User:Barkercoder/sandbox

History of RADAR 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 PCM 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.

PCM Barker contributed specifically to practical PCM encoding techniques, reflected in his patents on electrical pulse-code modulation.Barker, Ronald H. ‘‘Electrical Pulse Code Modulation’’. UK patent GB662338A. Filed January 8, 1951. Published December 5, 1951. Available online.Barker, Ronald H. ‘‘Electrical Pulse Code Modulation’’. US patent US2730676A. Filed January 8, 1951. Issued January 10, 1956. Available online. His later work also included developments in PCM encoder design for radar and telemetry systems.Barker, Ronald H. ‘‘Pulse Code Modulation Encoder’’. US patent US3721318A. Filed November 17, 1971. Issued March 20, 1973. Available online.

PCM

His work on electrical pulse-code modulation systems 1952 Group Synchronising of Binary Digital Systems 1955 GB706687 (A) Electrical Signal Generating Systems IET