Unlock instant, AI-driven research and patent intelligence for your innovation.

Spatial Target Attitude Estimation Method Based on Equivalent Radar Line-of-Sight Fitting of isar Image Sequences

A technology of image sequence and attitude estimation, which is applied in the direction of radio wave reflection/reradiation, radio wave measurement system, instrument, etc., can solve the problems of low efficiency and difficult direct application of attitude estimation algorithm, so as to improve efficiency and reduce calculation Complexity, the effect of ensuring accuracy

Active Publication Date: 2022-08-05
XIDIAN UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of data-driven approach performs well in real-world tasks, but the requirements on the simulation database and the way in which matches are found can make it inefficient
[0004] Because ISAR imaging itself is affected by the rotational motion of the target, and the image characteristics of ISAR images are different from optical images, it is difficult to directly apply many attitude estimation algorithms in the field of computer vision.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Spatial Target Attitude Estimation Method Based on Equivalent Radar Line-of-Sight Fitting of isar Image Sequences
  • Spatial Target Attitude Estimation Method Based on Equivalent Radar Line-of-Sight Fitting of isar Image Sequences
  • Spatial Target Attitude Estimation Method Based on Equivalent Radar Line-of-Sight Fitting of isar Image Sequences

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] See figure 1 , figure 1 This is a schematic diagram of a space target attitude estimation method for ISAR image sequence equivalent radar line-of-sight fitting provided by an embodiment of the present invention. As shown in the figure, the space target attitude estimation method for ISAR image sequence equivalent radar line-of-sight fitting in this embodiment is ,include:

[0071] Step 1: acquiring an ISAR image sequence of the target, and preprocessing the ISAR image sequence to obtain an ISAR target contour binary image sequence, where the ISAR target contour binary image sequence includes several frames of ISAR target contour binary images;

[0072] Step 2: Establish a 3D model of the target, and generate the corresponding ISAR theoretical projection image according to the candidate radar line-of-sight parameters in the search process according to the 3D model of the target, and search and match according to the similarity evaluation index. The binary image of the I...

Embodiment 2

[0142] In this embodiment, the technical effect of the method for estimating the attitude of the space target by the equivalent radar line-of-sight fitting of the ISAR image sequence of the first embodiment is further described by means of a simulation experiment.

[0143] (1) Simulation conditions

[0144] See image 3 , image 3 is a three-dimensional model diagram of a space target provided by an embodiment of the present invention. In this embodiment, the observation scene is set as follows:

[0145] The initial pose of the target is ;

[0146] The rotation vector is ;

[0147] Radar observation line-of-sight pitch range , the azimuth range , a total of 30 ISAR images were acquired at equal intervals.

[0148] (2) Simulation experiment content and result analysis

[0149] First, preprocess the ISAR image sequence to obtain a binary image of the target contour, such as Figure 4a and Figure 4b shown, where, Figure 4a is the first frame of ISAR image provid...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a space target attitude estimation method for ISAR image sequence equivalent radar sight fitting. On the basis of space target attitude change and ISAR observation model, first, the overall contour of the space target is extracted by using digital image processing technology; then, Through the intelligent optimization algorithm, the most similar theoretical projection image sequence to the actual ISAR image is searched, so as to determine the equivalent radar line-of-sight parameters corresponding to each frame of ISAR image; finally, the sequence image information is fused to observe the difference between the actual radar line-of-sight and the equivalent radar line-of-sight according to the ISAR. The conversion relationship of the target is determined by least squares curve fitting to determine the initial pose and rotation parameters of the target. The invention utilizes the overall contour feature of the target to realize image matching search, overcomes the problem of unstable target scattering point features, describes the geometric projection relationship of ISAR imaging through the equivalent radar line of sight, first solves the imaging projection parameters of a single frame, and then fuses sequence image information, The accuracy of the algorithm is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of radar image processing, and in particular relates to a space target attitude estimation method for ISAR image sequence equivalent radar line of sight fitting. Background technique [0002] The target pose estimation algorithm is widely used in the field of computer vision. The algorithm is based on the RGB image and depth image of the target from multiple perspectives, and recovers the three-dimensional pose information of the target through the extraction and association of feature points. The ISAR system can obtain high-resolution two-dimensional images of the target at different angles by observing the space target for a long time and at a large angle. Therefore, many studies have tried to use the above ISAR imaging results to achieve accurate estimation of the space target's on-orbit attitude. , which is of great significance for space target health detection, on-orbit monitoring, and abnormal behavio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01S13/90
CPCG01S13/9021G01S13/9094
Inventor 周峰李弘政刘磊徐安林杜荣震石晓然
Owner XIDIAN UNIV