METHOD OF PROVIDING INTEGRITY BOUNDING OF WEAPONS

• US 20080127814A1
• Filed: 01/21/2008
• Published: 06/05/2008
• Est. Priority Date: 05/23/2003
• Status: Abandoned Application

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Britigan, John D., McKendree, Thomas L., Habereder, Hans L.
• Application Number:
  US12/017,177
• Publication Number:
  US 20080127814A1
• Time in Patent Office: Days
• US Class Current: 89/1.11
• CPC Class Codes: F41A 17/08 for inhibiting firing in a specified direction, e.g. at a friendly person or at a protected area F41A27/02 takes precedence
• CPC Class Codes: F41G 7/007 Preparatory measures taken before the launching of the guided missiles
• CPC Class Codes: F41G 9/00 Systems for controlling missiles or projectiles, not provided for elsewhere
• CPC Class Codes: F42C 13/00 Proximity fuzes; Fuzes for remote detonation F42C9/148 takes precedence; constructional details F42C19/00; mounting of antennas F42B30/006
• CPC Class Codes: F42C 15/40 wherein the safety or arming action is effected electrically

Abstract

A method for providing integrity bounding of a weapon for use in weapon selection and targeting is presented. The method determines an integrity bound for the weapon, the integrity bound defining a zone around the target aim-point within which engagement must occur to meet a predetermined integrity level (i.e., a probability of engagement within an allowable engagement zone). A method of assigning weapons for engaging a target is also presented. The method includes determining an aim-point of a target and determining an alert limit for the aim-point, the alert limit comprising a zone that includes the aim-point and excludes any friendly sites. Weapon selection is then performed by selecting a weapon having an integrity bound less than or equal to the alert limit.

Claims

1. A system to provide integrity bounding of weapons comprising:

a munition;

an integrity bound determining computer processor configured to determine if an integrity bound for the munition at an integrity level is acceptable by determining if the integrity bound is within an alert limit, the alert limit being a region beyond which the munition is commanded not to engage and comprising an aim point corresponding to a location of a target and excluding friendly sites, the integrity level corresponding to a probability that the munition will not engage the outside the integrity bound; and

a targeting and weapon assignment computer processor in communication with the integrity bound determining processor, the targeting and weapon assignment computer processor configured to determine targeting of sites and selecting the munition to use in engagement of the sites based on the integrity bound being acceptable.

2. The system of claim 1 wherein the integrity bound determining computer processor is further configured to:

develop a fault tree for the weapon;

develop a budget of allowable error rates for each fault of the fault tree;

determine a bounded estimate of each error for each fault in the fault tree based on the budgeted error rate of each the fault; and

determine the integrity bound from the bounded estimates.

3. The system of claim 1 wherein the communication of integrity bound determination computer processor to the targeting and weapon assignment computer processor is through a data storage element.

4. The system of claim 3 wherein the munition further includes the data storage element.

5. The system of claim 1 wherein the munition includes a payload and a steering component.

6. The system of claim 5 wherein the munition further comprises at least one of a guidance system in communication with the steering component and an acceleration unit in communication with the steering component.

7. A system to provide integrity bounding of weapons comprising:

a munition comprising an integrity menu processor;

an integrity bound determining computer processor configured to determine if an integrity bound for the munition at an integrity level is acceptable by determining if the integrity bound is within an alert limit, the alert limit being a region beyond which the munition is commanded not to engage and comprising an aim point corresponding to a location of a target and excluding friendly sites, the integrity level corresponding to a probability that the munition will not engage the outside the integrity bound; and

a targeting and weapon assignment computer processor in communication with the integrity bound determining processor, the targeting and weapon assignment computer processor configured to determine targeting of sites and selecting the munition to use in engagement of the sites based on the integrity bound being acceptable.

wherein the integrity menu computer processor receiving a plurality of munition integrity bounds from the integrity bound determining computer processor.

8. The system of claim 7 wherein the integrity bound determining computer processor is further configured to:

develop a fault tree for the weapon;

develop a budget of allowable error rates for each fault of the fault tree;

determine a bounded estimate of each error for each fault in the fault tree based on the budgeted error rate of each the fault; and

determine an integrity bound from the bounded estimates.

9. The system of claim 7 wherein the communication of the integrity bound determination computer processor to the targeting and weapon assignment computer processor is through a data storage element.

10. The system of claim 7 wherein the munition further comprises the data storage element.

11. The system of claim 7 wherein the munition comprises a payload and a steering component.

12. The system of claim 11 wherein the munition further comprises a guidance system in communication with the steering component and an acceleration unit in communication with the steering component.

13. The system of claim 11 wherein the munition further comprises an acceleration unit in communication with the steering component.

15. The article of claim 13 wherein the instructions causing a machine to determine an integrity bound comprises instructions causing a machine to:

develop a fault tree for the weapon;

develop a budget of allowable error rates for each fault of the fault tree;

determine a bounded estimate of each error for each fault in the fault tree based on the budgeted error rate of each the fault; and

determine the integrity bound from the bounded estimates.

17. The article of claim 15, further comprising instructions causing a machine to identify nodes that do not have another node coupled thereto, and to determine an integrity bound for that node based on the error rate determined for that node.

19. The article of claim 17, further comprising instructions causing a machine to determine a bound error size probability distribution for each higher level node by convolving the probability distributions of bound error size for all the immediately lower nodes of each higher level node, and selecting from a resulting curve at the top node a bound error size at a probability equal to a desired integrity level as the integrity bound of the munition equal to the sum.

14. An article comprising a machine-readable medium that stores executable instructions to provide integrity bounding of a weapon, the instructions causing a machine to:

determine an integrity bound for the weapon around an aim-point corresponding to a location of a target, the integrity bound defining a zone around the aim-point outside of which an engagement will not occur at an integrity level, the integrity level corresponding to a probability that the munition will not engage the outside the integrity bound.

16. The article of claim 14 wherein the instructions causing a machine to develop a budget of allowable error rates for each fault of the fault tree comprises instructions causing a machine to:

traverse nodes from a top node to a bottom node;

for nodes that are logically ORed together, taking the error rate of the node connected to the output of the OR gate and distributing it among the nodes connected to the inputs of the OR gate;

for nodes that are ANDed together, taking the error rate of the node connected to the output of the AND gate, taking the log of the error rate, distributing the log of the error rate between the nodes connected to the inputs of the AND gate to get intermediate error rate measures, and taking the inverse log of the intermediate error rate measures to get the node error rate for each node connected to the inputs of the AND gate.

18. The article of claim 16, further comprising instructions causing a machine to determine the sum of the largest bound error size at each allocated error rate of all bottom nodes in the fault tree, and equate the integrity bound of the munition to the sum.

20. The article of claim 18, further comprising instructions causing a machine to assess one or more intermediate nodes as if they were the highest node, and use these values to complete the evaluation of the integrity bound.