Hartmann, I.I.HartmannVietze, L.L.Vietze2022-03-082022-03-081992https://publica.fraunhofer.de/handle/publica/302630Device for the measurement of the pitch and roll angle and the height above the road surface of vehicles, whereby ultrasonic sensors are arranged at least on the vehicle floor so that they form a plane between them.de608004patent1991-4117540