scene distribution in the SAR imaging process often involves multiple targets, and the original one-dimensional scintillation phase distribution assumption is not applicable, so the generation method of the two-dimensional ionospheric scintillation phase screen has become an urgent problem to be solved
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[0090] In this example, the relevant parameters are as follows:
[0091] The internal dimension r of the irregular body 0 =15m, external dimension L 0 =2.5km, the spectral index of ionospheric irregularities p=4; the horizontal size range L of the ionospheric phase screen M =500km, L N =500km; the number of horizontal distance samples is M=1024 and N=1024 respectively; the electron density fluctuation is σ ξ =0.05; where the sampling interval of the vertical height is Δz=5km, using the IRI2001 software, the background ionospheric electron density at a height of 50km-500km (the region with obvious ionospheric scintillation activities) was generated. We substitute the relevant parameters into (1)(2)(3)(4)(5) to obtain the simulation results of the phase fluctuation of the two-dimensional multi-phase screen as follows: Figure 4 shown.
[0092] image 3 shows the phase generation results of the traditional one-dimensional multi-phase screen, Figure 4 What is displayed is ...
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The invention provides a method for generating a two-dimensional distribution multiphase screen of a geostationary orbit synthetic aperture radar. With power spectrum inversion and split-step Fourier transform, the method may achieve distribution generation of ionosphere scintillation two-dimensional random fluctuation phases, resolves a core problem of an ionosphere scintillation effect simulation in large-scale scene imaging simulation of the geostationary orbit synthetic aperture radar, namely a problem of a generating method of scintillation phase two-dimensional distribution, and achieves analogue simulation of the influence of ionosphere scintillation on GEO SAR large-scale scene imaging in order to facilitate compensation method research in ionosphere scintillation effect in the future.
Description
technical field [0001] The invention belongs to the research fields of synthetic aperture radar and ionospheric scintillation, and in particular relates to a method for generating a two-dimensional distribution multi-phase screen of synchronous orbit synthetic aperture radar. Background technique [0002] Synthetic Aperture Radar (SAR) is an all-weather, all-time high-resolution microwave remote sensing imaging radar that can be installed on aircraft, satellites, missiles and other flying platforms. Since its invention in the 1950s, it has been widely used in many fields, such as disaster control, vegetation analysis, microwave remote sensing and other fields. [0003] Geosynchronous Orbit Synthetic Aperture Radar (GEO SAR) is a SAR satellite operating on a geosynchronous elliptical orbit at a height of 36000km. Compared with low-orbit SAR (LEO SAR, the orbit height is less than 1000Km), GEO SAR has many obvious advantages, mainly reflected in the long surveying and mapping...
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IPC IPC(8): G01S13/90G01S7/38
CPCG01S7/02G01S7/41G01S13/904
Inventor 胡程曾涛朱俊杰李延龙腾丁泽刚
Owner BEIJING INSTITUTE OF TECHNOLOGYGY