Automotive & motorsport
steps over an angular range corresponding to the tangential speed of the simulated objects. Both instruments can be cascaded to create test situations of virtually any desired complexity. It is even possible to achieve 360- degree azimuth coverage and height profiles.
Small-Scale and large-Scale modularity
The system can be configured precisely for specific test requirements. The instruments themselves can be equipped with options for different scenarios. In the minimal configuration with one baseband module, the R&S AREG800A simulates a single dynamic target. Four modules can be fitted to simulate up to eight targets when the R&S AREG800A is operated with the R&S QAT100 as a frontend. Because of the signal processing time, digital
echo generators have a certain latency that takes the form of a blind zone or minimum target distance. With the R&S AREG800A, the distance is nearly 17m. For short-range scenarios, such as testing emergency braking assistance systems, graduated analog delay lines for distances to below 4m can be added. The radar does not notice the transition from digital to analogue delay.
Fig. 4: The R&S QAT-Z50 shielding system allows the R&S QAT100 to be used in a normal lab environment. The radar sensor is mounted at the opposite end.
HigH-reSolution azimutH range
Fig. 3: In combination with the R&S QAT100, the R&S AREG800A can simultaneously simulate eight targets using freely definable 4D data (direction, distance, size, speed) within the system limits and send their echoes back to the radar. With suitable configuration, a target can be moved in fine steps over the entire angle range of an antenna row. The front of the R&S QAT100 is covered with stealth material so it does not appear as a radar target.
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The R&S QAT100 advanced antenna array is an innovative RF frontend for the R&S AREG800A. It processes radar signals with up to 4GHz bandwidth in the frequency range from 76GHz to 81GHz. In the base configuration, an instrument contains 96 transmit antennas arranged in a row with a spacing of 3.7mm, internally divided into four arrays. The R&S AREG800A can feed a separate echo to each array (Fig. 3). For a target without a tangential motion component, the echo is emitted by a single, arbitrarily selectable antenna, but for a target moving tangentially the echo travels along the row. The four antenna arrays of a row can also be coupled to use the full width of the instrument for broad target motions. The previously described configuration can optionally be doubled, giving the R&S QAT100 a total of
February 2022 Instrumentation Monthly
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