GPS Outage Handling: Dead Reckoning and Localization Continuity
Project DRIVE · Localization
How inertial and vehicle-motion inputs can bridge a GPS gap—and why estimation uncertainty grows with time.
GPS accuracy depends on satellite geometry, signal blockage, atmospheric conditions, receiver design, and the user environment. Buildings, bridges, trees, tunnels, and multipath can reduce availability or accuracy. [1]
Dead reckoning
When an external position update becomes unavailable, a system can propagate its last state using wheel speed, steering, yaw rate, acceleration, and an inertial model. Map information may further constrain the estimate. [3]
Uncertainty must grow
Dead reckoning is not a permanent replacement for GPS. Sensor bias and model error accumulate, so the estimated covariance or confidence should reflect increasing uncertainty. When reliable external measurements return, the estimator must reconcile them without creating an unstable jump.
References
This independent educational article is not an OEM procedure, diagnosis, repair instruction, calibration specification, legal requirement, or certification of system performance. Vehicle-specific manufacturer information and qualified professional judgment control the actual service decision. Repository publication does not by itself mean peer review or endorsement.
Sainath Reddy Puchakayala
Automotive Engineer, ASE L4-Certified ADAS Professional, and Licensed Massachusetts Motor Vehicle Inspector based in Lowell, Massachusetts. His work connects vehicle diagnostics, electronics, hybrid and EV technology, inspection practice, and systems-level engineering. He independently developed Project VISION to advance careful ADAS awareness, documentation, communication, and appropriate referral without replacing vehicle-specific OEM procedures.