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History Update

History Update

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Advances in Bistatic Radar — Recommend this title to your library

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Radar was first patented and demonstrated in 1904 by the German engineer Christian Hülsmeyer. As is well documented, his telemobilskop used a special spark-gap transmitter operating on a 40-50-cm wavelength and a separate receiver that rang a bell when detecting ships up to 5 km from the receiver. The first fully documented demonstration of the telemobilskop was in Cologne, in May 1904, with both the transmitter and receiver located on a platform under the Rhine Bridge (a chain suspension bridge destroyed during World War II) in a monostatic configuration to detect ships on the Rhine River. Purists might argue that Hülsmeyer's telemobilskop was not a radar because it did not directly measure range, as in 'radio detection and ranging,' and technically they would be correct. However, his invention included the essential elements of a radar, all reduced to practice: antennas, transmitter, receiver (with adequate shielding), and indicator, in this case an audio alarm to signal when a target was sufficiently close in range to require attention. More sophisticated indicators would have to await the development of timing circuits and displays.

Chapter Contents:

  • 2.1 Beginnings
  • 2.2 First Resurgence
  • 2.3 Second Resurgence
  • 2.4 Third Resurgence
  • References

Inspec keywords: patents; radar transmitters

Other keywords: audio alarm; wavelength 40 cm to 50 cm; patent; timing circuit; ship detection; spark-gap transmitter; radar; telemobilskop; chain suspension bridge; Rhine Bridge

Subjects: Radar equipment, systems and applications

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