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Circumference SAR multi-target tracking method based on random finite set

A multi-target tracking and finite set technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measurement devices, etc., can solve problems such as complex calculations, improve detection performance, and avoid complex data association processes.

Inactive Publication Date: 2019-06-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the traditional data association-based multi-target tracking method calculation complex problem, and propose a circular SAR multi-target tracking method based on random finite sets

Method used

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  • Circumference SAR multi-target tracking method based on random finite set
  • Circumference SAR multi-target tracking method based on random finite set
  • Circumference SAR multi-target tracking method based on random finite set

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specific Embodiment approach 1

[0028] Specific implementation mode one: the specific process of the circular SAR multi-target tracking method of the random finite set in this implementation mode is as follows:

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the following combination figure 1 , figure 2 , image 3 , Figure 4 ,,Figure 5, Figure 6 And the specific embodiment is described in further detail to the present invention;

[0030] in figure 2 It is a flow chart of the circular SAR moving target tracking method based on the improved GMPHD filter according to the present invention.

[0031] Step 1: Preliminary detection of the moving target based on the DPCA-CFAR method to obtain the measurement value of the moving target;

[0032] Step 2: Establishing the state vector and measurement vector of the moving object according to the measurement value of the moving object obtained in step 1, and establishing a...

specific Embodiment approach 2

[0038] Specific embodiment two: the difference between this embodiment and specific embodiment one is that in the first step, the moving target is initially detected based on the DPCA-CFAR method, and the measurement value of the moving target is obtained; the specific process is:

[0039] The geometric relationship of the dual-channel circumferential SAR system is as follows: figure 1 As shown, for the multi-channel circumferential SAR system carrier platform at a distance from the target plane z=Z h on the plane of R g The radius moves at a uniform speed along the circular path, and the linear velocity of the carrier platform is V, so the angular velocity of the carrier platform is expressed as ω=V / R g ;

[0040] For multi-channel circular SAR, N antennas are placed horizontally along the tangent direction of the radar track, the distance between the antennas is d, and the single-send and multiple-receive working mode is adopted. The reference channel (antenna C 1 ) trans...

specific Embodiment approach 3

[0054] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the OS-CFAR preliminary detection is performed on each frame of image to obtain the target measurement value, and a higher false alarm is set in the constant false alarm detection. Probability P fa , to ensure that based on the higher detection probability P d Obtain the measurement value of the moving target; the specific process is:

[0055] Detection threshold η in OS-CFAR detector k From the false alarm probability P fa and|I DPCA,k The probability statistics of (x,y)|determined,

[0056] The preliminary detection results of OS-CFAR are expressed as

[0057]

[0058] where the detection threshold η k From the false alarm probability P fa and I DPCA,k Probabilistic statistical determination of (x, y);

[0059] Preliminary test results for OS-CFAR B k (x, y) for image processing to obtain the measurement value of the moving target; the process is:

[0060] The connected targe...

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Abstract

The invention discloses a circumference SAR multi-target tracking method based on a random finite set and relates to a circumference SAR multi-target tracking method. The invention aims to solve the problem that the traditional multi-target tracking method based on data association is complex in calculation. The method comprises the following steps: 1, performing initial detection on a moving target based on a DPCA-CFAR method to acquire a measuring value of the moving target; 2, according to the measuring value of the moving target, establishing a state vector set and a measuring vector set of multiple moving targets; 3, correcting the acquired measuring vector to acquire a measuring vector after compensation; 4, according to the measuring vector after compensation, establishing a targetstate model and a measuring model; 5, according to the given target state model and the measuring model, performing target tracking based on a GMPHD filter. The method is applied to the fields of a microwave remote sensing technology and radar data processing.

Description

technical field [0001] The invention relates to the field of microwave remote sensing technology and radar data processing, in particular to the field of multi-target tracking algorithm. Background technique [0002] Circumferential SAR (CSAR), as a high-resolution imaging method for the ground, has the advantages of long-term observation and obtaining 360° omnidirectional information of the target. According to the characteristics of the observation, the radial component of the moving target at different angles can be obtained. In the image sequence, the position of the stationary target remains unchanged, and the position of the moving target is constantly changing due to its own motion. Due to the radial velocity that causes the azimuth position to shift, the imaging position of the moving target is not the real position. Mainly for the moving target detected by the circular SAR image sequence, it is tracked and processed to eliminate the static clutter without moving fe...

Claims

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Application Information

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IPC IPC(8): G01S13/72G01S13/90
Inventor 张云穆慧琳衣志航李宏博齐欣
Owner HARBIN INST OF TECH
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