reference system

With this faulty directional information, it was not suitable as a reliable reference system for the ants' behavior to look back to the nest entrance during the learning walks.

According to the report, the false GPS signals were received by state-of-the art navigation systems called inertial reference systems, or IRS, that until now had been thought to be impervious to false GPS signaling.

To make various countries’ systems interoperable, reference systems will have to be agreed internationally, says Gramling.

It will replace reference systems from the 1980s that are slightly askew, having been derived from calculations that were done before the advent of supercomputers or global navigation satellite systems such as GPS.

By far the largest number of defects was related to discrepancies between the airplane’s two independent inertial reference systems, navigational and flight instrumentation drivers that are important to the safe completion of a flight.