Abstract: A portable sensor system is provided for detecting objects in the environment of the portable sensor system and for being temporarily attached to a mobile object. The portable sensor system includes an environment detection sensor for detecting objects, an attaching device connected to the environment detection sensor for temporarily attaching the portable sensor system to an external surface of the mobile object, and a position determining apparatus for determining a sensor position of the environment detection sensor when the environment detection sensor is attached to the external surface. The position determining apparatus is configured to determine the sensor position relative to the mobile object on the basis of a predetermined geometrical model of the external surface and a region of the external surface detected by the environment detection sensor.

Abstract: A method for monitoring an object (20) in the environment of an aircraft (10) on the ground (2), having the steps of: transmitting a communication signal between a communication device arranged on the object (20), in particular a land vehicle, and at least one communication device spatially allocated to the aircraft (10) on the ground (2), and determining spatial location information relating to the object (20) on the basis of the transmitted communication signal. In addition, a device having an interface which is configured to read in data based on the communication signal transmitted between the communication devices, and a determination unit which is configured to determine spatial location information relating to the object (20) on the basis of the data which have been read in. Furthermore, a system for monitoring an object (20) in the environment of an aircraft (10) on the ground (2), having such a device.