LiDAR Sensors Face Power-Line Noise That Can Degrade Perception Performance

The article explains that LiDAR units combine precision analog sensing, high-speed digital processing, laser pulse generation, and timing circuits in one compact housing, making them sensitive to electromagnetic interference. Power-supply noise can alter receiver thresholds, timing references, and clock stability, so electrical faults may appear as perception errors. The author argues the LiDAR power input should be treated as an EMC interface, since switching ripple, transients, and ground shifts from robot components like motor inverters and relays can reach the sensor. Conducted noise travels through both differential and common-mode paths, and pulsed laser current draw can also feed noise back into the robot's power network. Because source impedance and cable routing strongly influence these effects, filtering and layout decisions must be based on measured disturbances across the installed power path.