The Royal Signals and Radar Establishment (RSRE) was a scientific research establishment within the Ministry of Defence (MoD) of the United Kingdom. It was located primarily at Malvern in Worcestershire, England. The RSRE motto was Ubique Sentio (Latin for "I sense everywhere").
History
225px|thumb|right|Queen Elizabeth II and Prince Philip visiting RSRE in 1976.
RSRE was formed in 1976 by an amalgamation of previous research organizations; these included the Royal Radar Establishment (RRE), itself derived from the World War II-era Telecommunications Research Establishment, the Signals Research and Development Establishment (SRDE) in Christchurch, Dorset, and the Services Electronic Research Laboratory (SERL) at Baldock. "Costs were recovered from vote 2, the Treasury allocation to the Ministry of Defence for equipment, and ... was subject to cash limits within each tax year."
Beginning in 1979, the SRDE and SERL moved to Malvern to join the RRE's location. RSRE was involved in the design and testing of Skynet 4 and its ground facilities and terminals.
Contributions to computer science made by the RSRE included ALGOL 68RS (a portable implementation of ALGOL 68, following on from ALGOL 68R developed by RRE), Coral 66, radial basis function networks, hierarchical self-organising networks (deep autoencoders), the VIPER high-integrity microprocessor, the ELLA hardware description language, and the TenDRA C/C++ compiler.
RSRE was an early researcher of TCP/IP in Europe, along with Peter Kirstein's group at University College London and NDRE in Norway. The first email sent by a head of state was sent from the RSRE over the ARPANET by Queen Elizabeth II on 26 March 1976. RSRE was allocated class A Internet net 25 in 1979, which later became the Ministry of Defence address space, providing 16.7 million IPv4 addresses.
"This 'technology base' has fed work on complete systems, not only in RSRE but in most other defence establishments and in industry", the main ones being "airborne, battlefield and ground radar, optoelectronics, guided weapons, ground-based communications and air traffic control," but "it has mainly been known for its work on enabling technologies that can be applied to underpin systems development."