The United States space agency already uses an Aircraft Birdstrike Avoidance Radar at the Kennedy Space Center in Florida.

VOA: special.2009.04.01

It would replace existing radar networks that currently monitor that part of space.

VOA: standard.2010.07.24

The measurements were recorded via a radar altimeter onboard the European Space Agency's (Esa) Envisat satellite.

BBC: Arctic ice thickness 'plummets'

Another article revealed Chinese interest in airborne and space-based synthetic aperture radar.

CENTERFORSECURITYPOLICY: Center for Security Policy | Chinese Information Warfare: A Phantom Menace or Emerging Threat? | Page: 9

Space debris is tracked by the United States Space Surveillance Network that uses radar that can detect an object the size of a pea at 400 miles.

BBC: By BBC News Online Science Editor Dr David Whitehouse