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Wave number domain ArcSAR imaging method based on triangular sine equivalent resident phase point solving

An imaging method and phase point technology, applied in the radio wave measurement system, radio wave reflection/re-radiation, using re-radiation, etc., can solve the problem of not being able to explicitly derive the wave number domain expression and not finding the wave number domain phase compensation method and other issues to achieve the effect of small residual error

Pending Publication Date: 2021-11-05
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The published OmegaKA algorithm uses approximate processing in the process of deriving the two-dimensional frequency domain expression. The main difficulty is that there is a trigonometric function about the rotation angle in the target slant range, and it is impossible to explicitly derive the wavenumber domain expression. Can find effective wavenumber domain phase compensation method

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  • Wave number domain ArcSAR imaging method based on triangular sine equivalent resident phase point solving
  • Wave number domain ArcSAR imaging method based on triangular sine equivalent resident phase point solving
  • Wave number domain ArcSAR imaging method based on triangular sine equivalent resident phase point solving

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Embodiment Construction

[0068] The present invention will be described in further detail below in conjunction with the accompanying drawings, but it is not intended to limit the present invention.

[0069] refer to figure 1 as shown, figure 1 It is a schematic diagram of the scanning geometry of the ArcSAR system in the embodiment of the present invention. Among them, s represents the radar position, p represents the target position, and R represents the distance from the target to the radar. The radar moves in a circle with point o as the center, and the length of the rotating arm is r so , the distance from the target to point o is r po ,θ p is the angle between op and ox.

[0070] figure 2 It is a flow chart of the wavenumber domain imaging method based on triangular sine equivalent dwell phase point solution in the embodiment of the present invention. First, in the case of not approximating the target slant distance, the principle of stationary phase uses the sine theorem to carry out imp...

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Abstract

The invention belongs to the technical field of radar imaging, and discloses a wave number domain ArcSAR imaging method based on triangular sine equivalent resident phase point solving, which comprises the steps of under the condition of not approximating a target slant distance, performing implicit replacement on echo data by using a resident phase principle, and calculating and deducing a complete expression of an echo signal phase in a wavenumber domain; according to the complete expression, constructing a compensation function to realize phase error compensation; and obtaining a polar coordinate focusing result through inverse Fourier transform in a rotation angle direction, and obtaining a two-dimensional space coordinate result through interpolation of polar coordinates to rectangular coordinates. The imaging method disclosed by the invention has the advantages of small residual error theoretically, suitability for near-distance and long-distance target imaging and high imaging precision, the algorithm time efficiency is close to the RDA, and both the imaging precision and the time efficiency are considered.

Description

technical field [0001] The invention belongs to the field of ground-based circular-arc orbital scanning synthetic aperture radar with large field of view observation capability, and in particular relates to a wavenumber domain ArcSAR imaging method based on triangular sinusoidal equivalent dwell phase point solution. Background technique [0002] GB-SAR adopts the principle of synthetic aperture radar imaging, and its system platform is placed statically on the ground, which can actively transmit radar signals to the observed area and receive them. Using the received echo signals, scene imaging within a range of several kilometers can usually be realized. . GB-SAR system is divided into two categories: linear track system and arc track system. The GB-SAR system based on arc orbit is called ArcSAR. [0003] The published ArcSAR imaging algorithms can be divided into three categories. The first type is the Back Projection (BPA) algorithm, the basic principle of which is to ...

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Application Information

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IPC IPC(8): G01S13/90
CPCG01S13/9056G01S13/9004G01S13/9019
Inventor 张远贾林靖赵灵然
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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