Application of low-altitude photogrammetry in test ofprojectile falling point coordinates

Based on ground observation platform, most testing devices for projectile falling point (FP) positioning have limitation of visibility and cannot predict outline coordinates of FP, and cannot distinguish ballistic sequence for bursts of intensive shooting test.According to geometric position relation between object point and image point, three methods for measuring projectile falling point of UAV in the air are proposed:interpolation method (IM), distance ratio method (DRM) and attitude angle solved method (AASM).Basic principle and mathematic model of three algorithms are introduced firstly. Then three methods are verified by test data of simulation test. Minimum technical requirements of camera are calculated finally. Experiments show that accuracy of IM and DRM is less than 3 m and accuracy of AASM is less than 0.3 m.