How do computers improve dead reckoning in modern navigation systems?

Computers have significantly enhanced dead reckoning by automating the processing of complex data streams—including direction, speed, and time—to provide continuous, real-time positional updates.1

Integration and Processing

Modern systems utilize digital computers to perform rapid, near-instantaneous calculations. These computers integrate inputs from various sensors, such as gyrocompasses, compasses, and Doppler-effect speed measurements. In inertial guidance systems, computers process electrical signals from accelerometers to calculate distance and direction through successive integration.12

Advanced Techniques

To improve accuracy, many systems employ Kalman filtering, a mathematical technique that weights multiple data sources based on their expected quality to determine the best estimate of a craft's position and velocity. Furthermore, computers can combine these classical dead-reckoning inputs with external data from radio navigation systems like loran or the global positioning system, effectively narrowing the gap between dead reckoning and continuous position fixing.13