Real-time road grade, slope and elevation measurement using differential pressure apparatus and method

摘要

An apparatus includes a hermitically sealed rigid vessel, a differential pressure sensor, and a controller. The differential pressure sensor measures a difference between ambient pressure in a vicinity of the vessel and internal pressure in the vessel, and outputs a signal indicative of the difference. The controller computes a change in elevation of the apparatus between a first location and a second location based on a value of the signal associated with the first location and a value of the signal associated with the second location.