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Nonlevel flight double-station SAR frequency domain FENLCS imaging method based on quadratic elliptic model

A technology of ellipse model and imaging method, which is applied in the field of signal processing, can solve problems such as the limitation of algorithm applicability, and achieve the effect of good azimuth focusing effect

Active Publication Date: 2019-12-20
HANGZHOU DIANZI UNIV
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Problems solved by technology

Most of these algorithms can only deal with the situation where the azimuth-spatial variability of the echo data is small, and the imaging resolution, imaging width, and applicability of the algorithm are greatly limited.

Method used

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  • Nonlevel flight double-station SAR frequency domain FENLCS imaging method based on quadratic elliptic model
  • Nonlevel flight double-station SAR frequency domain FENLCS imaging method based on quadratic elliptic model
  • Nonlevel flight double-station SAR frequency domain FENLCS imaging method based on quadratic elliptic model

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Embodiment

[0131] figure 2 is the beam synchronization geometric model of non-level flight dual-static SAR, where P 0 ,P 1 The two points are the imaging scene center point target and any point target respectively. The transmitter and receiver are on their respective lines at different speeds v T and v R Flying, oblique angles are θ T and azimuthal space-varying θ R (η c ). R R (η) and R T (η) are respectively the point target P 1 It crosses the time t at the center of the beam c Instantaneous slant range to receiver and transmitter.

[0132] Table 1 shows the system simulation parameters of the scene center used in this illustration example, and the range and azimuth widths of the imaging area are 1.0km and 2.0km respectively, and the theoretical resolution is 1.0m. The target P selected in this example 0 , P 1 , P 2 The positions on the ground two-dimensional coordinate system are (13056, 88575)m, (13307, 82885)m, (12789, 94217)m respectively. Among them, after the ran...

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Abstract

The invention discloses a nonlevel flight double-station SAR frequency domain FENLCS imaging method based on a quadratic elliptic model. The method comprises the following steps: firstly, performing range direction pretreatment, namely applying linear range walk correction, KT (keystone transform), bulk range cell migration correction and second range compression in a range direction; secondly, executing residual high-order range cell migration correction treatment of azimuth space variation. According to a range direction pretreatment result, the quadratic elliptic model is put forward in theinvention, and the quadratic elliptic model is used for accurately describing azimuth space variation characteristics of an equidistant point receiver squint angle and beam center slope distance. Theimproved FENLCS imaging processing method based on the quadratic elliptic model, provided by the invention, realizes removal of characteristics of space variation with azimuth positions of a residualdoppler center, doppler modulation frequency and a high-order phase coefficient, and consequently completes azimuth unified focusing treatment. Additionally, a frequency domain high-order non-space variation prefiltering method is provided, a derivation procedure of a FENLCS algorithm is simplified, and focusing quality is improved.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to an improved high-quality imaging processing work of bistatic SAR with non-parallel tracks in high-resolution imaging of bistatic synthetic aperture radar (SAR). Background technique [0002] In the field of synthetic aperture radar (SAR) imaging, bistatic SAR, in which the receiver and transmitter are placed on two mobile platforms, has the advantages of flexible configuration, good concealment, and strong anti-reconnaissance capabilities, and has received more and more attention. Among all kinds of bistatic SAR systems, airborne non-parallel trajectory bistatic SAR has shown broad application prospects in military and civilian fields, and it is an important development direction of bistatic SAR technology research. [0003] Most of the traditional bistatic SAR imaging algorithms are carried out when the flight speed and direction of the transceiver platform are small, including th...

Claims

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/9094G01S13/9017G01S13/9058
Inventor 钟华陈国瑾刘静叶宗奇赵荣华李世平王梦圆
Owner HANGZHOU DIANZI UNIV
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