Patent ID: 9207328
Filing Date: 2015-12-08
Classification: F41G,G01S

Abstract:
1. A system for determination of attitude for a projectile in flight, the system comprising: at least one antenna mounted on the projectile, each antenna of the at least one antenna configured to receive global positioning system (GPS) signals from at least four satellites through wireless communication; a signal receiving unit communicably coupled to the each antenna of the at least one antenna to receive the GPS signals from the each antenna, the signal receiving unit configured to ascertain an earth referenced velocity vector of the projectile with respect to earth's co-ordinates by utilizing the GPS signals; a plurality of magnetometers mounted onto the projectile and configured to ascertain a projectile referenced earth's magnetic field vector with reference to body co-ordinates of the projectile; and a processing unit communicably coupled to the signal receiving unit to receive the earth referenced velocity vector of the projectile from the signal receiving unit, and to the plurality of magnetometers to receive the projectile referenced earth's magnetic field vector from the plurality of magnetometers, wherein the processing unit ascertains a projectile referenced velocity vector of the projectile with reference to the body co-ordinates of the projectile along the projectile's axis in a direction of the flight, wherein the processing unit is pre-loaded with a earth referenced earth's magnetic field vector with respect to the earth's co-ordinates or ascertains the earth referenced earth's magnetic field vector based on location of the projectile in earth's coordinates as deduced from the GPS signals, and wherein the processing unit is configured to utilize the projectile referenced velocity vector of the projectile and the earth referenced earth's magnetic field vector along with the earth referenced velocity vector of the projectile and the projectile referenced earth's magnetic field vector to determine the attitude of the projectile using a TRIAD method.