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A study on Frequency Stability of High Precision Oscillator using GPS Tomoki Shioda, Non-member (Nihon University), Kunihiko Manju, Member (Nihon University), Hideo Otsuka, Non-member)Kinseki Ltd.),Yoshifumi Sekine, Member (Nihon University) This paper studies on high precision oscillator using GPS. In recent years, the high stabilization of the oscillator has been requested along with high speed of mobile communication devices. In this paper, first, we study on the relation between the number of measurement times and precision of the GPS reception signal. Because SA(Selective Availability) was canceled from May 2000, the precision of the received GPS signals is improving at present. Therefore, there is a possibility that we can decrease the integration number of measurement times. We show that integration with approximately lo-' times must be done. As a result we show that equal or superior stability is obtained at 1/10 the previous integration number of time. Also, the GPS reception signal has the high stability for the aging characteristic, We study on improvement of aging characteristic of crystal oscillator by using estimate function. As a result, we show that the frequency change reducing method by the aging characteristic revision is effective.