Abstract
Precision of guided projectiles depends equally on the accuracy in determining the coordinates of the objective and on the exactness of the measurement devices utilized for position and attitude calculation of the projectile. Development of algorithms for low-cost high-precision terminal guidance systems is a cornerstone in research in this field. Semiactive laser (SAL) kits, and particularly quadrant detector devices, have been developed to improve precision in guided weapons. Photodetection system can be functionally divided into two main parts: sensing and processing. The sensed signal is processed to estimate the spot coordinates, i.e., the laser footprint, which provides some information regarding projectile-target relative position, to obtain the needed information for the navigation and guidance algorithms. The electrical intensities that a real sensor provides under laboratory conditions are compared to a mathematical model based on area intersection calculations to simulate the intensities on real flights. Then, four different processing algorithms, two of them rational, and the other two logarithmic, are tested for different spot sizes, which are nonlinear. Proposing an interpolation algorithm based on the four electrical intensities obtained in a semiactive laser quadrant photodetector, laser footprint center estimation is improved for artillery applications. Finally, an example illustrating a projectile flight is employed to compare real and calculated laser footprints in order to select the best algorithm for artillery applications.
Highlights
A guided ammo designed to hit a preassigned target and, in addition, to avoid or eliminate collateral damage is commonly denominated as a precision-guided munition (PGM)
The purpose of this paper is to obtain a linear method for the laser footprint center calculation, in a semiactive laser quadrant photodetector, by an interpolation algorithm based on the four electrical intensities obtained during simulated shots for an artillery rocket in a set of ballistic flights during its terminal phase
From this nominal impact point, which is different for different launch angles, the target has been deviated on an 81-point grid with a maximum deviation of 100 m from nominal impact point
Summary
A guided ammo designed to hit a preassigned target and, in addition, to avoid or eliminate collateral damage is commonly denominated as a precision-guided munition (PGM). Since the destructive power of explosive weapons diminish with separation, even small enhancements in exactness permit an objective to be destroyed with less or smaller bombs The accuracy of these weapons is needy both on the precision in setting the coordinates of the target and on the exactness of the position and attitude estimations of the measurement equipment utilized. Inertial measurement unit (IMU) and global navigation satellite system (GNSS) hybrid devices stretch the exact solutions for PGMs, yet in a few events, these arrangements probably will not be sufficient. A robust guidance algorithm, basically reasonable for devices typified by slight glint levels, for example, electrooptical munitions, is proposed by [3]. A method for numerous objective detection is exhibited in [6]
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