Systems and methods for determining entry of a navigation system into a structure
AssigneeHoneywell International Inc.
InventorTom Judd
Life of this patent
Estimating the term…
Abstract
Systems and methods are operable to determine that a navigation system has entered a structure. An exemplary embodiment monitors a magnetic field at an outdoor position, monitors a magnetic field at a current position, compares a characteristic of the monitored magnetic field at the current position with a corresponding characteristic of the outdoor magnetic field, and determines entry into the structure at least as a function of a change in the determined characteristic of the monitored magnetic field from the corresponding characteristic of the outdoor magnetic field.
Claims19
A method for determining entry into a structure, the method comprising:
- monitoring a magnetic field at an outdoor position;
- monitoring a magnetic field at a current position;
- comparing a characteristic of the monitored magnetic field at the current position with a corresponding characteristic of the outdoor magnetic field;
- and
- determining entry into the structure at least as a function of a change in the determined characteristic of the monitored magnetic field from the corresponding characteristic of the outdoor magnetic field.
A navigation system, comprising:
- a navigation sensor system operable to generate information corresponding to at least one of a direction, a rotation, and an acceleration;
- a magnetic field detection unit operable to sense a magnetic field;
- and
- a global navigation satellite system (GNSS) unit operable to receive a plurality of GNSS satellite signals and operable to determine a current position of the navigation system;
- and
- a processor system communicatively coupled to the navigation sensor system, the magnetic field detection unit, and the GNSS unit, and the processor system operable to:
- monitor the magnetic field at the current position of the navigation system from information received from the magnetic field detection unit;
- determine a characteristic of the monitored magnetic field;
- compare the determined characteristic of the monitored magnetic field with a corresponding characteristic of an outdoor magnetic field;
- and
- determine that the navigation system has entered a structure in response to a change in the determined characteristic of the monitored magnetic field from the corresponding characteristic of the outdoor magnetic field.
A system for determining that a navigation system has entered a structure, comprising:
- means for monitoring a magnetic field at a current position of the navigation system;
- and
- means for determining a characteristic of the monitored magnetic field, for comparing the determined characteristic of the monitored magnetic field with a corresponding characteristic of an outdoor magnetic field, and for determining that the navigation system has entered the structure in response to a change in the determined characteristic of the monitored magnetic field from the corresponding characteristic of the outdoor magnetic field.
Dependencies are inferred from the claim text.