An accurate calibration method of the ball screen projection point targets tracking system

Cai Huaiyu; Ding Lei; Huang Zhanhua; Liu Kun

doi:10.12086/oee.2018.170656

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Cai Huaiyu, Ding Lei, Huang Zhanhua, et al. An accurate calibration method of the ball screen projection point targets tracking system[J]. Opto-Electronic Engineering, 2018, 45(8): 170565. doi: 10.12086/oee.2018.170656

Citation:

Cai Huaiyu, Ding Lei, Huang Zhanhua, et al. An accurate calibration method of the ball screen projection point targets tracking system[J]. Opto-Electronic Engineering, 2018, 45(8): 170565. doi: 10.12086/oee.2018.170656

An accurate calibration method of the ball screen projection point targets tracking system

1.
College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
2.
Key Laboratory of Opto-electronics Information Technology (Tianjin University), Ministry of Education, Tianjin 300072, China

More Information

Corresponding author: Ding Lei, E-mail: linda_dinglei@tju.edu.cn

Received Date 25 October 2017

Revised Date 28 March 2018

Published Date 25 August 2018

Abstract

Abstract

This paper proposes an accurately calibration method which is suitable for the scene, on the issues of multiple subsystems relative position detecting complexity in a ball screen projection point targets tracking system. Take the ball screen as the world coordinate system, and mark center of the ball by subsystem to implement coordinate transformation of the projection point among the subsystems. The author studies the calibration principle and the projecting method, and provides a solution. Through Matlab simulation analysis of the error factor, simulated results show that the ball screen calibration precision can be effectively improved by reducing the distance between the subsystem and its center or perfecting the projection point spatial distribution. Eventually, this paper presents a calibration method based on the TLS and designs a virtual sphere, calibration device and finishes the experiments. The experimental results meet the demand of quick and accurate site calibration.
- calibration precision of the ball /
- G-M model /
- total least square (TLS) /
- point target tracking system /
- calibration device

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References

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Overview

Overview

Overview: The ball screen projection point targets tracking system is a hardware-in-loop simulation system, which is used for testing the tracking and hitting performance of tanks or artillery. The testing can be achieved completely under laboratory, so it has become a popular research topic. It is multiple subsystems coordination work, so the data needs convert into the same coordinate system to give the control and evaluation by frequent coordinate transformation between the subsystems. As important parameters of coordinate transformation, the precision and maneuverability of the calibration result of subsystems relative position will affect the using range and test conditions of the simulation system. Generally, the distance date between the subsystems and the ball are measured by man or directly adopted the design scheme. However, the error is unavoidable in the field installation process. The relative positional relation cannot be exactly the same as the design scheme. In addition, the center of the ball screen is a virtual point and the manual measurement has a large error. The relevant researches aim at a mature measurement system that can acquire a large number of point clouds at a time and have high data measurement accuracy, such as the three-dimensional laser scanner. Only the accidental errors are analyzed and the impact of the calibration scheme is not taken into account on the calibration results. Therefore, these researches proposed optimization scheme is not applicable for the field calibration with small quantity and limited precision. This paper proposes an accurately calibration method, which is suitable for the scene on the issues of multiple subsystems relative position detecting complexity in a ball screen projection point targets tracking system. Take the ball screen as the world coordinate system, and mark center of the ball by subsystem to implement coordinate transformation of the projection point among the subsystems. The author studies the calibration principle and the projecting method, and provides a G-M solution model for the center of the ball screen in a calibration system coordinate system. Through Matlab simulation analysis of the error factor, simulated results show that the ball screen calibration precision can be effectively improved by reducing the distance between the subsystem and its center or perfecting the projection point spatial distribution. Eventually, this paper presents a calibration method based on the TLS and designs a virtual sphere, calibration device and finishes the experiments. The accuracy of the calibration is 0.44%, and the results meet the demand of quick and accurate site calibration.