A high-speed super-resolution mimo array imaging method

A technology of super-resolution and imaging methods, applied in instruments, measurement devices, and re-radiation, etc., can solve the problem of the absence of super-resolution MIMO array imaging algorithms

Active Publication Date: 2019-05-14
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For real-time imaging systems, there are no super-resolution MIMO array imaging algorithms available

Method used

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  • A high-speed super-resolution mimo array imaging method
  • A high-speed super-resolution mimo array imaging method
  • A high-speed super-resolution mimo array imaging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Example 1: Point Spread Function

[0127] In this embodiment, the point spread functions of two imaging algorithms, MIMO-RMA and coherence factor MIMO-RMA, are calculated respectively. The arrangement of the MIMO array adopted is as follows: image 3 shown. The array contains 82 transmitting array elements and 82 receiving array elements. The distance between adjacent array elements is 6.2mm, and they are evenly arranged on the X-axis and Y-axis. The dimensions of the transmitting and receiving apertures are both 500mm. Other parameters used for the calculations are listed in Table 1.

[0128] Table 1 The main parameters used in the calculation of point extension function

[0129]

[0130] The point spread function is to adopt the ideal point target, generate the echo signal by the signal model of SA, and use figure 2 The shown imaging algorithm obtains an image of a point target.

[0131] The point spread function results calculated by MIMO-RMA and coherence f...

Embodiment 2

[0142] Embodiment 2: Electromagnetic Simulation Imaging

[0143] This embodiment is mainly used to verify the imaging performance of the coherent factor MIMO-RMA on continuous targets. The main parameters used in the simulation are shown in Table 1, the only difference is that the values ​​of the α and β parameters are different, namely α=1.5, β=0.00375.

[0144] Simulation consists of two steps:

[0145] Step 1: Using the method of moments to generate the scattered field of the target as echo data;

[0146] The imaging object such as Figure 6 Shown is a two-dimensional model of an eight-leaf fan-shaped ideal electric conductor. Electromagnetic simulation uses a Hertzian electric dipole source, the position of the source is equivalent to the position of the transmitting array element; the point detector is equivalent to the receiving array element. The emission sources are excited in spatial order, and the receiving array elements are received in parallel, and only the el...

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Abstract

The present invention discloses a high-seed super-resolution MIMO (multi input multi output) array imaging method. The method includes the following steps that: step 1, data sampling is performed on an MIMO array; step 2, an MIMO-RMA (range migration algorithm) is utilized to complete three-dimensional reflectivity image reconstruction; step 3, the acceleration of the MIMO-RMA is utilized to calculate a coherence factor; and step 4, the coherence factor corrects a reflectivity three-dimensional image. According to the imaging algorithm of the invention, reflectivity incoherent power is simplified by rearranging echo data, the acceleration of the MIMO-RMA is utilized to calculate the coherence factor, and the calculation speed of the coherence factor is greatly increased in combination with a parallel algorithm; super-resolution performance is balanced through controlling parameters alpha and beta according to a defect that the coherent factor suppresses weak scattering points, and at the same time, the stability of the algorithm is not affected; and the coherence factor is utilized to correct the reconstructed three-dimensional image, so that sidelobe and ground noises can be effectively suppressed, and higher resolution can be achieved.

Description

technical field [0001] The invention relates to a synthetic aperture imaging algorithm, in particular to a high-speed super-resolution MIMO array imaging method. Background technique [0002] Multiple-input multiple-output (Multi Input Multi Output, MIMO) array is an array imaging solution with broad development prospects. Using diversity technology, the number of antennas and channels is greatly reduced, and the resolution performance of the system is maintained. The synthetic aperture (Synthetic Aperture, SA) imaging algorithm can be applied to the MIMO array imaging system. The characteristic of this technology is based on the pulse compression technology. Preferred method for imaging systems. SA adopts a Born-approximated electric field signal model, and does not consider any far-field approximation in order to ensure the accuracy of the image. The two most classic SA imaging methods for MIMO array imaging are backprojection algorithm (BPA) and range migration algorit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90G01S7/292
CPCG01S7/292G01S13/904G01S13/9011G01S13/9017
Inventor 常天英郭企嘉崔洪亮
Owner JILIN UNIV
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