Latest Aircraft instruments Stories
An anticlockwise rotation of sea-surface height patterns has been observed near Norway’s west coast. Archived data from radar altimeters on the ERS-1, ERS-2 and Envisat satellites show the wave-like motion around the centre of the Lofoten Basin.
Scientists have gathered in the 'floating city' this week to talk about radar altimetry – measuring the heights of the global sea surface, freshwater bodies, land and ice using spaceborne sensors.
A radar altimeter measures altitude above the terrain beneath an aircraft as opposed to a barometric altimeter which provides the distance above a pre-determined datum, usually sea level. Radar is the underpinning principle of the system. Radio waves that are reflected back from the ground are timed in order to calculate speed, distance, and time which are related to the each other and can be used to calculate the distance from one point to another. Lloyd Espenschied invented the radar...
- A trick or prank.