The CSAC GPSDO delivers highly stable and accurate timing with long‑term oscillator aging under 0.3 ppb per month in holdover and zero aging when GPS‑locked. Its temperature stability is better than ±0.5E‑09 from 0°C to 70°C without GPS disciplining. When GPS‑locked in position‑hold mode, it provides ±15 ns RMS 1 PPS accuracy and achieves frequency accuracy better than ±2E‑10 after three minutes. Holdover stability is under ±2 µs over 24 hours after warmup, and ADEV performance reaches 1E‑10 at 1 second and 2E‑12 at 10 ks. Outputs include a 5 V CMOS 1 PPS signal adjustable in 1 ns steps and four isolated 10 MHz sine waves at +13 dBm.

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