Pressure reference system

Nowadays the trend of the modern navigation is to integrate[3] signals from IMU together with data provided by Global Positioning System (GPS).

This approach gives long term stability to the INS output by suppressing sensor error influence on the calculation of the airplane position.

The sensors used within AHRS are used only for position angles determination and so just one numerical integration of the angular rate measurements is required.

It is shown in an experimental research report,[4] where the output of the navigation solution drifts away after 2 seconds.

The concept of the PRS was defined by Pavel Paces in his PhD thesis[6] where results measured under laboratory conditions were also published.