多幕光学法测量弹丸炸点坐标及误差分析

针对飞行弹丸对空中目标近炸炸点位置测量,提出了多幕光学法测量技术。根据试验特点,分析了多光幕交汇测量弹丸炸点位置存在的问题,研究了采用侧向相机辅助多光幕交汇测量技术。通过相机采集到的炸点图像,建立相机、模拟目标和多光幕交汇光幕阵列空间几何计算模型。利用弹丸的飞行轨迹和弹丸炸点图像平面坐标,研究了弹丸炸点侧向空间坐标的计算方法和多光幕交汇测量系统二维坐标修正原理,给出了弹丸炸点坐标计算函数。利用微分法从交汇光幕夹角、光幕幕厚、测时和测距等方面分析测量误差。经计算分析,模拟目标中心高度小于50m时,炸点三维坐标的误差小于40mm。

Measurement of Projectile Burst Coordinates by Using Multi-Screen Optical Method and Its Error Analysis

The multi-screen optical method is put forward to solve the problem of three-direction coordinate measurement when the flying projectile gets close to object and explodes in the high altitude. According to experiment characteristic, the demerits of multi-screen across target are pointed out and the technology of using lateral layout area camera to assistant multi-screen across target is studied. The mathematics geometry model on camera, simulating object and multi-screen across target is set up based on projectile burst image acquired by lateral camera. The lateral coordinates calculation method and the modified principle of two-dimensional coordinates of multi-screen across target are studied and analyzed by using projectile flying contrail and its plane coordinates of burst image. The function of three-dimensional projectile burst coordinates is given. The differential method is applied to analyze their coordinate′s errors, which come from the angle of intersection screen, the thick of screen, the measurement time, ranging and so on. Coordinate errors will be less than 40 mm when the height of simulating object is less than 50 m by theoretical analysis and calculation.