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The future satellite positioning/navigation systems (both GPS and Galileo) will provide civil signals on multiple frequencies, similar to that currently available only for military use. The multiple distinct frequencies will provide many advantages to users of the navigation systems. This paper presents a direct RF sampling front end design well suited for multiple frequency satellite navigation receiver design. No frequency down conversion is necessary, rather the particular frequency bands of interest are intentionally aliased using a wide band ADC. The resulting samples are passed, via a doubling buffering FPGA design, to the memory space of a host PC for storage as well as eventually processing of the multiple frequency transmissions. This paper describes the design of the front-end, validates its concept with collected data, and discusses the variations on the design of a generic multiple frequency GPS front end. ; Godkänd; 2002; 20061024 (ysko)

Interview with RF 'Pik' Botha, conducted 13th December 2012 in Pretoria, South Africa, as part of the Commonwealth Oral History Project. The project aims to produce a unique digital research resource on the oral history of the Commonwealth since 1965 through sixty oral history interviews with leading figures in the recent history of the organisation. It will provide an essential research tool for anyone investigating the history of the Commonwealth and will serve to promote interest in and understanding of the organisation. Biography: Botha, Roelof Frederik 'Pik'. 1932- . Born in Rustenburg, Transvaal Province, Union of South Africa. Studied at the University of Pretoria before beginning a career in the South African foreign service, 1953, serving in Sweden, West Germany, and the Netherlands. Law Adviser to Department of Foreign Affairs, 1966-74, serving on the delegation representing South Africa at the United Nations. South African Ambassador to the United States, 1975-77. South African Minister of Foreign Affairs, 1977-94. Minister of Mineral & Energy Affairs, 1994-96. Deputy Leader of the National Party in Transvaal, 1987-96.