Abstract

Modern vehicles are moving from domain-based electrical architectures to zonal and central compute architectures, where data from multiple radar sensors is combined at a central processor and used for sensor fusion, distributed aperture radar, and advanced driver assistance. This shift places new demands on the Ethernet links that carry radar data. The link must distribute a precise, nanosecond-accurate time base so that every sensor captures data at the same moment, and the link must protect that data so that a central perception stack can trust the data received.

This white paper explains how two IEEE standards built into the Ethernet physical layer (PHY) address these needs in automotive radar applications. IEEE 802.1as (gPTP) provides time synchronization, while IEEE 802.1ae (MACsec) provides protection against spoofing, tampering, and eavesdropping attacks.