Guidance system
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJoseph J. Perruzzi, Michael Dipaola, Edward J. Hillard
Life of this patent
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Abstract
A method and apparatus for directing a pursuing vehicle, such as a torpedo, on an intercept trajectory from a launching vehicle to a target vehicle with evasion capabilities. The guidance system bases a solution on vectors on a first Cartesian coordinate system. Evasive maneuvers for the target vehicle are based upon vectors on a second Cartesian coordinate system. The guidance system converts the evasive maneuver to the first coordinate system and then performs an iterative process using initial guidance parameter values to determine, upon convergence of the solutions, final guidance parameters for the target vehicle.
Claims22
In a system for directing a pursuing vehicle from a launching vehicle to a target vehicle wherein the launching vehicle determines a range and bearing to and course and speed of the target vehicle and generates initial operating parameters for transfer to the pursuing vehicle that establish an intercept trajectory including a path along an aim point bearing to the target vehicle from the launching vehicle and wherein the determination of the initial operating parameters is made with respect to a first Cartesian coordinate system having an ordinate axis on the determined bearing, the improvement for enabling the operating parameters to compensate for a post launch evasive maneuver of the target vehicle comprising the steps of:
- defining the trajectory of the target vehicle including the evasive maneuver on a second Cartesian coordinate system;
- converting the definition of the target vehicle course from the second to the first Cartesian coordinate system by rotating the second Cartesian coordinate system by an angle equal to the difference between the aim point path bearing and the determined bearing to the target;
- and
- iteratively processing the courses of the pursuing and target vehicles to the intercept in advance of the launch to generate the initial operating parameters.
A system for directing a pursuing vehicle from a launching vehicle to a target vehicle wherein the launching vehicle determines a range and bearing to and course and speed of the target vehicle and generates initial operating parameters for transfer to the pursuing vehicle that establish an intercept trajectory including a path along an aim point bearing to the target vehicle from the launching vehicle and wherein the determination of the initial operating parameters is made with respect to a first Cartesian coordinate system having an ordinate axis on the determined bearing, the improvement for enabling the operating parameters to compensate for a post launch evasive maneuver of the target vehicle comprising the steps of:
- first means for defining the trajectory of the target vehicle including the evasive maneuver on a second Cartesian coordinate system;
- second means for converting the definition of the target vehicle course from the second to the first Cartesian coordinate system by rotating the second Cartesian coordinate system by an angle equal to the difference between the aim point bath bearing and the determined bearing to the target;
- and
- third means for iteratively processing the courses of the pursuing and target vehicles to the intercept in advance of the launch to generate the initial operating parameters.
Dependencies are inferred from the claim text.