Sensor independent engagement decision processing

• US 8,063,347 B1
• Filed: 01/19/2009
• Issued: 11/22/2011
• Est. Priority Date: 01/19/2009
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Urbano, Leonardo F., Bock, Gregory F., Moffett, Ivy T.
• Primary Examiner(s): GREGORY, BERNARR E
• Application Number:
  US12/355,851
• Time in Patent Office: 1,037 Days
• Field of Search: 244 31- 319, 244 32- 33, 89/11.1, 342 52- 55, 342/61, 342/62, 342/175, 342/195, 342/59, 342 73- 81, 342/89, 342 94- 97
• US Class Current: 244/3.1
• CPC Class Codes: F41G 7/007 Preparatory measures taken before the launching of the guided missiles
• CPC Class Codes: F41G 7/30 Command link guidance systems homing F41G7/2206
• CPC Class Codes: F41H 11/02 Anti-aircraft or anti-guided missile or anti-torpedo defence installations or systems cartridges or missiles for producing smoke or for dispensing radar chaff or infrared material F42B5/15, F42B12/48, F42B12/70; informative reference: details of radar or sonar systems G01S7/00; jamming or electronic countermeasures G01S7/38, G01S7/495, H04K3/00

Abstract

A method for engaging a target uses sensors to generate target track(s). The tracks are projected forward in time and associated with a track quality measure. The maximum seeker look angle and beamwidth, acceleration, and net radar sensitivity characteristics are listed for each type of interceptor. A plurality of target intercept times are generated for each interceptor type. The probability that the interceptor can acquire the target is determined from the projected target tracks, the quality measure, and the characteristics. The probability of hitting the target is determined from the probability of acquisition and acceleration of the interceptor type. The probabilities of acquisition and of hitting the target are aggregated, and the type of interceptor to use is the type having (a) an extreme value of the aggregation or (b) the earliest intercept time from among the interceptors having an aggregation value above a threshold value.

Claims

1. A method for engaging a target, said method comprising the steps of:

providing a plurality of sensors for producing track data representing target tracks;

projecting said track data forward in time to generate projected target tracks;

evaluating said projected target tracks and associating an estimated quality measure with each projected target track;

for each of a plurality of interceptor missiles, listing at least characteristics of (a) maximum seeker look angle with associated uncertainty, (b) acceleration or other kinematic capability, (c) seeker beamwidth, and (d) net radar sensitivity;

determining a plurality of target intercept times for each of a plurality of types of interceptor missiles;

for each of said plurality of target intercept times, using said projected target tracks, said estimated quality measures, and said characteristics to determine, for each of said plurality of interceptors missiles, a probability that the interceptor missile can acquire said target;

determining, for each of said plurality of interceptor missile types, a probability of hitting the target from the projected target track quality, the probability of acquisition of a particular type of interceptor missile, and the acceleration or other kinematic characteristics of said interceptor missile type;

determining which type of said plurality of interceptor missiles to use by aggregating said probabilities of acquisition and probabilities of hitting said target, and

selecting an interceptor missile of said plurality of interceptor missiles having one of (a) an extreme value of the resulting aggregation and (b) the earliest intercept time from among those interceptors having a resulting aggregation above a minimum value.

2. A method according to claim 1, further comprising the step of at least one of launching and controlling the selected one of said plurality of interceptor missiles.

3. A method according to claim 1, wherein said step of listing the characteristics includes the step of listing autopilot lag of at least one of said plurality of interceptor missiles.

4. A method according to claim 1, wherein:

said step of aggregating includes the step of multiplying a probability mass function of target acquisition and a probability of hitting said target at a completion of each of at least one seeker scans, to generate a product of said probabilities; and

summing a product of said probabilities over a finite number of seeker scans to compute a probability of guidance.

5. A method according to claim 1, wherein said step of evaluating said projected target tracks and associating an estimated quality measure with each projected target tracks is based upon estimated sensor errors as a function of range.

6. A method for engaging a target, said method comprising the steps of:

providing a plurality of sensors for producing track data representing target tracks;

projecting said track data forward in time to generate projected target tracks including target state and covariance;

evaluating said projected target tracks and associating an estimated quality measure with each projected target track;

for a plurality of interceptor missiles, listing at least characteristics of (a) maximum seeker look angle, (b) maximum acceleration or other kinematic capability, (c) net radar sensitivity (d) seeker beamwidth, and (e) interceptor autopilot lag;

determining a plurality of target intercept times for each of a plurality of types of interceptor;

for each of said plurality of target intercept times, and using said projected target tracks, said quality measures, and said characteristics, determining, for each of said plurality of interceptors, a target acquisition probability mass function;

determining, for each of said plurality of types of interceptor, one of a conditional probability of kinematics and a probability mass function of the probability of kinematics;

determining an instantaneous probability of guidance or probability of hitting the target as an aggregation which is the product of (a) the target acquisition probability mass function and (b) said one of the conditional probability of kinematics and the probability mass function of the probability of kinematics; and

selecting as the type of interceptor to be launched that type of interceptor having an extreme value of the resulting aggregation.

7. A method according to claim 6, further comprising the step of launching at least one interceptor of the selected types of interceptor.

8. A method according to claim 6, further comprising, after said step of determining the instantaneous probability of guidance or probability of hitting the target, the step of selecting for further processing only those values of probability of guidance or probability of hitting the target which exceed a given threshold, wherein the given threshold represents a lower limit of acceptable missile performance, to define a set of acceptable interceptors.

9. A method according to claim 8, further comprising the step of determining, target intercept time for each interceptor of said set of acceptable interceptors, and selecting from among the set of acceptable interceptors that interceptor having an earliest intercept time.

10. A method according to claim 9, further comprising the step of launching that interceptor having the earliest intercept time.

11. A system for engaging a target, said system including:

a plurality of types of interceptor missiles, each of which types defines (a) a radar-based seeker defining characteristics of a maximum look angle with associated uncertainty, seeker beamwidth, and net radar sensitivity, and (b) a characteristic of maximum acceleration or other kinematic limit;

a plurality of sensors, each of said plurality of sensors for producing track data representing target tracks;

a filter arrangement coupled to said sensors for projecting said track data forward in time to generate projected target tracks;

a quality association processor coupled to said filter arrangement for evaluating said projected target tracks and for associating an estimated quality measure with each projected target track to produce at least target states and covariance;

a target intercept time processor coupled to said quality association processor, for determining, from at least said target states and covariance, a plurality of target intercept times for each of said types of interceptor missiles;

a target acquisition processor for, for each of said plurality of intercept times, and using at least said projected target tracks, said quality measures, and said characteristics, determining, for each of said types of interceptor missiles, a probability that the interceptor missile type can acquire said target;

a target hit probability processor for determining, for each of said interceptor missile types, a probability of hitting the target from the estimated quality measure, the probability that the interceptor missile can acquire the target, and the acceleration or other kinematic characteristics of said interceptor missile type; and

an interceptor missile type identification processor for determining which type of interceptor missile to use for engaging said target by aggregating said probabilities of acquisition and probabilities of hitting said target, and for selecting as the type of interceptor missile that type having one of (a) an extreme value of the resulting aggregation and (b) the earliest intercept time from among those interceptors having the resulting aggregation above a minimum value.

12. A system according to claim 11, further comprising an interceptor launch and guidance controller for launching and guiding toward the target the selected one of said interceptor missiles.

13. A system according to claim 11, wherein:

said plurality of types of interceptor missiles further include a characteristic of autopilot lag, and wherein;

said target acquisition processor further uses said autopilot lag for determining, for each of said types of interceptors missiles, the probability that the interceptor missile type can acquire said target.

14. A system according to claim 11, wherein:

said interceptor type identification processor;

(a) multiplies a probability mass function of target acquisition and said probability of hitting said target at the completion of each of a plurality of seeker scans, to generate a product of said probabilities; and

(b) sums the product of said probabilities over a finite number of said seeker scans to compute a probability of guidance.

15. A system for engaging a target, comprising:

a plurality of types of interceptor missiles;

a plurality of sensors for producing track data representing target tracks associated with a sensed target;

a filter arrangement coupled to said plurality of sensors for projecting said track data forward in time to generate projected target tracks;

a quality association processor coupled to said filter arrangement for evaluating said projected target tracks and for associating an estimated quality measure with each projected target track;

a target intercept time processor coupled to said quality association processor, for determining, using said estimated quality measure, a plurality of target intercept times for each of said types of interceptor missiles;

a target acquisition processor for determining, for each of said plurality of intercept times and for each of said types of interceptor missiles, a probability that the interceptor missile type can acquire said target;

a target hit probability processor for determining, for each of said types of interceptor missiles, a probability of hitting the target using the quality measure and the probability that the interceptor missile can acquire the target; and

an interceptor missile type identification processor for determining which type of interceptor missile to use for engaging said target by aggregating said probability of acquisition and probability of hitting said target, and for selecting as the type of interceptor missile to use for engaging said target that type of interceptor missile having one of (a) an extreme value of the resulting aggregation and (b) an earliest intercept time.

16. The system of claim 15, wherein each of said plurality of types of interceptor missiles includes:

(a) a radar-based seeker defining characteristics of a maximum look angle with associated uncertainty, seeker beamwidth, and net radar sensitivity, and

(b) a characteristic of maximum acceleration or other kinematic limit.

17. The system of claim 16, wherein said a target acquisition processor further uses said projected target tracks, said quality measures, and said characteristics to determine the probability that the interceptor missile type can acquire said target.

18. The system of claim 15, wherein said quality association processor produces, for each projected target track, at least a target state and an associated covariance.

19. The system of claim 18, wherein said target intercept time processor further uses at least said target state and associated covariance to determine said plurality of target intercept times.

20. The system of claim 15, wherein said target hit probability processor further uses acceleration or other kinematic characteristics of said interceptor missile type to determine said probability of hitting the target.