Automotive Radar Sensors – RF Signal Analysis and Inference Tests

By Rohde & Schwarz

In the automotive radar market, high performance and reliability together with low-cost unit prices are mandatory. The radars shall also not interfere with each other or any other device. It follows that test and measurement of these radar sensors need to be just as fast, reliable, cost-effective and straight forward as development and production.

As a matter of the underlying physical principle, signals transmitted via radio frequency (RF) systems can be distorted by other RF systems transmitting at the same time. If such radio frequency interferences (RFI) happen, the functionality of a system can suffer severely and it may react unpredictably. The likelihood of interference depends for example on the used frequency bands of the systems (e.g. 77 GHz or 24 GHz band for automotive radar), the distance between the individual transmitters (e.g. many cars in front of each other), the waveform (chirp rate, timing, receiver bandwidth and filter stages) and the emitted power. The worst scenario of this interference would be the creation of artificial ghost targets, the malfunction of the automotive sensor or a blind automotive sensor. This application note covers the theoretical background of automotive radar signals, the analysis of those signals and the test and measurement solutions provided by Rohde & Schwarz. Furthermore, a measurement setup is shown to also address radio…

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