Motion error compensation method of synthetic aperture radar

A technology of synthetic aperture radar and motion error, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve the problem that the compensation accuracy cannot meet the demand, and achieve the effect of improving reliability

Active Publication Date: 2020-08-18
BEIJING INST OF RADIO MEASUREMENT
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Problems solved by technology

[0003] However, in the case of high resolution, since the influence of range motion error along the space variation of the range gat

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  • Motion error compensation method of synthetic aperture radar
  • Motion error compensation method of synthetic aperture radar
  • Motion error compensation method of synthetic aperture radar

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[0021] The principles and features of the present invention will be described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0022] Such as figure 1 As shown, the schematic flow chart provided for the embodiment of the motion error compensation method of the present invention, the motion error compensation method is suitable for synthetic aperture radar, especially the compensation of space variation of range motion error envelope in airborne synthetic aperture radar imaging, including:

[0023] S1. Obtain the working parameters of the radar, and establish a distance error model according to the working parameters.

[0024] It should be noted that the operating parameters of the radar may include the slant distance corresponding to the range gate, the flight altitude of the radar, the displacement of the radar on the horizontal plane ...

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Abstract

The invention discloses a motion error compensation method of a synthetic aperture radar, and relates to the field of synthetic aperture radars. According to the method, a distance error model is established to obtain a distance error varying along with a distance gate space, then the scene center distance is used as a reference, primary compensation of the distance error is carried out, envelopeand phase errors can be compensated at the same time, and only the space-variant envelope and phase errors are left after compensation; then, secondary compensation is carried out, the secondary compensation is carried out in a distance time domain, a space-variant phase error is compensated, and an envelope space-variant error is left after the secondary compensation; and finally, the echo signalsubjected to secondary compensation is segmented in a distance time domain, a compensation function is constructed according to the center distance in each small section, envelope space-variant errors are compensated, after compensation is completed, echo signals of all the small sections are spliced again, signals with envelope space-variant error compensation completed are obtained, the problemthat a traditional motion error compensation method cannot compensate the envelope space-variant errors is solved, and the compensation reliability is improved.

Description

technical field [0001] The invention relates to the field of synthetic aperture radar, in particular to a motion error compensation method of synthetic aperture radar. Background technique [0002] In SAR (Synthetic Aperture Radar, synthetic aperture radar) imaging, motion error compensation is closely related to imaging quality, and motion error compensation is divided into range motion error compensation and azimuth motion error compensation. For range motion error compensation, the current commonly used method is a two-step compensation method, in which the first step compensates the magnitude and phase errors of the scene center, and the second step compensates the phase error of the range space. [0003] However, in the case of high resolution, the compensation accuracy of the traditional two-step compensation method cannot meet the requirements because the influence of the range motion error along the space variation of the range gate on the envelope cannot be ignored....

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/90G01S13/9094G01S7/418G01S13/9019
Inventor 邢涛冯亮马春铭李爽
Owner BEIJING INST OF RADIO MEASUREMENT
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