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Synthetic aperture radar imaging method and device

A technology of synthetic aperture radar and imaging method, which is applied in the field of radar, and can solve the problems of low mechanical scanning speed and difficulty in realizing sliding spotlight imaging, etc.

Inactive Publication Date: 2017-07-14
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For relatively common medium-sized and large-scale satellites, due to the large moment of inertia and low mechanical scanning speed, it is difficult to achieve sliding spotlight imaging with this method

Method used

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  • Synthetic aperture radar imaging method and device
  • Synthetic aperture radar imaging method and device

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Effect test

Embodiment 1

[0034] An embodiment of the present invention provides a synthetic aperture radar imaging method, which is applied to a synthetic aperture radar imaging device, figure 2 It is a schematic diagram of the implementation flow of a synthetic aperture radar imaging method according to an embodiment of the present invention, as figure 2 As shown, the method includes the following steps:

[0035] Step S201, determining the first angular velocity and imaging time of the SAR.

[0036] Here, the first angular velocity is the angular velocity of beam scanning in azimuth direction when the SAR performs sliding spotlight imaging.

[0037] The step S201 further includes:

[0038] Step S201a, collecting system parameters of the SAR;

[0039] Here, the system parameters of the SAR include but are not limited to: the operating speed of the SAR, the slant distance, the equivalent azimuth length of the antenna, and the azimuth beamwidth.

[0040] Step S201b, acquiring the preset imaging ar...

Embodiment 2

[0059] Based on the foregoing embodiments, an embodiment of the present invention further provides a synthetic aperture radar imaging method, which is applied to a synthetic aperture radar imaging device, and the synthetic aperture radar imaging device may be a processor in an actual implementation process. image 3 It is a schematic diagram of the implementation process of the second synthetic aperture radar imaging method of the present invention, as image 3 As shown, the method includes the following steps:

[0060] Step S301, determining the first angular velocity and imaging time of the SAR.

[0061] Here, the first angular velocity is the angular velocity of beam scanning in azimuth direction when the SAR performs sliding spotlight imaging.

[0062] The step S301 further includes:

[0063] Step S301a, collecting system parameters of the SAR;

[0064] Here, the system parameters of the SAR include but are not limited to: the operating speed of the SAR, the slant dista...

Embodiment 3

[0104] In order to better understand this embodiment, first introduce the composition and structure of the SAR satellite. Pic 4-1 It is a schematic diagram of the composition structure of the SAR satellite and the normal in-orbit flight state of the SAR satellite in Embodiment 3 of the present invention, such as Pic 4-1As shown, the SAR satellite is mainly composed of two parts: a satellite body 501 and an antenna 502 . In the normal on-orbit flight state, the SAR satellite body coordinate system is defined as: the origin of the coordinates is located at the center of mass O of the satellite; the X-axis points to the flight direction of the satellite, which is consistent with the antenna azimuth; the Z-axis is along the normal direction of the antenna array and points to the earth; The Y axis is perpendicular to the X and Z axes, which conforms to the right-hand rule. In the figure, OE points from the satellite to the center of the earth, and the angle between OE and OZ is ...

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Abstract

The invention discloses a synthetic aperture radar imaging method and device. The method comprises the steps that the first angular velocity and the imaging time of the SAR are determined, wherein the first angular velocity is the angular velocity of azimuth beam scanning when the SAR carries out sliding beaming imaging; the second angular velocity is determined according to the maximum mechanical rotation angular velocity of the SAR, wherein the second angular velocity is the angular velocity of mechanical scanning of the SAR; the third angular velocity is determined according to the first angular velocity and the second angular velocity, wherein the third angular velocity is the angular velocity of electrical scanning of the SAR; and the SAR is controlled to carry out mechanical scanning and electrical scanning according to the second angular velocity, the third angular velocity and the imaging time, so as to acquire echo data; and sliding beaming imaging is carried out based on the echo data.

Description

technical field [0001] The invention relates to the field of radar technology, in particular to a synthetic aperture radar imaging method and device. Background technique [0002] Synthetic Aperture Radar (SAR) satellites carry SAR on satellites for earth observation. Due to the use of microwave imaging technology, all-day and all-weather observations can be realized, which is an important means of earth observation. [0003] Sliding beamforming is an imaging mode of SAR satellites. This mode uses the azimuth beam to scan forward, slows down the ground movement speed of the beam footprint, and realizes high-resolution imaging. The azimuth resolution of the sliding beamforming mode is mainly determined by the scanning speed and the maximum scanning angle of the antenna azimuth beam. [0004] There are two possible implementations of azimuth beam scanning, namely electrical scanning and mechanical scanning. Both can achieve azimuth beam scanning operation, but their characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9017
Inventor 孙吉利郑明洁禹卫东
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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