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A 3D imaging method based on lp regularization for miniaturized unmanned aerial vehicles

A 3D imaging and modeling technology, applied in radio wave measurement systems, radio wave reflection/re-radiation, instruments, etc., can solve the problem of not effectively reducing the number of MIMO-SAR down-view 3D imaging array elements and array length, without taking into account Imaging problems of small arrays of miniaturized UAVs, inability to apply to miniaturized UAV platforms, etc.

Active Publication Date: 2020-10-20
AIR FORCE UNIV PLA
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Problems solved by technology

[0004] Since the existing methods are all aimed at the azimuth grating lobe effect, improving resolution, or reducing data storage, etc., without considering the small array imaging problem required by miniaturized UAVs, this will not effectively reduce MIMO -The number of array elements and array length required for SAR downward-looking 3D imaging cannot be applied to miniaturized UAV platforms

Method used

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  • A 3D imaging method based on lp regularization for miniaturized unmanned aerial vehicles
  • A 3D imaging method based on lp regularization for miniaturized unmanned aerial vehicles
  • A 3D imaging method based on lp regularization for miniaturized unmanned aerial vehicles

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[0094] Example: MIMO-SAR downward-looking 3D imaging simulation experiment

[0095] Simulation experiment: In order to verify the effectiveness of the method in this paper, the 3D imaging simulation is carried out with the point target as the model, and the transmitted signal is a chirp signal. The simulation parameters are shown in Table 1. The location parameters are shown in Table 2.

[0096] Table 1 Simulation parameter settings

[0097]

[0098] Table 2 point target position parameters

[0099]

[0100] Simulation 1: In order to verify the effectiveness of the method, the following simulation experiment is now carried out. Set 8 point targets by the positions shown in Table 2, the scattering coefficient is 1, the number of pulses per second is 256, and each pulse is sampled at 128 points, respectively using the traditional imaging method and the proposed method of the present invention for these 8 points Point target imaging.

[0101] point target position as ...

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Abstract

The present invention provides an Lp regularization-based miniaturized unmanned aerial vehicle-mounted equipment down-looking three-dimensional imaging method. The method includes the following steps that: 1, pre-processed down-looking three-dimensional SAR echo signals are rearranged, so that an over-complete dictionary can be built, and an imaging process is converted into an Lp regularization model; and 2, down-sampling is performed on the Lp regularization model, and the Bayesian learning method is used to solve the regularization model to obtain a reconstructed 3D imaging result. With the method adopted, the number of emission array elements and length array which are required by imaging can be greatly deceased with imaging quality ensured, or imaging quality can be improved under the same array condition, and therefore, the method can be applied to miniaturized unmanned aerial vehicle platforms.

Description

technical field [0001] The invention relates to signal and information processing technology, in particular to a miniaturized unmanned aerial vehicle-mounted three-dimensional imaging method based on Lp regularization. Background technique [0002] Multi-Input Multi-Output-Synthetic Aperture Radar (MIMO-SAR) downward-looking three-dimensional imaging is a new three-dimensional imaging method developed on the basis of single-station SAR two-dimensional imaging. This imaging method uses the transmission of large-bandwidth signals to obtain range resolution, uses the synthetic aperture formed by platform motion to obtain resolution along the track (azimuth direction), and uses the MIMO radar antenna array in the pitch direction to obtain resolution in the pitch direction, thereby realizing 3D Imaging of Earth Observation Scenes. UAV-borne MIMO-SAR downward-looking 3D imaging has broad application prospects in earth observation, battlefield information acquisition, and situatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/282
CPCG01S7/282G01S13/904
Inventor 康乐张群李涛泳罗迎林永照其他发明人请求不公开姓名
Owner AIR FORCE UNIV PLA
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