The system and method for accurately determining range-to-go for a time-delayed command detonation of a projectile. Using dual laser and/or radio frequency detectors on the tail and on the nose of a spinning projectile to determine the range-to-go, time-to-go, and/or lateral offset from the projectile to the target. A time to detonation clock is used to determine when a projectile transitions from an exterior to an interior of a structure such that the projectile can more accurately detonate within a fixed structure.

The impact angle of a small caliber projectile is determined by accurately measuring the orientation angle of the projectile in flight and modeling epicyclical flight of the projectile. To measure the orientation angle, a projectile is fired along a trajectory within a test gantry. One or more sets of cameras captures images of the projectile in flight. The images are processed using computer vision to measure the position and orientation angle at each station. Calibration of the test equipment prior to the test firing of the projectile, allows for determination of these points in the 3d space of the test fixture. Aeroballistic models are fit to the orientation history. From these models, an impact angle is extrapolated.

The system and method for accurately determining range-to-go for a time-delayed command detonation of a projectile. Using dual laser and/or radio frequency detectors on the tail and on the nose of a spinning projectile to determine the range-to-go, time-to-go, and/or lateral offset from the projectile to the target. A time to detonation clock is used to determine when a projectile transitions from an exterior to an interior of a structure such that the projectile can more accurately detonate within a fixed structure.

The method and apparatus for a remote weapon station or incorporated into manually-aimed weapons. The methodology requires use of a muzzle velocity sensor that refines the aiming of the second and subsequent fires or volleys fired from weapon systems. When firing the first volley a weapon uses an estimated velocity and, at firing, the muzzle velocity of a projectile is measured. When firing the second volley a weapon's fire control calculates an aiming point using the measured velocity of the first volley.

A chronograph system with a frame, at least two sensors, an accelerometer, and a processor module. The frame is configured to removably couple to a barrel of a firearm. The sensors are attached to the frame and are configured to detect a projectile as the projectile passes each sensor. A first of the sensors may be separated from a second of the sensors by at least three inches. The accelerometer is attached to the frame and configured to track an orientation of the barrel. The processor module is communicatively coupled to the sensors and to the accelerometer and may be configured to receive timestamps from the sensors and the orientation of the barrel from the accelerometer, use the timestamps to determine a velocity of each projectile, and analyze the velocity data and the orientation of the barrel to aid a user in adjusting a scope of the firearm.

A chronograph system with a frame, at least two sensors, and a computing device. The frame is configured to removably couple to a barrel of a firearm. The sensors are attached to the frame and are configured to detect a projectile as the projectile passes each sensor. The chronograph system is configured to use data received from the at least two sensors regarding each projectile to determine a velocity of each projectile and create velocity data based on the velocity of each projectile. The computing device is configured to communicatively couple to the chronograph system and display the velocity data to a user of the firearm.

The ball existence determining part 301 determines a specific infrared zone where the stopped ball exists as a ball existing zone in plural infrared zones. The first object appearance determining part 302 determines the front and end infrared zones being adjacent the ball existing zone as front and end object appearance schedule zones, and determines whether or not the object for launching the ball appeared in either one of the front and end object appearance schedule zones. The second object appearance determining part 303 determines whether or not the object appeared in the remaining object appearance schedule zone when the object appeared in either one of the front and end object appearance schedule zones. The ball disappearance determining part 304 determines whether or not the ball in the ball existing zone disappeared when the object appeared in the remaining object appearance schedule zone. The ball launch detecting part 305 detects that the ball was launched by the object when the ball in the ball existing zone disappeared, and transmits a trigger signal.

A chronograph system has with a set of co-located start planes and a set of co-located stop planes spaced from the start planes, thereby minimizing measurement differences.

The ball existence determining part 301 determines a specific infrared zone where the stopped ball exists as a ball existing zone in plural infrared zones. The first object appearance determining part 302 determines the front and end infrared zones being adjacent the ball existing zone as front and end object appearance schedule zones, and determines whether or not the object for launching the ball appeared in either one of the front and end object appearance schedule zones. The second object appearance determining part 303 determines whether or not the object appeared in the remaining object appearance schedule zone when the object appeared in either one of the front and end object appearance schedule zones. The ball disappearance determining part 304 determines whether or not the ball in the ball existing zone disappeared when the object appeared in the remaining object appearance schedule zone. The ball launch detecting part 305 detects that the ball was launched by the object when the ball in the ball existing zone disappeared, and transmits a trigger signal.

A method and system are provided for accurately determining the point of impact of a bullet on a shooting disc or target plane and optionally the position of the shooter, wherein a number of light curtains are used for registering time instants of the passage of the bullet projectile through predetermined light planes by detecting the shadow cast by the bullet. Differences between the measured times and/or the measured times themselves are then used for calculating the velocity of the bullet and the points at which the trajectory of the bullet intersects the light planes and the target plane, which may be arranged or located behind or in front of the target disc/target disc arrangement of the system having the particular pattern of light curtains, allowing for the calculation of the centre impact point of the bullet on the shooting disc or target plane in 3D.