For the development of fully-autonomously driving vehicles, advanced capabilities for sensor systems are required. With modulation-based radar target simulators, complex traffic scenarios can be simulated for automotive radars at low costs. Yet the simulation principle relies on the timings of the chirp-sequence frequency modulated continous waveform. Since small timing variations can be purposely introduced on the radar's waveform e.g. for interference mitigation techniques, the assumption of ideal timings could be violated. Therefore, this paper investigates the influences of ramp timing deviations on the target simulation. A signal model for radar timing variations for modulation-based simulators is presented. Furthermore, the influence of ramp timings on the resulting signal-to-noise ratio of simulated target responses is derived and verified by measurements.
Increasing demands in radar sensor performance for automotive applications require reliable test solutions for the development and verification. In this paper, a modulationbased radar target simulator suitable for automotive settings is presented. A cost-effective circuit with low complexity is proposed that modulates the radar signal directly in the E-Band without an intermediate frequency stage. Models are derived for predicting the limitations of such radar target simulators due to hardware nonidealities. The introduced radar target simulator is analyzed with respect to the derived nonidealities in order to predict its performance based on the models. As a verification, radar measurements with the target simulator are conducted, and compared with the models' predictions.
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