Herbert P. Raabe

Herbert P. Raabe (born August 15, 1909 in Halle (Saale) ; † August 25, 2004 in Rockville (Maryland) ) was a German electrical engineer.

Life

His parents were Theodor Raabe and Katharina, geb. Cutter. He attended the Humboldt secondary school in Zeitz and then studied electrical engineering at the Technical University of Berlin, where he received his doctorate in 1939 with the dissertation Investigation of Time Multiplex Transmission . It presents the sampling theorem and its application to time division multiplex transmission. It was published in the journal Electrical Communication Engineering No. 16, pp. 213-228. He is therefore also considered the father of the digital sampling theorem. He became Wilhelm Stäblein's second assistant .

During the Second World War he developed radar technology at the Heinrich Hertz Institute for Vibration Science. Afterwards he lost his position as a member of the NSDAP in the course of the denazification of the universities and devoted himself to the development of a microfilm recovery system.

In 1940 he married Charlotte Lettau († 1952), with whom he had their son Wolfram († 1957). He later married Hildegard Zumbusch († June 17, 2009, in Potomac, MD), with whom he had four children.

In 1946 he worked at the Communications Institute of the Soviet Military Administration, where he developed an infrasound signaling and control system. He also proposed an electronic telephone switching system. From 1947, at the invitation of the US Air Force, he worked as a technical advisor to the Aerial Reconnaissance Laboratory at Wright-Patterson Air Force Base in Dayton, Ohio. His work included the development of an interferometer for the analysis of radar pulses of a common rotating waveguide for dual channels.

In 1956 he joined the electronics division of General Mills, Inc., which merged with Litton Industries in 1963. He developed novel radar technologies and electronic countermeasures (ECM), as well as passive communication satellites and optical sensors for the stabilization of satellites. In 1962 he presented his work on passive satellites on the XIII. International Astronautics Conference in Varna, Bulgaria.

From 1966 to 1974 he was employed at the IBM Federal Systems Division , where he worked on the novel ECM technology, on the analysis of radar echoes and on retro-directional antenna arrays. He also recommended a microwave landing system (MLS) for the space shuttle to NASA. In an international NASA competition, he proposed an instrument landing system (ILS), with which he won 1st place, which was not used.

From 1968 he lived in Potomac, Maryland . He was a member of the Institute of Electrical and Electronics Engineers, the American Aerospace Institute, and an honorary member of the Space Association. He received 19 patents and published 15 publications. After his retirement in 1974 he developed a new type of turntable tonearm.

Publications

• Characteristics of passive communication satellites with Lambertian surfaces ; NASA technical Note D-1841; September 1963 ( Online ; PDF; 2.9 MB)

literature

• HD Lüke: Herbert P. Raabe, the "father" of the sampling theorem ; In: Communications journal 1989
• PL Butzer, MM Dodson, PJSG Ferreira, JR Higgins, O. Lange, P. Seidler: Herbert Raabe's work in multiplex signal transmission and his development of sampling methods . In: Signal Processing . tape 90 , no. 5 , May 2010, p. 1436-1455 , doi : 10.1016 / j.sigpro.2009.11.018 .

Individual evidence

1. ↑ http://www.connectionnewspapers.com/article.asp?article=253020&paper=70&cat=104  ( page no longer available , search in web archives )  Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.  
2. ↑ http://boards.tiscali.ancestry.co.uk/surnames.raabe/167/mb.ashx

Web links

• http://www.nue.tu-berlin.de/menue/geschichte/historische_persoenitäten/raabe/