Four screens target measuring system and calibration with paper target sheet

A new bullet location measurement system is introduced.Four optical screens are installed respectively on two planes and diagonal planes of the hexahedron.When the bullet flys through the screens,the time of bullet impacting on screens is recorded.The impacting position can be calculated by using the data of times.The principle of four screens target measuring system for precise bullet location is presented.The result is calibrated by paper target sheet.The calibration formula is deduced.Comparing to the position of bullet hole in paper target sheet,the formula is modified to reduce the measurement error.