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MIMO-SAR three-dimensional imaging self-focusing method

A MIMO-SAR, three-dimensional imaging technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc. Adapt to problems such as 3D image self-focusing to achieve the effect of solving 3D space changes

Pending Publication Date: 2021-11-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, in reality, the scene objects are all three-dimensional objects with obvious three-dimensional structure, and the self-focusing of two-dimensional SAR cannot perceive the space-varying motion error of the third dimension, so the self-focusing of three-dimensional images cannot be realized
Some 3D autofocus algorithms currently proposed do not consider the 3D space-varying motion error caused by wide beams (Fletcher I, Watts C, Miller E, et al.Minimum entropyautofocus for 3D SAR images from a UAV platform[C] / / 2016 IEEE RadarConference.IEEE,2016.), unable to adapt to self-focusing of LA-MIMO-SAR 3D images
[0005] In summary, there is currently no effective 3D self-focusing method for unmanned platform LA-MIMO-SAR

Method used

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Embodiment 1

[0088] The proposed technology is used to process unmanned vehicle LA-MIMO-SAR simulation data to further prove the feasibility and effectiveness of the proposed technology. The unmanned vehicle LA-MIMO-SAR simulation parameters are shown in Table 1. Add random 3D translation and time-varying attitude error, and compare the 3D focusing effect before and after self-focusing using the proposed method.

[0089] Table 1 Unmanned vehicle LA-MIMO-SAR simulation parameters

[0090] parameter / unit value Working frequency Ku Synthetic distance bandwidth / GHz 1 Action distance / m 60～200 Average speed / m / s 0.6 Beamwidth / ° 60 Number of channels (transmit / receive) 16 / 16 Array length / m 1.2

[0091] Figure 4 It is the point cloud image of the 3D imaging result. It can be seen from the image that the three-dimensional imaging based on the ideal flight track is seriously defocused (see Figure 4 (a)); Based on the proposed method for...

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Abstract

The invention discloses an MIMO-SAR three-dimensional imaging self-focusing method based on motion parameter estimation. The method comprises: selecting a feature region based on a coarse imaging result, and carrying out two-dimensional spectrum analysis on a local feature region; obtaining a local space-invariant two-dimensional slope distance error through contrast ratio optimal estimation; and solving translation and attitude errors of MIMO-SAR through a motion error transfer model and a least square method, so that three-dimensional imaging self-focusing is realized. By using the method, MIMO-SAR self-focusing three-dimensional imaging can be realized under the condition that navigation precision cannot meet the imaging requirement due to no high-precision navigation information or relatively high working frequency band, and a well-focused three-dimensional radar image is obtained.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, in particular to a three-dimensional imaging self-focusing method of an unmanned platform linear array multiple-input multiple-output synthetic aperture radar (MIMO-SAR). Background technique [0002] Unmanned platform MIMO-SAR is a technology that uses unmanned platforms (such as unmanned aerial vehicles, unmanned vehicles) to perform synthetic aperture 3D imaging. It can observe the earth all-weather and all-weather, and obtain high-resolution 3D radar images of the target area. , Widely used in terrain exploration and battlefield reconnaissance and other fields. Compared with single-channel SAR two-dimensional imaging technology, MIMO-SAR three-dimensional imaging can realize three-dimensional image acquisition, and can image the imaging blind areas (downward-looking and forward-looking areas) in two-dimensional imaging. Compared with multi-pass tomographic SAR 3D imaging tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9019G01S13/9017G01S13/9011G01S13/9052G01S13/9094
Inventor 丁泽刚王岩李凌豪孙新帅曾涛
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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