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<p>Seven-light-screen precision target is an new exterior ballistic parameter testing device that enables non-contact measurement of multiple parameters with a single shot, including impact coordinates, flight velocity vector, pitch and azimuth angles of the flight direction, and velocity attenuation rate for obliquely incident flying targets. Precise calibration of structural parameters for invisible light-screen array of seven-light-screen precision target is crucial for ensuring its accuracy and constitutes an essential step in its development. In this paper, we proposes a high-accuracy calibration method. It uses a light-blocking probe to simulate the entry of a projectile into the invisible light screen for the extraction of the actual light screen center. Dual theodolites are employed in conjunction with the readings of a grating ruler during screen crossing to quickly and accurately locate the coordinate points within the screen. Multiple extracted screen coordinate points are then fitted to reconstruct the actual light screen plane, achieving accurate spatial position calibration of multiple invisible screens. This paper introduces the structure and measurement principle of seven-light-screen target, describes the calibration system's composition and working principle, and derives the specific calibration algorithm formulas. The constructed system was applied to calibrate an actual seven-screen target. Live-fire experiments were conducted based on this calibrated target, and the measured impact coordinates were compared against results from cardboard target measurements. The research results show that the structural parameters obtained by the proposed calibration method are accurate. After calibration, the coordinate measurement accuracy of the seven-light-screen precision target within a 1&#xa0;m × 1 m target sensor area is better than 1.5&#xa0;mm. This calibration method is universal for the calibration of light-screen arrays with similar principles and provides an effective solution for calibrating structure parameters of multi-light-screen precision targets.</p>

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Seven-light-screen precision target and high-accuracy calibration of its invisible spatial structure parameters

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Fen Gao,
  • Yuzhun He,
  • Pengwei Shi

摘要

Seven-light-screen precision target is an new exterior ballistic parameter testing device that enables non-contact measurement of multiple parameters with a single shot, including impact coordinates, flight velocity vector, pitch and azimuth angles of the flight direction, and velocity attenuation rate for obliquely incident flying targets. Precise calibration of structural parameters for invisible light-screen array of seven-light-screen precision target is crucial for ensuring its accuracy and constitutes an essential step in its development. In this paper, we proposes a high-accuracy calibration method. It uses a light-blocking probe to simulate the entry of a projectile into the invisible light screen for the extraction of the actual light screen center. Dual theodolites are employed in conjunction with the readings of a grating ruler during screen crossing to quickly and accurately locate the coordinate points within the screen. Multiple extracted screen coordinate points are then fitted to reconstruct the actual light screen plane, achieving accurate spatial position calibration of multiple invisible screens. This paper introduces the structure and measurement principle of seven-light-screen target, describes the calibration system's composition and working principle, and derives the specific calibration algorithm formulas. The constructed system was applied to calibrate an actual seven-screen target. Live-fire experiments were conducted based on this calibrated target, and the measured impact coordinates were compared against results from cardboard target measurements. The research results show that the structural parameters obtained by the proposed calibration method are accurate. After calibration, the coordinate measurement accuracy of the seven-light-screen precision target within a 1 m × 1 m target sensor area is better than 1.5 mm. This calibration method is universal for the calibration of light-screen arrays with similar principles and provides an effective solution for calibrating structure parameters of multi-light-screen precision targets.