Method for determining at least one object information of at least one object which is detected by a radar system, in particular of a vehicle, radar system and driver assistance system

摘要

A method for determining at least one object information of at least one object (18) which is detected by a radar system (12), in particular of a vehicle (10), a radar system (12) and a driver assistance system (20) having a radar system (12) described. In the method, transmission signals (32a, 32b) are transmitted to a monitoring area (14) of the radar system (12) with at least one transmitter (26a, 26b). With at least one receiver (30a, 30b) reflected echoes of the transmission signals (32a, 32b) are received at the at least one object (18) as received signals (34a, 34b) and, if necessary, in an electronic control and / or evaluation device ( 28) usable form brought. The received signals (34a, 34b) are subjected to at least one two-dimensional discrete Fourier transformation. From the result of the at least one two-dimensional discrete Fourier transform at least one target signal is determined from the at least one target signal at least one object information is determined. On the transmitter side, at least one first transmit signal (32a) and at least one second transmit signal (32b) are generated from a frequency-modulated continuous wave signal so that they can reach the at least one object (18) with different amplitudes and be reflected by it. The at least one second transmit signal (32b) is coded by means of a phase modulation with respect to the at least one first transmit signal (32a) such that an at least temporary signal orthogonality is achieved between the at least one first transmit signal (32a) and the at least one second transmit signal (32b) , The at least one first transmission signal (32a) with at least one first transmitter (26a) and the at least one second transmission signal (32b) are simultaneously transmitted with at least one second transmitter (26b) into the monitoring area (14) of the radar system (12). On the receiver side, from the result of the at least one two-dimensional discrete Fourier transform, a plurality of target signals whose number per physically existing target corresponds at most to the total number of the first and second transmit signals (32a, 32b) and their respective amplitudes are determined. The target signals are respectively assigned to the transmission signals (32a, 32b) according to a magnitude of the respective amplitudes, and thus at least one of the target signals is validated. At least one object information is determined from at least one validated target signal.