Evaluation of mini-BVA resonators for space applications: tests program and results

There is a growing need for ultrastable quartz oscillators operating under the special environmental conditions usually required in space program applications. This is the case for radiocommunications, navigation, precise positioning and scientific programs especially in the case of satellite applications. Under those conditions an evaluation program based on general rules ESA/SCC has been launched in 1992 for precise space evaluation of mini-BVA resonators. A special Process Identification Document (PID) has been established which includes fabrication processes and test procedures. 21 resonators have been fabricated according to the proposed PID. Then a test program has been defined and resonators have been space evaluated with interesting results which are discussed. Finally, it appeared that performances goals have been obtained. In conclusion special resonators can be fabricated by LCEP with guaranteed performance.