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A Method for Determination of Orthogonal Coded Waveform Applied to Spaceborne High Resolution and Wide Amplitude SAR

An orthogonal coding, high-resolution technology, applied in the field of synthetic aperture radar, to achieve the effect of simple imaging mode and mature imaging algorithm

Inactive Publication Date: 2017-01-25
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology

[0012] The problem solved by the technology of the present invention is to fundamentally solve the contradiction between the high resolution and wide surveying swath of the spaceborne SAR system by using the traditional imaging mode, avoid the use of complex antenna systems or complex beam control schemes, and expand the application of orthogonal coding waveforms field

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  • A Method for Determination of Orthogonal Coded Waveform Applied to Spaceborne High Resolution and Wide Amplitude SAR
  • A Method for Determination of Orthogonal Coded Waveform Applied to Spaceborne High Resolution and Wide Amplitude SAR
  • A Method for Determination of Orthogonal Coded Waveform Applied to Spaceborne High Resolution and Wide Amplitude SAR

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[0041] Based on the above parameters, the antenna size can be obtained, which is very meaningful for engineering design. The implementation method is as follows.

[0042] Such as figure 2 As shown, the orbital height of the satellite (point P) is H, the radius of the earth is R, the downward viewing angle is θ, and the length of the arc between two points AB is W r is the width, f c Indicates the carrier frequency.

[0043] combine figure 2 , let α 1 =∠POA,α 2 =∠POB, θ 1 =∠OPA, θ 2 =∠OPB, beamwidth According to the geometric relationship,

[0044] W r =R(α 2 -α 1 ) (1)

[0045] α = arcsin ( R + H R sin θ ) - θ - - - ( 2 )

[0046] According to formulas (1) and (2), we have

[0047]

[0048] According to the characteristics of the antenn...

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Abstract

The invention provides a quadrature encoding waveform determination method applied to a satellite-borne high-resolution wide-width SAR. First, preset input parameters are determined according to user requirements and constraint conditions of the satellite-borne high-resolution wide-width SAR; second, the Doppler tolerance fD of a transmitted waveform of the satellite-borne high-resolution wide-width SAR is determined; third, linear frequency modulation signal bandwidth BL of a quadrature encoding waveform and bandwidth BP and code length N of binary phase codes are determined through the Doppler tolerance fD, range resolution Rho r and pulse width T; fourth, the encoding group number M and system pulse repetition frequency (PRF) are determined according to azimuth resolution Rhoa and a satellite-borne striped SAR wave potential design formula; finally, the quadrature encoding waveform is designed according to the conditions obtained in the previous steps. When the quadrature encoding waveform determination method is adopted for realizing the satellite-borne high-resolution wide-width SAR, complexity of a system or complexity of an imaging method is not increased, and the requirement for system hardware is low; the image mode is simple, the imaging algorithm is mature, and large images of continuous scenes can be obtained; a novel SAR system wave potential design effort is created.

Description

technical field [0001] The present invention relates to a waveform design method for space-borne high-resolution wide-range SAR (Synthetic Aperture Radar), in particular to a method for determining orthogonally coded waveforms applied to space-borne high-resolution wide-range SAR, belonging to Synthetic aperture radar technology field. Background technique [0002] Space-borne high-resolution wide-format SAR has broad prospects in military and civil applications such as terrain mapping, battlefield reconnaissance, and target search. However, due to the contradiction between the pulse repetition frequency, the unambiguous range and the high resolution in the azimuth direction, there is still no effective and direct solution. In order to achieve high-resolution wide-format imaging, indirect solutions based on several technical approaches have been proposed at home and abroad. The technical approaches mainly include: based on DBF (Digital Beam Forming, digital beam forming), ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9011G01S13/904
Inventor 刘波张润宁薛明向雪霜尹建凤刘海涛
Owner CHINA ACADEMY OF SPACE TECHNOLOGY
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