Wireless positioning principle: TOA&AOA

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Wireless positioning principle: TOA&AOA [Copy link]

TOA positioning method: TOA positioning method: It is mainly based on measuring the arrival time of the received signal between the base station and the mobile station, and then converting it into distance for positioning. This method requires at least three base stations to calculate the position of the target. The positioning diagram is shown in the figure. The distances measured by the three base stations from the MS are r1, r2, r3r1, r2, r3, and the distances measured by each base station are taken as the radius. Three circles are drawn, and their intersection is the position of the MS. When the three base stations are all LOS base stations, the estimated position of the MS can generally be calculated according to the least squares (LS) algorithm. Assuming that the MS position coordinates are (x,y)(x,y), and the position coordinates of NN BSs are (xi,yi)(xi,yi), according to their geometric meaning, the relationship between them is

AOA positioning method

AOA positioning method mainly measures the arrival angle between the signal mobile station and the base station. The ray formed with the base station as the starting point must pass through the mobile station, and the intersection of the two rays is the position of the mobile station. This method only needs two base stations to determine the estimated position of the MS, and its positioning schematic diagram is shown in the figure.

TOA/AOA hybrid positioning

When the base station can obtain TOA and AOA information at the same time, it is usually combined with the above formula to adopt the TOA/AOA hybrid positioning method, let

Similarly, use the LS algorithm to solve and get the position of the mobile station.