Adaptive radar systems make driver assistance more efficient
Driver assistance systems must function reliably in a wide variety of traffic conditions: In the city, for example, they have to recognize many different targets against a very heterogeneous background; on the highway, they have to recognize targets at high speed and at great distances. Automotive radars must be able to adapt to these changing conditions in order to precisely determine distances and distances, relative speed and target position in any situation and to detect several different targets in the relevant environment.
adaptive automitive radar system
Cognitive radars intelligently adapt their operational parameters such as channel selection, bandwidth and carrier frequency as well as length and number of measurements to the circumstances and task. A challenge for the spatial resolution is above all the channel selection for the position determination. Here, the accuracy depends on the length of the antenna array. The longer, i.e. the more antenna elements, the more accurate it becomes. However, this requires more transmit and receive channels at adequate distances and entails higher costs and a correspondingly large amount of data that has to be processed in real time.
Fraunhofer FHR has developed a MIMO radar that adaptively perceives the radar scene and predicts the new position of the radar target with high accuracy from previous measurements using special algorithms. With these predictions, the controller adaptively selects only the 4 to 6 receiver and transmitter channels required for the next measurement from a MIMO array with 32 virtual channels. This allows exact position determination to be achieved in real time, even with a comparatively small and less expensive system with a lower data volume. The results of each new measurement are included in the calculations for the next measurement according to the close-loop principle. In this way, the radar system learns to continuously improve its adaptive strategy depending on the situation and to generate an optimal picture of the radar scene.
The scientists presented their cognitive radar demonstrator at the European Microwave Week EUMW in Madrid.
If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :
