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# uwb安装说明：
地图坐标系与小车坐标系重合，小车起始点为坐标系原点，使用三个标签分别是A，B，C。A放置在充电桩处。车上放置基站M。通过基站到三个标签的距离获得小车的位置信息。如图所示：
注:为了方便，人为设定UWB坐标系与地图坐标系和小车坐标系均重合。
小车半径：a
标签高度：h
BC标签距离d