Location Finding#

Without knowing the accurate distance of the asset or if the asset is constrained to move in a 2D plane, one antenna array can provide the direction of the asset, but not its position. To determine the precise position of the asset, multiple antenna arrays must be used. By using more than one antenna array, the position of the asset can be determined using triangulation. The asset can be found at the intersection of the lines drawn in the directions determined by the direction-finding algorithm. Triangulation can also be supplemented with trilateration. Adding RSSI measurements to the direction estimations can further enhance the position estimation.

Location Finding with AoA#

In the case of Angle-of-Arrival estimation, the direction of the transmitting asset is determined on each locator. If the positions of the locators are known and the direction of the asset is known relative to each locator, then the position of the asset can be determined. However, to do so the direction information must first be gathered from each locator to a central device that does the position estimation, as shown in the following figure.

broken link 1#

Location Finding with AoD#

In the case of Angle-of-Departure estimation, the directions of the transmitting beacons are determined on the asset. If the asset knows the position of the beacons, it can instantly calculate its position from all the estimated angles, and there is no need for a central position estimator device, as shown in the following figure.