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Submission + - Britain Could Switch Off Airport Radar And Release Spectrum (techweekeurope.co.uk)

judgecorp writes: "Britain is considering switching off air traffic control radar systems and using "passive radar" instead. A two year feasibility study will consider using a network of ground stations which monitor broadcast TV signals and measure echoes from aircraft to determine their location and velocity. The system is not a new idea — early radar experiments used BBC shortwave transmitters as a signal source before antenna technology produced a transceiver suitable for radar — but could now be better than conventional radar thanks to new antenna designs and signal processing techniques. It will also save money and energy by eliminating transmitters — and release spectrum for 5G services."
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Britain Could Switch Off Airport Radar And Release Spectrum

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Be careful when a loop exits to the same place from side and bottom.