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Motion compensation and imaging method of medium earth orbit satellite SAR

A technology for motion compensation and orbiting satellites, which is applied in the directions of radio wave reflection/re-radiation, re-radiation, and measurement devices, which can solve problems such as position spectrum ambiguity, improve imaging quality, and overcome serious azimuth spectrum ambiguity.

Active Publication Date: 2018-01-19
XIDIAN UNIV
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Problems solved by technology

[0005] In view of the above-mentioned problems in the prior art, the present invention provides a motion compensation and imaging method for medium-orbit satellite SAR, which can solve the problem of blurred azimuth spectrum in motion compensation of MEO-SAR imaging

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  • Motion compensation and imaging method of medium earth orbit satellite SAR
  • Motion compensation and imaging method of medium earth orbit satellite SAR
  • Motion compensation and imaging method of medium earth orbit satellite SAR

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] An embodiment of the present invention provides a motion compensation and imaging method for medium-orbit satellite SAR, which mainly includes three parts:

[0043] 1. Improved two-step MOCO.

[0044] Compared with the traditional two-step MOCO, the improved two-step MOCO no longer compensates the secondary motion error, thus avoiding the ambiguity of the azimuth spectrum.

[0045] 2. ASE-Velocity model

[0046] The ASE-Velocity model is used to adapt...

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Abstract

The invention belongs to the field of radar signal processing and discloses a motion compensation and imaging method of a medium earth orbit satellite SAR. The method comprises the steps that: an MEO-SAR transmits a linear frequency modulation signal, receives a corresponding echo signal and obtains a distance frequency domain signal; a two-step motion compensation method is used to obtain a compensated echo signal; an ASE velocity model is used for carrying out modeling of the compensated echo signal again; the echo signal which is subjected to modeling again is subjected to equivalent errorcompensation; the echo signal which is subjected to the equivalent error compensation is subjected to extended Stolt interpolation based on the ASE velocity model and an SAR focused image is obtained.A problem of ambiguity of an azimuth spectrum in the motion compensation of MEO-SAR imaging can be solved.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a motion compensation and imaging method for SAR of mid-orbit satellites, which is suitable for SAR imaging of mid-orbit satellites. Background technique [0002] Synthetic aperture radar (SAR), as an advanced radar detection system, can work all-weather and all-weather, and has been widely used in many aspects such as terrain surveying and mapping, geological research, natural disaster detection, etc. received great attention. [0003] As a compromise between low-orbit satellite SAR (Low-Earth-Orbit SAR, LEO-SAR) and geosynchronous orbit satellite SAR (Geosynchronous SAR, GEO-SAR), medium-orbit satellite SAR (Medium-Earth-Orbit SAR, MEO -SAR) can achieve moderate ground coverage and revisit periods. [0004] Different from LEO-SAR, the synthetic aperture time of MEO-SAR is longer, and the curvature of its trajectory is more obvious, and the traditio...

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Application Information

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IPC IPC(8): G01S13/90
Inventor 邢孟道蓝洋陈溅来孙光才
Owner XIDIAN UNIV
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