Multipath interference occurs when GNSS (Global Navigation Satellite System) signals, such as those from GPS, reach the receiver via multiple paths. Instead of traveling directly from the satellite to the receiver, some signals bounce off of nearby surfaces (buildings, trees, the ground) before arriving. These reflected signals travel a longer distance, causing a delay and distortion of the signal. This interference degrades the accuracy of the UAV's position calculation. Several techniques can be employed to mitigate the effects of multipath interference. One method involves using antennas with good signal selectivity and multipath rejection ....
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