A high precision clock has been developed for a balloon-borne experiment. In order to study a compact object such as a pulsar, we need the time information as well as the energy and the direction. The clock provides the precise time during the experiment with reference to UTC. It consists of a crystal oscillator on board and a rubidium oscillator backed up by GPS (Global Positioning System) receiver for the calibration on the ground. We have carried out balloon-borne hard X/γ ray observations in Barsil, 1991,with utilizing this clock. By the calibration, the clock operated with the stability of ～10^<-12> and the accuracy of 2μsec through the observation. It makes it possible to study an astronomical object by some kinds of detectors at the same time.
GPS を利用した気球実験用高精度時計システムの開発
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