Quadrature encoding waveform determination method applied to satellite-borne high-resolution wide-width 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: 2014-12-24
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 SA

Method used

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  • Quadrature encoding waveform determination method applied to satellite-borne high-resolution wide-width SAR
  • Quadrature encoding waveform determination method applied to satellite-borne high-resolution wide-width SAR
  • Quadrature encoding waveform determination method applied to satellite-borne high-resolution wide-width SAR

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Embodiment approach

[0041] Based on some of 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 orbit height of the satellite (point P) is H, the radius of the earth is R, the downward viewing angle is θ, and the arc length between two points AB is W r Is the width, f c Represents the carrier frequency.

[0043] Combine figure 2 , Let α 1 =∠POA,α 2 =∠POB, θ 1 =∠OPA,θ 2 =∠OPB, beam width 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 equations (1) and (2), there are

[0047]

[0048] According to the antenna characteristics, the antenna distance to the width D r It can be expressed as

[0049]

[0050] In the formula, c represents the speed of light.

[0051] The antenna distance width can be obtained by...

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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 invention relates to a method for designing the waveform of a spaceborne high-resolution wide-amplitude SAR (Synthetic Aperture Radar), in particular to a method for determining an orthogonal coding waveform applied to a space-borne high-resolution wide-amplitude SAR, belonging to Synthetic aperture radar technology field. Background technique [0002] Spaceborne high-resolution wide-range SAR has broad prospects in military and civilian applications such as terrain mapping, battlefield reconnaissance, and target search. However, due to the contradiction between the pulse repetition frequency and the wide unambiguity distance and the high resolution in the azimuth direction, there is still no effective direct solution. In order to achieve high-resolution and wide-format imaging, indirect solutions based on several technical approaches have been proposed at home and abroad. The main technical approaches include: DBF (Digital Beam Forming), DPCA (Displa...

Claims

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Application Information

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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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