Sugar Tree radar

{{Short description|Over-the-horizon radar built by the US in the 1960s}}

Sugar Tree is the name of a bistatic over-the-horizon radar built by the US in the 1960s.{{Cite book

|title=Advances in Bistatic Radar

|first=Nicholas J. |last=Willis

|first2=Hugh |last2=Griffiths

|year=2007

|isbn=9781891121487

|publisher=SciTech Publishing

|pages=54–55

}}Chong Sze Sing, 2014. Thesis submitted to the Naval Postgraduate School, Monterey, CA. "Passive multistatic detection of maritime targets using opportunistic radar". The key idea in Sugar Tree was a reinvention of the Klein Heidelberg Nazi German passive radar system developed for use in the Second World War. Sugar Tree was a "covert hitchhiker using Soviet, surface-wave HF radio broadcast signals and a remote sky-wave receiver to detect Soviet ballistic missile launches". The key idea, in other words, is to receive radar reflections without oneself transmitting a radar signal by using instead some other signal, typically one that originates from the adversary. Willis, N & Griffiths, H (eds), Advances in Bistatic Radar, SciTech Publishing, Raleigh, NC 2007, cited in Willis & Griffiths " Klein Heidelberg – a WW2 bistatic radar system that was decades ahead of its time". http://www.cdvandt.org/K-H%20final.pdf