PROACTIVE MITIGATION OF NAVIGATIONAL UNCERTAINTY

• US 20140025286A1
• Filed: 07/17/2012
• Published: 01/23/2014
• Est. Priority Date: 07/17/2012
• Status: Active Grant

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Donovan, Kenneth B., Sorber, Scott O.
• Granted Patent: US 8,972,166 B2
• Time in Patent Office: Days
• US Class Current: 701/408
• CPC Class Codes: G01C 21/20 Instruments for performing navigational calculations G01C21/24, G01C21/26 take precedence
• CPC Class Codes: G01C 21/3415 Dynamic re-routing, e.g. recalculating the route when the user deviates from calculated route or after detecting real-time traffic data or accidents
• CPC Class Codes: G01C 21/3691 Retrieval, searching and output of information related to real-time traffic, weather, or environmental conditions arrangements for giving variable traffic instructions G08G1/09
• CPC Class Codes: G08G 1/096827 where the route is computed onboard
• CPC Class Codes: G08G 1/096844 where the complete route is dynamically recomputed based on new data

Abstract

Methods and devices for navigation and/or guidance. A device may be configured to predict an uncertainty of positioning data in the area, the prediction being based at least in part on a dynamic navigation model. The device may further be configured to guide the mobile entity based at least in part on the predicted uncertainty of the positioning data in the area. By predicting and guiding while the mobile entity is outside the area, the device may proactively mitigate an impact of the predicted uncertainty of the positioning data by initiating rerouting of the mobile entity, updating an inertial navigation system, and/or issuing an alert regarding the predicted uncertainty to of the positioning data to an operator of the mobile entity. The dynamic navigation model may comprise at least one of an environment model, a cost model, one or more positioning system models, and an excursion route model.

Claims

1. A method for guiding a mobile entity, the method comprising:

while the mobile entity is outside an area, predicting, with a processor, an uncertainty of positioning data in the area based at least in part on a dynamic navigation model; and

while the mobile entity is outside the area, guiding the mobile entity based at least in part on the predicted uncertainty of the positioning data in the area.

2. The method of claim 1, wherein guiding the mobile entity based at least in part on the predicted uncertainty of the positioning data in the area comprises acting to mitigate an effect of the predicted uncertainty of the positioning data.

3. The method of claim 2, wherein acting to mitigate the effect of the predicted uncertainty comprises initiating rerouting of the mobile entity if one or more mitigation criteria associated with rerouting the mobile entity are satisfied.

4. The method of claim 2, wherein acting to mitigate the effect of the predicted uncertainty comprises updating an inertial navigation system if one or more mitigation criteria associated with updating the inertial navigation system are satisfied.

5. The method of claim 4, wherein updating the inertial navigation system comprises initiating, while the mobile entity is outside the area, an update of a trusted inertial navigation position and a reset of the inertial navigation system.

6. The method of claim 2, wherein acting to mitigate the effect of the predicted uncertainty comprises issuing an alert regarding the predicted uncertainty of the positioning data to an operator of the mobile entity.

7. The method of claim 1, wherein the positioning data is data of a global navigation satellite system (GNSS).

8. The method of claim 1, further comprising

beginning an excursion of the mobile entity in a region that includes the area;

and

after beginning the excursion and before predicting the uncertainty of the positioning data in the area based at least in part on the dynamic navigation model;

acquiring navigation data from a remote data source or from sensors associated with the mobile entity, wherein the remote data source comprises a second mobile entity and/or a base station, and

updating the dynamic navigation model.

9. The method of claim 8, wherein updating the dynamic navigation model comprises integrating at least a portion of the navigation data and/or data derived from the navigation data into the dynamic navigation model.

10. The method of claim 9, further comprising transmitting the navigation data and/or at least a portion of the updated dynamic navigation model.

11. A dynamic navigation unit for a mobile entity, the dynamic navigation unit comprising:

a processor; and

a memory storing instructions which, when executed by the processor, cause the dynamic navigation unit to perform;

predicting an uncertainty of positioning data in an area, the predicting being performed with a proactive mitigation unit, performed while the mobile entity is outside the area, and based at least in part on a dynamic navigation model, and

initiating mitigation of an effect of the predicted uncertainty of the positioning data by sending mitigation data to a guidance unit, the guidance unit being configured to guide the mobile entity based at least in part on the mitigation data, the sending being performed while the mobile entity is outside the area.

12. The dynamic navigation unit of claim 11, wherein the dynamic navigation model comprises at least one of an environment model, a cost model, one or more positioning system models, and an excursion route model.

13. The dynamic navigation unit of claim 11, wherein the guidance unit is configured to guide the mobile entity based at least in part on the mitigation data by initiating rerouting of the mobile entity, updating an inertial navigation system, and/or issuing an alert regarding the predicted uncertainty of the positioning data to an operator of the mobile entity.

14. The dynamic navigation unit of claim 11, wherein the memory further stores instructions which, when executed by the processor, cause the dynamic navigation unit to perform, after the mobile entity begins an excursion in a region that includes the area and before predicting the uncertainty of the positioning data in the area:

acquiring navigation data provided by a data link receiver, a positioning data receiver, and/or one or more sensors associated with the mobile entity, and

updating the dynamic navigation model by integrating at least a portion of the navigation data and/or data derived from the navigation data into the dynamic navigation model.

15. The dynamic navigation unit of claim 14, further comprising:

the data link receiver; and

a data link transmitter,

wherein the data link receiver is configured to receive data from a remote data source, the remote data source comprising a second mobile entity and/or a base station, and

the data link transmitter is configured to transmit the navigation data and/or at least a portion of the updated dynamic navigation model to a remote data source via a data link.

16. The dynamic navigation unit of claim 15, further comprising

the positioning data receiver;

and

the one or more sensors,

wherein the positioning data receiver is configured to receive positioning data from a positioning system, and

the one or more sensors are configured to sense one or more attributes of the region.

17. The dynamic navigation unit of claim 16, wherein the mitigation data comprises the predicted uncertainty of the positioning data in the area, at least a portion of the navigation data and/or data derived from the navigation data, and/or at least a portion of the updated dynamic navigation model.

18. The dynamic navigation unit of claim 17, wherein the dynamic navigation unit is located on, located in, and/or attached to the mobile entity.

19. A navigation system comprising:

a first dynamic navigation unit associated with a first mobile entity, the first dynamic navigation unit configured to acquire navigation data and transmit the navigation data; and

a second dynamic navigation unit associated with the second mobile entity, the second dynamic navigation unit configured to;

receive the navigation data,

integrate at least a portion of the navigation data and/or data derived from the navigation data into a dynamic navigation model,

predict, while the second mobile entity is outside an area and based at least in part on the dynamic navigation model, an uncertainty of positioning data in the area, and

initiate mitigation of an effect of the predicted uncertainty of the positioning data by sending mitigation data to a guidance unit.

20. The navigation system of claim 19, wherein the guidance unit is configured to guide the second mobile entity, while the second mobile entity is outside the area and based at least in part on the mitigation data, by initiating rerouting of the second mobile entity, updating an inertial navigation system of the second mobile entity, and/or issuing an alert regarding the predicted uncertainty of the positioning data to an operator of the second mobile entity.