Air traffic control radar images indicated that the aircraft appeared to be descending rapidly before disappearing from radar scopes at about 2000 ft of altitude.

Some fire control towers were also the mounting points for coast surveillance or fire control radar antennas.

This class of ships could be distinguished by the lack of fire control radar on the roof of the bridge.

The fire control radar was damaged, but was quickly returned to service.

A new radar system with a fire control radar on a 24 m extending boom reputedly enabled more accurate targeting of low-altitude planes.

Pilots earn up to $25,000 per flight, crossing a poorly patrolled border with no radar coverage.

The pilot, who was apparently flying without a co-pilot, requested to be advised on other air traffic, but was told that he was below their radar coverage.

We were at a very low altitude, but because we had returned to radar coverage he hoped against hope that maybe we had regained use of one of our engines.

This did not apply to the air-defence radar coverage, which guarantees 24/7 peacetime operational capacity.

All aircraft within the carrier's radar coverage (typically several hundred miles) are tracked and monitored.

Vehicle speed and radar measurement are rarely the same for this reason.

Scientists have developed software which analyses radar measurements to create a three-dimensional 'mosaic' of cloud regions.

As with all radar measurements, these rely on measuring the time taken for photons to be reflected from an object.

Although radar measurements do not detect visible light they can determine the distance and size of an object with a high degree of accuracy.

Satellite and radar measurements, e.g. of tornadoes, hurricanes, and air currents in the upper atmosphere, do not compete with records for surface measurements.

Quill launched in 1964, was the first radar satellite, essentially a prototype.

Radar satellites can locate vessels in a far larger area than can aircraft, but have little or no ability to characterize the vessel.

Radar satellites recorded the heights of tsunami waves in deep water: at two hours after the earthquake, the maximum height was 60cm ft.

It will consist of 3 radar satellites and one optical satellite.

Radar scans appear to show two large houses and an unusually-shaped third building.

These can be picked up on detailed radar scans as well as interference from long-distance lightning strikes.

Modern radar scans many angles around the site.

Clutter tends to appear static between radar scans; on subsequent scan echoes, desirable targets will appear to move, and all stationary echoes can be eliminated.

Their design minimises sharp angles, vertical surfaces and deck clutter to reduce this 500ft vessel's radar signature to the size of a fishing trawler.

With its matt-finish paint and carbon fibre body it looks like it should have the radar signature of a paper clip.

The ship features a low point design and combines this with radar absorbing paint to reduce radar signature.

Echo made it possible to predict the radar signature an aircraft made with flat panels, called facets.

Target analysis and radar signature identification help identify and track friends or foes.

A radar station sits atop one of the few hills and local people say that the aircraft would deliberately fly low to test their systems.

Other trails lead to an abandoned radar station and a coastguard lookout.

There was a similar scene at an army barracks raided by soldiers searching for a mobile radar station.

An array of inflatable mock-ups has been created, ranging from a rocket launcher to a radar station.

Operational service testing of the circular surveillance radar station has also been completed.

Technicians spent two years reducing the weight of the radar system from 100kg to a manageable 4kg for the polar expedition.

Shortly afterwards its radar system detected a large aircraft flying at high altitude.

Then retro rockets that act as braking engines, and a radar system, will guide the rover to a soft landing.

The craft were seen on a new radar system that was being installed in fighter jets at the time.

Operators typically use a radar system mounted alongside the laser to detect airplanes that might stray into the area and automatically shut down the laser.