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The principle and method of existing indoor shadow photography system and shadow target calibration system are introduced. The effects of muzzle shock wave, projectile shock wave, trajectory descent of projectile flight and natural wind, dust, ground irregularity and stray light in the field measurement environment when using Shadow Photography to measure the Motion Attitude of Large Caliber Projectile are analyzed. The key parameters of the large caliber projectile motion attitude measurement system in the field are determined, and the key links that need to be paid attention to in the design are put forward accordingly.

To meet the large-caliber projectile motion measurement system calibration requirement, developed a large-caliber projectile motion measurement system calibration system, gives the calibration principle and working process, design a visibility good green light source as the collimating light source, the design targets based on the filtering and PSD field grid position detection module; Aiming at the calibration requirement that the six faces of cavity cross grids frame cannot be shielded, the cavity cross grids adjustment module is designed. Error analysis shows that the calibration error of the system is 0.062mm.

The calibration principle and working process of shadowgraph station for large caliber projectile motion attitude measurement is studied. The main error factors affecting the calibration accuracy of the system are analysed, and the various errors in the calibration process are statistically analysed. The calibration error of the measurement system is calculated to be 0.062 mm. The error analysis process shows that the coincidence error between the laser optical axis and the central axis of double square nets is the main error of calibration. Among these errors, the installation error of optical window and the centering error of filtering target (Angle deviation between parallel light source beam axis and double square nets axis caused by coincidence error of reflected facula and incident facula) are the main sources of errors.