Autonomous vehicles rely on precise positioning, navigation, and timing (PNT) information. Although traditional commercial wired and wireless communication systems were not designed for this role, they can be incorporated into existing systems using lidar, global navigation satellites, and camera and computer vision systems. The wireless and, eventually, the wired systems provide signals of opportunity that allow for improvements and more accurate PNT solutions. Like any information traversing a physical layer, the transmitted signals face multipath channels with random behavior that should be modeled appropriately statistically.