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Complex field structured SAR ship target dynamic simulation and speed estimation method

A speed estimation and dynamic simulation technology, which is applied in the direction of radio wave reflection/re-radiation, using re-radiation, measurement devices, etc., can solve the problem of lack of a large number of simulation samples, the inability to obtain SAR images of ship targets, and the inability to obtain ship targets, etc. problem, to achieve the effect of simplifying the calculation process, accurately obtaining, and simplifying the complexity

Active Publication Date: 2021-07-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention is to solve the problem that there is a lack of a large number of simulation samples when doing SAR ship target simulation, and the existing SAR ship target simulation method cannot obtain accurate ship target SAR images, resulting in the inability to obtain accurate ship target problems

Method used

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  • Complex field structured SAR ship target dynamic simulation and speed estimation method
  • Complex field structured SAR ship target dynamic simulation and speed estimation method
  • Complex field structured SAR ship target dynamic simulation and speed estimation method

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specific Embodiment approach 1

[0028] Specific implementation mode one: refer to Figure 1-7 Specifically illustrate the present embodiment, the complex domain structured SAR ship target dynamic simulation and speed estimation method of the present embodiment, including:

[0029] Step 1. Obtain the 3D model of the ship, preprocess the 3D model of the ship, and divide the preprocessed 3D model of the ship into a plurality of triangular surface elements;

[0030] Step 2, setting radar parameters, performing ray tracing according to the set radar parameters, and obtaining the space coordinates of ship target scattering points;

[0031] Step 3. Carry out ship target imaging based on the space coordinates of ship target scattering points in step 2; the specific process is:

[0032] Step 31, record in t i The set of ship target scattering points obtained at any time is P i , then the ship target scattering point set P i Expressed by the following formula:

[0033]

[0034] in, means t i The azimuth coo...

specific Embodiment approach 2

[0038] Specific embodiment two: what this embodiment is different from specific embodiment one is that described step carries out preprocessing to ship 3D model; Concrete process is:

[0039] Remove the underwater mechanism of the 3D model of the ship, the underwater mechanism includes propellers, anchors or flags; after preprocessing, it can make the physical process of imaging the ship target closer to the real SAR, and at the same time reduce the division of triangular elements time.

[0040] Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0041] Specific embodiment three: what this embodiment is different from specific embodiment one or two is that the triangular surface element side length divided in the described step one gets 1 / 6th of the wavelength of the radar incident wave, expressed as:

[0042]

[0043] Among them, △l represents the side length of the triangle surface; c represents the speed of light, and f represents the radar carrier frequency;

[0044] The quality and quantity of triangle surface elements determine the length of time to calculate the collision detection, so time cost and computer resource limitations should be considered first.

[0045] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a complex field structured SAR ship target dynamic simulation and speed estimation method, which belongs to the field of SAR image processing. The method aims at solving the problems that a large number of simulation samples are lacked during SAR ship target simulation, and an existing SAR ship target simulation method cannot obtain an accurate ship target SAR image, so that an accurate ship target cannot be obtained. The method comprises the following steps of acquiring a ship 3D model, preprocessing the ship 3D model, and dividing the preprocessed ship 3D model into a plurality of triangular surface elements, conducting ray tracing according to set radar parameters, and acquiring ship target scattering point space coordinates, conducting ship target imaging, inputting the training sample into the AlexNet network to obtain a trained AlexNet pre-training model, inputting a to-be-tested sample into the trained AlexNet pre-training model, and calculating to obtain an AlexNet network complex number domain speed estimation result. The method is used for SAR ship target dynamic simulation and speed estimation.

Description

technical field [0001] The invention relates to a method for dynamic simulation and speed estimation of a complex number domain structured SAR ship target. It belongs to the field of SAR image processing. Background technique [0002] Since the synthetic aperture radar generally adopts side view, when the ship is irradiated by the radar beam, the ship target will scatter electromagnetic waves in all directions when it receives the radar beam. In addition, some parts are blocked and there will be shadow effects, and there will be top-bottom inversion and Issues such as perspective shrinkage. The RCS of the target is related to the incident angle of electromagnetic waves, ship structure, material, etc. There is also coherent speckle noise caused by random scattering in the resolution unit irradiated by electromagnetic waves, which makes the scattering model of the ship target more complicated. Therefore, in the traditional SAR ship target simulation method, multiple scatteri...

Claims

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Application Information

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IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9094G01S7/418G01S7/415G01S7/417
Inventor 张云王军化青龙姜义成
Owner HARBIN INST OF TECH
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