Automotive & motorsport
(radar in the loop, Fig. 6, bottom), allowing real data to be used. An arc-shaped radar-reflecting wall of cascaded R&S QAT100 units is set up in front of the chassis dynamometer. The number of units depends on the desired angular coverage and angular resolution. The number of R&S AREG800A digital backends required depends on the complexity of the scenarios to be simulated. A fully equipped R&S AREG800A simulates up to eight targets that can be distributed to up to eight R&S QAT100 units. Individual targets can be transmitted over the entire R&S QAT100 chain, i.e. across a broad azimuth range. For very dense scenarios, each R&S QAT100 uses an R&S AREG800A of its own (Fig. 7). Sometimes it is necessary to simulate situations in
Fig. 5: The R&S AREG800A and R&S QAT100 enable realistic radar tests on a chassis dynamometer using virtual scenarios of almost any complexity.
192 transmit antennas in two rows with eight arrays for simultaneous simulation of up to eight targets.
Conventional frontends also possible
For tests that do not require the flexibility of the R&S QAT100, such as scenarios without tangential motion or measurements in a test chamber, up to four R&S AREG millimeterwave remote frontends can be used with the R&S AREG800A instead of the R&S QAT100 (Fig. 2). Each of these frontends can emit up to eight echoes in a fixed direction in response to a radar signal. This can be necessary to simulate a set of targets at different distances, such as pedestrians or cyclists in front of a truck. Up to 32 targets in total can be simulated with this setup.
new: live sCenarios in vil test setups
For testing individual radar sensors in development or production, Rohde & Schwarz provides compact shielded chambers such as the previously mentioned R&S ATS1500C or – specially developed for the R&S QAT100 – the R&S QAT-Z50 mini shielded chamber for the lab bench (Fig. 4). Testing the radar functionality of an entire
vehicle is naturally a lot more complicated. For this, a large RF shielded test chamber with a chassis dynamometer is needed (Fig. 5). Complete system tests, however, were previously only possible to a limited extent due to the lack of suitable over-the- air test equipment. Instead, the ADAS control unit was usually fed with simulated sensor data (Fig. 6, top). This required accurate acquisition of the environment by the sensors. The new R&S test system includes the radar sensors in the test
which a target moves not only in a plane, but also in height. An overpass approach road is a typical scenario. For such cases, the R&S QAT100 can be tipped 90 degrees and operated lying on its side.
summary
Many driver assistance systems, and in particular growing vehicle autonomy, depend on the reliable operation of more and more installed radar sensors. Previously only rudimentary testing of these sensors was possible. The new radar test system, consisting of an R&S AREG800A radar echo generator and an R&S QAT100 advanced antenna array, remedies this. Radar test environments with virtually any desired complexity can be set up with this modular system. It can be used along the entire development and validation path of sensors and radar based ADAS, including vehicle-in-the-loop tests of complete vehicles on a chassis dynamometer. As a result, the system makes an important contribution to the safety of future vehicle generations.
Rohde & Schwarz
www.rohde-schwarz.com
Fig. 6: In the past, radar based ADAS were mainly tested in vehicle-in- the-loop setups using simulated scenarios with the radar sensors out of the loop (top). The target data was provided by a scenario simulator. The R&S AREG800A and R&S QAT100 allow the radar sensors to be included in the test loop (radar in the loop).
Instrumentation Monthly February 2022
Fig. 7: The number of necessary R&S AREG800A and R&S QAT100 units depends on the number of targets and their spatial density, as well as the angular range to be covered.
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