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Doppler Shift Tolerance of Typical Pseudorandom Binary Sequences in PMCW Radar.

Lucas Giroto de Oliveira1, Theresa Antes1, Benjamin Nuss1

  • 1Institute of Radio Frequency Engineering and Electronics (IHE), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany.

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Summary

This study analyzes pseudorandom binary sequence (PRBS) performance in phase-modulated continuous wave (PMCW) radar for autonomous driving. It evaluates Doppler shift tolerance of PRBSs using key metrics, crucial for reliable radar operation.

Keywords:
Doppler shiftperiodic autocorrelation functionphase-modulated continuous wavepseudorandom sequenceradar

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Area of Science:

  • Radar Systems Engineering
  • Signal Processing
  • Autonomous Driving Technology

Background:

  • Phase-modulated continuous wave (PMCW) radar using pseudorandom binary sequences (PRBSs) is a key technology for autonomous driving.
  • PMCW radar offers advantages like simplified transmitters and high velocity unambiguity compared to other digital radar schemes.

Purpose of the Study:

  • To analyze the Doppler shift tolerance of PRBSs' periodic autocorrelation functions (PACFs) in PMCW radar systems.
  • To evaluate the impact of Doppler shifts on PRBS PACF performance for reliable radar operation.

Main Methods:

  • Simulations and measurements were used to assess the Doppler shift tolerance of commonly used PRBSs.
  • Key metrics including peak power loss ratio (PPLR), peak sidelobe level ratio (PSLR), and integrated-sidelobe level ratio (ISLR) were employed to quantify performance degradation.
  • Oversampled PACFs were analyzed to account for targets at arbitrary ranges.

Main Results:

  • The study quantifies the degradation of PRBS PACFs under various Doppler shifts.
  • Performance metrics (PPLR, PSLR, ISLR) reveal the robustness of different PRBSs to Doppler effects.
  • Analysis of oversampled PACFs provides insights into performance for non-ideal target ranges.

Conclusions:

  • The choice of PRBS is critical for maintaining PMCW radar performance under Doppler shifts.
  • Accurate characterization of Doppler tolerance is essential for designing reliable autonomous driving radar systems.
  • The findings support the selection of optimal PRBSs for robust PMCW radar applications.