Measurement System Design of Spatial Position Accuracy of Dynamic Targets

doi:10.3788/CJL202148.1304001

CIOMP OpenIR

	Measurement System Design of Spatial Position Accuracy of Dynamic Targets
	L. Yang and N. Zhang
	2021
发表期刊	Zhongguo Jiguang/Chinese Journal of Lasers
ISSN	2587025
卷号	48 期号:13
摘要	Objective: The main dynamic performance indexes of the photoelectric theodolite are dynamic tracking accuracy and dynamic measuring accuracy. The target detection is to track the airborne flight targets, such as aircrafts, which usually consumes a lot of manpower and material resources. Therefore, the process detection and the final detection before this step are detected by the dynamic targets provided indoors. The dynamic targets are used to simulate objects in space with a long distance and can provide real-time spatial location information. This equipment can be used to carry out an indoor process detection and a final detection on a target tracking equipment such as photoelectric theodolite, so that can analyze the dynamic tracking performance of a target tracking equipment. With the development of science and technology, the performance of a photoelectric theodolite is improved, and the dynamic target has developed from the traditional simple rotary dynamic target to the high-precision one. The improvement from a tracking detection equipment to a tracking measurement equipment requires spatial positions with high precision. The spatial position accuracy of a dynamic target includes static accuracy and dynamic accuracy. The static accuracy is measured by Leica theodolite, and the measuring accuracy is 0.5". At present, the available dynamic accuracy detection methods include tracking method, video judging method and autocollimator detection method. The tracking method has low tracking speed, low accuracy, and high instrument price, so it is not suitable for the dynamic accuracy detection on target. In addition, the video judging method has low sampling speed, large reference position error, and low measurement accuracy. The autocollimator detection method can detect the dynamic errors caused by shafting shaking and rotating arm deformation, which has a certain reference value, but it cannot give the dynamic precision of the target comprehensively. Based on the above analysis, there is a lack of an effective method to measure the dynamic precision of dynamic targets. Methods: This article introduces a spatial target position measurement method to measure the accuracy of the target position when the target is in the state of high-speed movement. This method uses a computer vision technology to record the motion trajectory of a dynamic target captured by a high-speed camera in the whole field of view, and the recorded information is inverted into an actual space position to obtain the objective spatial position information of this target. A spatial position precision measurement system is designed based on this method. The measurement platform is composed of the system and the dynamic target equipment. By analyzing the relationship between the target and the measurement system, the state parameters of the measurement system could be calculated. Based on these parameters, the theoretical position of the target could be derived. By comparing the theoretical position with the actual position, the position accuracy of the dynamic target was able to be confirmed. After analyzing the error sources of the space target position measurement system, the total error of the whole system is less than 1.00", which meets the design requirement of the measurement system. Results and Discussions To measure the spatial position accuracy of a certain type of high-precision dynamic target, the static accuracy of the dynamic target was first measured, which was less than 0.59", and then the dynamic accuracy of the dynamic target was measured with the spatial position accuracy measurement system. The measurement results are shown in Table 1. As shown in the table, the maximum dynamic error for different speeds and different positions is 4.01". Combining the measurement error of the measuring system as described above, the total dynamic error of the dynamic target is 4.13". Generally, the dynamic measurement accuracy of photoelectric theodolite in China is not less than 20". According to the principle of error transfer, the design requ rement of the dynamic precision of the high-precision dynamic target is within 5". The total dynamic error of the high-precision dynamic target measured by this measurement system is 4.13", which is less than 5". The dynamic target meets the dynamic precision index requirement. This experiment confirmed that the spatial position accuracy measurement system can be widely used for dynamic precision parameter detection of dynamic targets, so that it can be used as a tracking measurement equipment. Conclusions: This article mainly studied the measurement method of the spatial position accuracy of the dynamic target based on the perspective geometry theory. The measurement method adopts the high-speed image processing method, and converts the three-dimensional spatial information into the two-dimensional image information through the imaging system. The advantages of the method are objective detection, non-contact and high precision. Based on the method, the article established one spatial position precision measurement system, and the dynamic precision of a high-precision dynamic target was measured by this measurement system. The experimental results show that the measurement system can complete the initial dynamic calibration of dynamic targets, so that it can be used as a tracking measurement equipment. The design of the spatial position precision measurement system lays a foundation for further solving the difficult problems in dynamic measurement precision detection of target tracking equipment such as photoelectric theodolite, and fills the gap in the field of dynamic detection of target tracking equipment. 2021, Chinese Lasers Press. All right reserved.
DOI	10.3788/CJL202148.1304001
URL	查看原文
收录类别	EI
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/65404
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	L. Yang and N. Zhang. Measurement System Design of Spatial Position Accuracy of Dynamic Targets[J]. Zhongguo Jiguang/Chinese Journal of Lasers,2021,48(13).
APA	L. Yang and N. Zhang.(2021).Measurement System Design of Spatial Position Accuracy of Dynamic Targets.Zhongguo Jiguang/Chinese Journal of Lasers,48(13).
MLA	L. Yang and N. Zhang."Measurement System Design of Spatial Position Accuracy of Dynamic Targets".Zhongguo Jiguang/Chinese Journal of Lasers 48.13(2021).

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