US 11,808,868 B2
Early velocity measurement for projectiles by detecting spin
Paul D. Zemany, Amherst, NH (US); and Matthew F. Chrobak, Groton, MA (US)
Assigned to BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
Appl. No. 16/972,251
Filed by BAE Systems Information and Electronic Systems Integration Inc., Nashua, NH (US)
PCT Filed Aug. 30, 2019, PCT No. PCT/US2019/049010
§ 371(c)(1), (2) Date Dec. 4, 2020,
PCT Pub. No. WO2020/072153, PCT Pub. Date Apr. 9, 2020.
Claims priority of provisional application 62/725,466, filed on Aug. 31, 2018.
Prior Publication US 2021/0239430 A1, Aug. 5, 2021
Int. Cl. G01S 19/50 (2010.01); G01S 19/52 (2010.01); F42B 10/26 (2006.01); F42B 10/64 (2006.01); G01S 19/18 (2010.01); F42B 10/62 (2006.01)
CPC G01S 19/52 (2013.01) [F42B 10/26 (2013.01); F42B 10/62 (2013.01); F42B 10/64 (2013.01); G01S 19/18 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A precision guidance munition assembly for a guided projectile, comprising:
a front end and a rear end of the precision guidance munition assembly defining a longitudinal axis therebetween;
a canard assembly, rotatable about the longitudinal axis, with at least one canard, wherein the at least one canard is moveable;
a munition body coupled to the rear end of the precision guidance munition assembly;
a rotation sensor carried by the precision guidance munition assembly; and
at least one non-transitory computer-readable storage medium carried by the precision guidance munition assembly having a set of instructions encoded thereon that when executed by at least one processor operates to aid in guidance, navigation, and control of the guided projectile, wherein the set of instructions perform the following:
measure a spin rate of the guided projectile using the rotation sensor after firing the guided projectile from a launch assembly;
determine a velocity of the guided projectile based, at least in part, on the spin rate;
estimate a miss distance that the guided projectile will miss a target based at least in part on the velocity; and
generate a command to reduce the miss distance.