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Long-Term Aging Characteristics of OCXO and Calibration Optimization Scheme for Time Traceability Systems
2026-06-10
Despite excellent temperature stability of OCXO, long-term continuous vibration of quartz resonant wafers causes micro lattice deformation, leading to slow unidirectional drift of output frequency with operation time, namely crystal aging characteristic. Daily aging rate and annual aging rate are adopted to quantify drift amplitude, acting as key parameters to be controlled in long-duration time traceability systems.
Aging drift is slow-varying cumulative error without sharp short-term jump. New devices feature relatively fast initial aging rate, which gradually slows down and enters stable range after thousands of continuous operating hours. In traceability systems running over ten years such as national time standard machine rooms and satellite ground receiving stations, frequency offset accumulated over several years will exceed system synchronization threshold even after initial calibration, creating fixed deviation between local time standard and standard UTC time and gradually losing traceability validity.
The traditional solution relies on offline disassembly calibration with equipment shutdown, which consumes long operation time and interrupts continuous operation of the whole time standard system, failing to balance timeliness and continuity. The new optimized scheme adopts periodic remote online calibration architecture. The time standard system reserves access ports for standard reference clocks, automatically captures superior standard time-frequency signals quarterly and annually without shutdown or disassembly, corrects current frequency offset of OCXO in real time and updates local timing compensation parameters synchronously.
Besides, an aging rate fitting model is embedded into calibration algorithms to predict drift amount of the next cycle according to offset values obtained from previous two calibrations and pre-compensate frequency deviation in advance, extending interval between two online calibrations and reducing intervention frequency to system operation. This optimized scheme gives full play to temperature stability advantages of OCXO and makes up precision attenuation defects induced by long-term aging, significantly extending stable service cycle of high-precision time standard equipment without faults.
2026-06-10
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