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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.
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针对大规模低轨导航星座部署中时频系统面临低成本、低功耗与高精度(亚纳秒级)的多重需求,本文提出一种基于微步进的恒温晶振(OCXO)时钟频率精细控制方法,解决晶振长期频率漂移问题。通过建立调频量化噪声模型,结合48位直接数字频率综合器(DDS)实现5×10-13分辨率的高精度频率实时校正,构建满足快速精密定位服务的约束框架和调频流程方法。结果表明:该方法在24小时连续测试中,系统钟差精度(RMS)提升至0.24 ns,长期频率稳定度(10 000 s)达3.16×10-14(较自由状态优化3个量级),短期稳定度(1 s~20 s)损失仅25%,为低轨星座建设提供了低成本、高精度、高稳定性时频基准解决方案。
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刘斌 1979年生,博士,研究员。
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System architecture of the precision control with micro-step, figureFileSmall=OF38ntuRGHw9erbTb5oXRA==, figureFileBig=UTyY0Q+tv8oFCQ5/AL3Qog==, tableContent=null), ArticleFig(id=1239158387980685988, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=图1, caption=
微小步进调频系统架构, figureFileSmall=OF38ntuRGHw9erbTb5oXRA==, figureFileBig=UTyY0Q+tv8oFCQ5/AL3Qog==, tableContent=null), ArticleFig(id=1239158388152652463, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=EN, label=Fig. 2, caption=
System flowchart of real-time precision control with micro-step, figureFileSmall=RKFYoJtB3zQKTVL/Jdn7qg==, figureFileBig=Pv49gn/BqGWXgQXf2EvOLw==, tableContent=null), ArticleFig(id=1239158388236538545, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=图2, caption=
实时精细调频流程, figureFileSmall=RKFYoJtB3zQKTVL/Jdn7qg==, figureFileBig=Pv49gn/BqGWXgQXf2EvOLw==, tableContent=null), ArticleFig(id=1239158388303647409, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=EN, label=Fig. 3, caption=
Clock bias for free-running, figureFileSmall=xW3SUVihERQBHTtElsI7xw==, figureFileBig=ncDiH05yoNcZyY6Ep+msGw==, tableContent=null), ArticleFig(id=1239158388391727797, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=图3, caption=
自由运行下钟差测试结果, figureFileSmall=xW3SUVihERQBHTtElsI7xw==, figureFileBig=ncDiH05yoNcZyY6Ep+msGw==, tableContent=null), ArticleFig(id=1239158388484002489, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=EN, label=Fig. 4, caption=
Clock bias under micro-step control, figureFileSmall=Sw1F2ArMtAhSuFWcFCIdKg==, figureFileBig=cI95T0HVFCGyDhIga6yDCg==, tableContent=null), ArticleFig(id=1239158389952008894, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=图4, caption=
微步进精控制下的钟差测试结果, figureFileSmall=Sw1F2ArMtAhSuFWcFCIdKg==, figureFileBig=cI95T0HVFCGyDhIga6yDCg==, tableContent=null), ArticleFig(id=1239158390035894978, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=EN, label=Fig. 5, caption=
Frequency bias for free-running, figureFileSmall=KPpV9IZYSCPRnVY+Z78DJg==, figureFileBig=eofdO4ei9UArNEJ7j86cvg==, tableContent=null), ArticleFig(id=1239158390140752585, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=图5, caption=
自由运行下频率偏差测试结果, figureFileSmall=KPpV9IZYSCPRnVY+Z78DJg==, figureFileBig=eofdO4ei9UArNEJ7j86cvg==, tableContent=null), ArticleFig(id=1239158390270776014, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=EN, label=Fig. 6, caption=
Frequency bias under micro-step control, figureFileSmall=In8bcF3TzvigKwKoGVJM1w==, figureFileBig=WzlOP9BHeNBxndTey9ABVA==, tableContent=null), ArticleFig(id=1239158390358856400, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=图6, caption=
微步进控制下的频率偏差测试结果, figureFileSmall=In8bcF3TzvigKwKoGVJM1w==, figureFileBig=WzlOP9BHeNBxndTey9ABVA==, tableContent=null), ArticleFig(id=1239158390438548179, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=EN, label=Fig. 7, caption=
Frequency stability comparison, figureFileSmall=tkpjb8QOktp+tMUzaXwM8Q==, figureFileBig=1MMZKp42wg3uLWJmc2hP/Q==, tableContent=null), ArticleFig(id=1239158390522434263, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=图7, caption=
频率稳定度对比测试结果, figureFileSmall=tkpjb8QOktp+tMUzaXwM8Q==, figureFileBig=1MMZKp42wg3uLWJmc2hP/Q==, tableContent=null), ArticleFig(id=1239158390618903259, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=EN, label=Table 1, caption=
A comparison table of frequency stability represented by Allan deviation
, figureFileSmall=null, figureFileBig=null, tableContent=
| Averaging Time (s) | σy(τ) (micro-step control) | σy(τ) (free-running) | Improvement Ratio |
|---|
| 1 | 1.38×10-12 | 1.18×10-12 | 0.86 |
| 2 | 1.67×10-12 | 1.35×10-12 | 0.81 |
| 4 | 2.21×10-12 | 1.72×10-12 | 0.78 |
| 10 | 3.65×10-12 | 2.73×10-12 | 0.75 |
| 20 | 4.43×10-12 | 3.81×10-12 | 0.86 |
| 40 | 2.95×10-12 | 5.42×10-12 | 1.84 |
| 100 | 1.76×10-12 | 8.45×10-12 | 4.80 |
| 1 000 | 2.46×10–13 | 3.22×10-11 | 130.90 |
| 2 000 | 1.46×10-13 | 4.38×10-11 | 300.00 |
| 4 000 | 7.25×10-14 | 5.34×10-11 | 736.60 |
| 10 000 | 3.16×10-14 | 7.88×10-11 | 2 493.70 |
), ArticleFig(id=1239158390736343778, tenantId=1146029695717560320, journalId=1238841944844054536, articleId=1239158374311448701, language=CN, label=表1, caption=
频率稳定度指标对比分析
, figureFileSmall=null, figureFileBig=null, tableContent=
| Averaging Time (s) | σy(τ) (micro-step control) | σy(τ) (free-running) | Improvement Ratio |
|---|
| 1 | 1.38×10-12 | 1.18×10-12 | 0.86 |
| 2 | 1.67×10-12 | 1.35×10-12 | 0.81 |
| 4 | 2.21×10-12 | 1.72×10-12 | 0.78 |
| 10 | 3.65×10-12 | 2.73×10-12 | 0.75 |
| 20 | 4.43×10-12 | 3.81×10-12 | 0.86 |
| 40 | 2.95×10-12 | 5.42×10-12 | 1.84 |
| 100 | 1.76×10-12 | 8.45×10-12 | 4.80 |
| 1 000 | 2.46×10–13 | 3.22×10-11 | 130.90 |
| 2 000 | 1.46×10-13 | 4.38×10-11 | 300.00 |
| 4 000 | 7.25×10-14 | 5.34×10-11 | 736.60 |
| 10 000 | 3.16×10-14 | 7.88×10-11 | 2 493.70 |
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