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Pedestrian Dead Reckoning (PDR) – An Introduction

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Dead-reckoning is the term given to approximate one’s current position based on estimated movements from a previously known location. That is, having your starting point coordinates, then estimating heading (direction) and distance travelled between each change in direction, using velocity and time, to calculate where you are now. Imagine that you are driving a car and using a GNSS satellite navigation system then enter a tunnel with curves and straight sections that emerges into a street that is closely bordered by tall buildings. In this imaginary scenario, your navigation system loses GNSS signals when entering the tunnel and upon leaving the tunnel, GNSS is blocked or reflected off the buildings so you still do not have an absolute position fix. So, where are you? If your car sat-nav is also an inertial navigation system (INS), it can give you an idea of your position based on your car’s dead-reckoned motion through the tunnel and out into the street. A modern INS will typically us

Dead-reckoning is the term given to approximate one’s current position based on estimated movements from a previously known location. That is, having your starting point coordinates, then estimating heading (direction) and distance travelled between each change in direction, using velocity and time, to calculate where you are now. Imagine that you are driving a car and using a GNSS satellite navigation system then enter a tunnel with curves and straight sections that emerges into a street that is closely bordered by tall buildings. In this imaginary scenario, your navigation system loses GNSS

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