I've just noticed a BBC news story on the installation of QinetiQ's Tarsier® radar at Heathrow airport. It is apparently so good that it could notice a cotton reel on a runway, using high resolution, hence of course reducing the chances of airplanes hitting debris.
There are two Patent Cooperation Treaty applications from the company using the word "debris" in their summaries. These are Frequency modulated continuous wave (FMCW) radar having improved frequency sweep linearity , whose main drawing is shown below, and Coherent frequency modulated continuous wave radar.
I can't say it means much to me but it adds a lot to the BBC story for electronics engineers, at least.
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