39 results about "Ballistic coefficient" patented technology

A low orbit optical imaging satellite has a long thin satellite body housing an optical telescope arrangement. A major part of the telescope arrangement has its optical axis roughly parallel to the direction of elongation and includes a mirror arrangement deployed to direct a line of sight of the optical telescope out sideways from the direction of elongation. The transverse dimensions of the satellite body are preferably minimized to be close to the optical aperture dimension of the optical telescope, thereby providing a high ballistic coefficient and high orbit lifetime for orbits in the low thermosphere.

A projectile is improved aerodynamically by cutting grooves having parabolic transitions between the depth of the groove and the bearing surface. An ejectable tip is attached to the leading edge of the projectile to facilitate greater ballistic coefficient during flight and improved expansion upon impact at a soft target.

Embodiments of the invention include an elongate rifle bullet with a plurality of circumferential grooves having overmolded polymer therein defining embedded polymer rings. Embodiments of the invention include cartridges with propellant and such bullets. In one or more embodiments, the bullet has a body portion and a converging nose portion. The polymer rings have an outer surface that is flush with, that is, conforming to the outer surface of the body. The polymer may have be selected to have a favorable coefficient of friction with respect to the barrel. A feature and advantage of embodiments is that the metal to metal contact between the bullet and the barrel is reduced while not diminishing the ballistic coefficient of the bullet.

This invention is a precision weapon that utilizes solely as a projectile, a precision-ball made out of a suitable material namely solid C260 brass. It employs a smoothbore precision-barrel with a metal toothed rack / rail affixed along the northern hemisphere of the muzzle of the barrel that effectively converts some of the forward motion of the ball into rotational motion so that the ball is mechanically forced to rotate upwards / backwards at very high speed that can run into millions of rotations per minute, vastly improving its ballistic coefficient and downrange accuracy. The weapon can be produced in a variety of existing types of firearms such as bolt-action, falling-block or semi-automatic, and can be chambered for a variety of calibers. A 5.5625 mm caliber bolt-action rim fire weapon for instance will provide a user with a weapon ideal for hunting small-game or for target shooting purposes. See FIGS. 1, 2 and 3.

A gun firing method whereby multiple projectiles segments that are contained in a cartridge case are fired simultaneously to create a pattern on the target to increase the hit probability of the dispersion. Some of the multiple projectile segments are side by side within the cartridge case and have ends that are approximately 90 degrees to the central longitudinal axis of the cartridge. This causes the projectile segments to rotate around their for and aft axis upon leaving the gun barrel, improves their accuracy, and effectively provides the projectile segments with a higher ballistic coefficient and a higher sectional density, to strike the target at a higher velocity and with greater retained energy to efficiently penetrate the target.

A method of delivering over the air, shelled portions of fluids or granular substances containing effective ingredients, to a target, includes the following stages: selecting a type and a size of the shelled portions containing the required effective ingredients, based on mission parameters and physical data of a scene containing the target; conveying the shelled portions to a delivery point, based on the mission parameters and the physical data; and ballistically delivering the shelled portions towards the target, wherein the shelled portions comprise fluids or granular substances covered by shells that provide the shelled portions a ballistic coefficient that is significantly higher than a ballistic coefficient of similar portions without the shells.

The invention discloses a re-entry prediction method for a small elliptical target under the condition of sparse data, which processes N-circle data collected in the past 5 days, uses a numerical method to determine the orbit of the single-circle data respectively, and uses the Kepler square root as the root. Compared with the prior art, the present invention proposes a numerical system based on the characteristics of sparse data and small elliptical orbits, and uses the semi-numerical method for orbit integration, and uses the least squares method to fit the ballistic coefficient of the re-entry target. A reentry forecasting method combining the method with the semi-numerical method. It effectively solves the problems that the residual error of joint orbit determination of multi-turn data is too large or does not converge in the case of sparse data, and it is difficult to determine the ballistic coefficient of orbit determination of single-turn data.

A system for three-dimensional tracking of high speed undersea projectiles may utilize a distributed field of randomly positioned passive acoustic sensors. The system measures variables related to the pressure field generated by a supercavitating projectile in flight wherein the amplitude of the pressure generated at a point in space is related to the projectile dimensions, velocity, and trajectory. The system iteratively processes data from the sensors to measure launch velocity, flight direction (trajectory), ballistic coefficient (drag), and / or maximum range.

The invention discloses a high-precision space target fall prediction method based on a cataloging root number sequence. The invention specifically includes the following steps: step 1, analysing the cataloging root number sequence as an actual measured orbit value, step 2, establishing an orbit perturbation model, step 1. 3. Calculate the ballistic coefficient, and step 4. Predict the fall time and the fall position. The invention relates to the technical field of aerospace measurement and control. This is a high-precision space target fall prediction method based on cataloging root number sequence. The orbit extrapolation can be realized by using the semi-numerical method, and the integral step size can be taken as an integer multiple of the orbit period, which is tens of minutes or even tens of hours. Compared with the numerical method, the calculation efficiency is higher. Orbit integration can ensure the prediction accuracy and improve the calculation efficiency at the same time. It can meet the high-precision and high-efficiency calculation requirements in the case of a large number of space targets, so as to achieve fast and accurate fall prediction.

The invention discloses a method for dynamically correcting atmospheric perturbation parameters based on changes in the space environment. coefficient and ballistic coefficient correction factor, and the corrected ballistic coefficient is obtained according to the pre-built ballistic coefficient correction model; The analysis results of the influence of the parameter forecast on the error of the orbit forecast, and the analysis results of the systematic error of solving the ballistic coefficient absorption atmospheric density model are obtained by performing dynamic correction modeling of the atmospheric perturbation parameters; the ballistic coefficient correction factor is a function of sum. The present invention dynamically corrects the ballistic coefficient based on the change of the space environment, can solve the problem of large error in the track prediction of the space target under the condition of abnormal atmosphere, and can improve the prediction accuracy.