User:Barkercoder/sandbox: Difference between revisions

Revision as of 08:52, 28 April 2025

Revision as of 08:53, 28 April 2025

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During the post-war period, British radar research continued at institutions such as the [[Signals Research and Development Establishment]] (SRDE) and the [[Radar Research Establishment]] laterly known as the [[Royal Radar Establishment]] and [[Telecommunications Research Establishment]], Malvern. In 1953, an English physicist [[Ronald Hugh Barker]] was instrumental in the practical applications of [[pulse-code modulation]] (PCM), particularly in telemetry for guided weapons and early digital radar but most notably for the invention of the [[Barker code]] in 1953. Barker code is a binary sequence with ideal autocorrelation properties for minimising range side lobes in pulse compression radar and telemetry. Barker, R. H. (1953). “Group Synchronisation of Binary Digital Systems.” In ‘‘Communication Theory’’, edited by W. Jackson, London: Butterworths, pp. 273–287. His work also anticipated features of modern air traffic control systems, speech encryption and rotary encoders.

Barker’s work on PCMdata transmission paralleled and complemented earlier research by American engineers such as [[Alec Reeves]], who had first proposed PCM in 1937, and [[Claude Shannon]], whose theoretical advances after World War II laid the foundation for digital communications. Also, Alec Reeves, “Electric Signaling System,” UK patent GB538428A, filed 1937 and Shannon, Claude E. “A Mathematical Theory of Communication,” ‘‘Bell System Technical Journal’’, vol. 27, 1948.