Orientation measurements for drift correction

摘要

Technology for measuring orientation is described. Signals can be received from a signal source having a known location via at least two antennas of the interferometer that are separated by a predefined distance. A delay between receiving the signals from the signal source at the at least two antennas of the interferometer can be calculated. A line of bearing (LOB) of the interferometer with respect to the signal source can be determined based on the delay between receiving the signals at the at least two antennas from the signal source. The orientation of the interferometer can be measured in a global coordinate system using the LOB of the interferometer with respect to the signal source.

主权项

1. A method for measuring an orientation at a navigation device, the method comprising:
receiving signals from a signal source having a known location via at least two antennas of the navigation device, wherein the at least two antennas are oriented at substantially the same angle and separated by a predefined distance; calculating a delay between receiving the signals from the signal source at the at least two antennas; determining a line of bearing (LOB) of the at least two antennas with respect to the signal source based on the delay between receiving the signals at the at least two antennas from the signal source; and measuring the orientation of the at least two antennas in a global coordinate system using the LOB, wherein the orientation is used to reduce drift at the navigation device by updating a previous orientation of the at least two antennas of the navigation device.