40th Annual Frequency Control Symposium - 1986

A disciplined oscillator has been developed to combine the short-term frequency stability of a rubidium atomic oscillator with the long-term timekeeping ability of the Global Positioning System (GPS). A digital control loop is used to reduce the temperature sensitivity of the rubidium frequency standard, to provide frequency and time referenced to UTC and to make possible improved time prediction during periods when the GPS time reference is not available. Performance data for Efratom's Model RGR Disciplined Rubidium Oscillator are presented. The design approach is described in sufficient detail so that it may be applied in other situations.