Ultrasonic measuring system, means of transportation and method for operating an ultrasonic transmitter-receiver device

An ultrasonic transmitter-receiver emits a signal representing a code word from an ultrasonic sensor 100 and another signal from another ultrasonic sensor 200 as part of a measuring cycle. Both sensors belong to the same group of ultrasonic sensors. A third ultrasonic sensor receives echoes from the two signals 300 and distinguishes components from the two ultrasonic sensors by decoding the codeword contained in one of the signals 400. The device is particularly suited as a parking aid for a car. The sensors belonging to the same group may be spatially arranged to receive cross echoes from each other. The other signal may represent another codeword. The codeword may be made of a time signal portion which is distinguished by matched filtering and successive code words may be distinguishable from one another by frequency related parameters. A third signal may be emitted representing a third codeword 500, from the original sensor as part of a second measuring cycle and/or a fourth signal representing the original codeword may be emitted from a third ultrasonic sensor.