Precision Strike Concepts Exploiting Relative GPS Techniques

Abstract

Many future weapons and weapon carriers are expected to have an avionics suite that includes an integrated INS/GPS set. This relatively inexpensive means of navigation motivates examination of whether very high accuracy (-10 ft circular error probable [CEPI) may be obtainable using only this set of weapon avionics operating in either a relative or differential GPS mode. This paper presents several different weapon system concepts that exploit such a capability to attack both fixed and stationary (but mobile) targets. It also addresses the theory behind each concept that enables the high accuracy and discusses the assumptions relating to each technique.Concepts explained include the use of aircraft equipped with an INS/GPS/synthetic aperture radar @AR) avionics suite to perform a real-time relative targeting function for weapon initialization. The importance of reasonable aircraft maneuvers to enhance observability and speed up the three-dimensional (3-D) targeting fire control solution is also addressed. Simulation results for several realistic scenarios are presented.

Precision SAR Targeting Using Stereoscopy and RGPS aboard a UAV

“…1 -ground tracks that cross at aperture center -will exhibit cross range layover differences. Equations (1) and (2) show that either scheme can provide layover differences that are directly proportional to the height (h) of objects within the scene.…”

“…2 The concept of using stereoscopic mensuration in radar grammetry to derive three dimensional coordinates from radar images has been around even longer. 3 Advances in radar technology have only recently made it possible to sufficiently reduce the size of high-performance SAR sensors to couple these ideas and extend them to a UAV platform.…”