Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them. These points are usually on the surface of the Earth, and they are often used to establish maps and boundaries for ownership, locations, such as the designed positions of structural components for construction or the surface location of subsurface features, or other purposes required by government or civil law, such as property sales.
The Plessey Company plc was a British electronics, defence and telecommunications company. It originated in 1917, growing and diversifying into electronics. It expanded after World War II by acquisition of companies and formed overseas companies.
Direction finding (DF), or radio direction finding (RDF), is the use of radio waves to determine the direction to a radio wave source. The source may be a cooperating radio transmitter or may be an inadvertant source, a naturally-occurring radio source, or an illicit or enemy system. Radio direction finding differs from radar in that only the direction is determined by any one receiver; a radar system usually also gives a distance to the object of interest, as well as direction. By triangulation, the location of a radio source can be determined by measuring its direction from two or more locations. Radio direction finding is used in radio navigation for ships and aircraft, to locate emergency transmitters for search and rescue, for tracking wildlife, and to locate illegal or interfering transmitters. During the Second World War, radio direction finding was used by both sides to locate and direct aircraft, surface ships, and submarines.
An ionosonde, or chirpsounder, is a special radar for the examination of the ionosphere. The basic ionosonde technology was invented in 1925 by Gregory Breit and Merle A. Tuve and further developed in the late 1920s by a number of prominent physicists, including Edward Victor Appleton. The term ionosphere and hence, the etymology of its derivatives, was proposed by Robert Watson-Watt.
Sir Basil Ferdinand Jamieson Schonland OMG CBE FRS was noted for his research on lightning, his involvement in the development of radar during World War II and for being the first president of the South African Council for Scientific and Industrial Research.
A network analyzer is an instrument that measures the network parameters of electrical networks. Today, network analyzers commonly measure s–parameters because reflection and transmission of electrical networks are easy to measure at high frequencies, but there are other network parameter sets such as y-parameters, z-parameters, and h-parameters. Network analyzers are often used to characterize two-port networks such as amplifiers and filters, but they can be used on networks with an arbitrary number of ports.
The "Wadley-drift-canceling-loop", also known as a "Wadley loop", is a system of two oscillators, a frequency synthesizer, and two frequency mixers in the radio-frequency signal path. The system was designed by Dr. Trevor Wadley in the 1940s in South Africa. The circuit was first used for a stable wavemeter.
Durban High School is a public English medium high school for boys situated in the suburb of Musgrave in Durban in the KwaZulu-Natal province of South Africa.
The Evolutionary Studies Institute (ESI) is a paleontological, paleoanthropological and archeological research institute operated through the Faculty of Science of the University of the Witwatersrand, Johannesburg, South Africa. Previously known as the Bernard Price Institute for Palaeontological Research (BPI) it was renamed the Evolutionary Studies Institute in 2013 to better showcase the scope of its research.
The first significant work in astronomy in South Africa was performed by Nicolas Louis de Lacaille between 1751 and 1753, culminating in the measurement of the arc of the southern meridian and a catalog of almost 10 000 southern stars, later published as Coelum Australe Stelliferum.
Jacques Pierre Friederich (Friedel) Sellschop was a South African scientist and pioneer in the field of applied nuclear physics.
Radio-frequency (RF) engineering is a subset of electrical engineering involving the application of transmission line, waveguide, antenna and electromagnetic field principles to the design and application of devices that produce or use signals within the radio band, the frequency range of about 20 kHz up to 300 GHz.
The tellurometer was the first successful microwave electronic distance measurement equipment. The name derives from the Latin tellus, meaning Earth.
Ke Wu is a professor and researcher in electrical engineering. He currently works at the Ecole Polytechnique in Montreal, and is a Tier-I Canada Research Chair in radio-frequency (RF) and millimetre-wave engineering.
Thomas Price Stratten was a South African engineer. He went to Oxford on a Rhodes Scholarship, followed by two years at American General Electric. He returned to South Africa in 1929 to the position of assistant electrical engineer at De Beers Consolidated Mines. He took senior positions at Iscor, the Union Corporation and Escom. After a time spent in the Directorate of War Supplies, he went on to successfully expand SAPPI's operations and was president of the South African Institute of Electrical Engineers during the 1940s.
Jules Fejer was a Hungarian-born physicist.
Fulufhelo Vincent Nelwamondo (OMS) is an electrical engineer by training, and holds a PhD in Electrical Engineering from the University of the Witwatersrand, in South Africa. He is the youngest recipient of the Harvard-South Africa Fellowship Programme amongst other honours. His research and practical experience has covered a wide spectrum of areas, including software engineering and computational intelligence. His interests include biometrics-based systems, data mining and machine learning tools.
Jeff Collins was a British electrical engineer who directed and researched experimental physics, robotics, microelectronics, communications technologies and parallel computing.
