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A Precision-Control Method with Micro-Step for OCXO Clocks in LEO Satellites
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Dongdong WANG1, 2, Wenhe LIAO1, Bin LIU2, Qianghua YU2
Journal of Telemetry, Tracking and Command | 2025, 46(6) : 95 - 101
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Journal of Telemetry, Tracking and Command | 2025, 46(6): 95-101
• TT & C Communication and Navigation •
A Precision-Control Method with Micro-Step for OCXO Clocks in LEO Satellites
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Dongdong WANG1, 2, Wenhe LIAO1, Bin LIU2, Qianghua YU2
Affiliations
  • 1. Dept. Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210000, China
  • 2. Beijing Research Institute of Telemetry, Beijing 100076, China
doi: 10.12347/j.ycyk.20250707001
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To address the multiple requirements of low cost, low power consumption, and high accuracy (sub-nanosecond level)for time-frequency systems in large-scale low Earth orbit (LEO) navigation constellations, a precision frequency control method based on micro-step adjustment is proposed for oven-controlled crystal oscillators (OCXOs), targeting the mitigation of long-term frequency drift. A quantization noise model was established, and a 48-bit direct digital synthesizer (DDS) was employed to achieve high-resolution real-time frequency correction at 5×10-13 resolution. A constraint framework and frequency adjustment procedure compatible with rapid precise position services were constructed. Experimental results demonstrate that during 24-hour continuous operation, a clock bias accuracy (RMS) of 0.24 ns was achieved. Compared to free-running state, a long-term frequency stability was significantly improved by three orders of magnitude, with a slight degradation of 25% in short-term stability (1 s-20 s). This approach provides a cost-effective, high-precision, and stable time-frequency reference solution for LEO constellation construction.

Low Earth Orbit (LEO) satellites  /  Oven-controlled crystal oscillator (OCXO)  /  Quantization noise  /  Micro-step  /  Frequency stability
Dongdong WANG, Wenhe LIAO, Bin LIU, Qianghua YU. A Precision-Control Method with Micro-Step for OCXO Clocks in LEO Satellites[J]. Journal of Telemetry, Tracking and Command, 2025 , 46 (6) : 95 -101 . DOI: 10.12347/j.ycyk.20250707001
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Year 2025 volume 46 Issue 6
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doi: 10.12347/j.ycyk.20250707001
  • Receive Date：2025-07-07
  • Online Date：2026-03-13
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  • Received：2025-07-07
  • Revised：2025-07-23
Affiliations
    1. Dept. Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210000, China
    2. Beijing Research Institute of Telemetry, Beijing 100076, China
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多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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