Method of fire control for gun-based anti-aircraft defence

Patent metadata

Field	Value
Publication number	US-9625236-B2
Application number	US-201414894607-A
Country	US
Kind code	B2
Filing date	May 7, 2014
Priority date	May 28, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A method of fire control against aerial targets traveling towards an object of protection. A position of the object of protection is known. A position of the aerial target is measured. The position of the aerial target is estimated. A velocity of the aerial target is estimated. A model of a guidance law of the aerial target is applied. An acceleration of the aerial target sufficient to hit the object of protection is calculated. A future trajectory of the aerial target is predicted based on the position of the object of protection, the estimated position of the aerial target, the estimated velocity of the aerial target, and the calculated acceleration of the aerial target. Points of aim along the predicted future trajectory are calculated. A fire control system includes at least one sensor for measuring the position of the aerial target as a function of time.

First claim

The invention claimed is:

1. A method of fire control against aerial targets on their way towards an object of protection, wherein a position of the object of protection is known, the method comprising:
measuring a position of the aerial target,
estimating the position of the aerial target,
estimating a velocity of the aerial target,
applying a model of a guidance law of the aerial target,
calculating an acceleration of the aerial target to hit the object of protection,
predicting a future trajectory of the aerial target based on the position of the object of protection, the estimated position of the aerial target, the estimated velocity of the aerial target, and the calculated acceleration of the aerial target, and
calculating points of aim along the predicted future trajectory.

2. The method of fire control against aerial targets according to claim 1 , wherein the guidance law of the aerial target comprises navigation constants calculated by multiplying an observed acceleration by a predicted time to impact into the object of protection squared, divided by a distance from the aerial target to the object of protection.

3. The method of fire control against aerial targets according to claim 2 , wherein the guidance law of the aerial target comprises a maximum acceleration, a size of which is estimated by an analysis of the observed acceleration of the aerial target.

4. The method of fire control against aerial targets according to claim 1 , wherein the position of the object of protection is the position of a gun-based anti-aircraft defence.

5. A fire control system for fire control against aerial targets, the fire control system comprising:
at least one sensor for measuring a position of the aerial target as a function of time,
a control module configured to
measure a position of the aerial target,
estimate the position of the aerial target,
estimate a velocity of the aerial target,
apply a model of a guidance law of the aerial target,
calculate an acceleration of the aerial target to hit the object of protection,
predict a future trajectory of the aerial target based on the position of the object of protection, the estimated position of the aerial target, the estimated velocity of the aerial target, and the calculated acceleration of the aerial target, and
calculate points of aim along the predicted future trajectory.

Assignees

• Bae Systems Bofors Ab

Inventors

• Wållberg Kjell

Classifications

• F41G3/14

  Indirect aiming means · CPC title

• F41G3/04 Primary

  for dispersing fire from a battery {; for controlling spread of shots; for coordinating fire from spaced weapons} · CPC title

• F41G3/02

  using an independent line of sight · CPC title

• F41G5/08 Primary

  Ground-based tracking-systems for aerial targets · CPC title

• G05D3/20

  using a digital comparing device · CPC title