Patent ID: 11913757
Assignee: ROSEMOUNT AEROSPACE INC.
Field: Other special machines (Mechanical engineering)
Classification: CPC F  G | IPC F

Claim 0:
1. A method for constraining navigational drift in a munition caused by Inertial Measurement Unit (IMU) bias error during flight of the munition in a constellation of a plurality of munitions in a Global Positioning System (GPS) denied attack of a plurality of ground targets wherein each munition is provided with a datalink communication system to communicate with other munitions in the constellation and a navigation system having an IMU for guiding the munition in flight, the method comprising:
determining an estimated position and covariance of the estimated position in each munition in the munition constellation via each munitions' navigation system;
determining a range of each munition relative to at least one other munition in the munition constellation via each munitions' datalink communication system;
sharing the estimated position and range to at least one other munition in the munition constellation by each munition via each munitions' datalink communication system;
determining navigational drift for each munition via each munitions' navigation system utilizing the estimated position of at least one other munition and the range to that at least one other munition in the munition constellation; and
constraining navigational drift in each munition by compensating for IMU bias error in each munition utilizing the determined navigational drift for each respective munition in the munition constellation.