摘要
根据多尺度数据融合理论设计了一种多模式组合定时设备,通过对GPS/GLONAS/"北斗"授时信号进行数据融合,综合得到更高精度的时间频率信号。GPS/GLONAS/"北斗"授时信号分别在不同小波尺度上进行小波分解,通过在不同小波尺度上进行小波加权,通过逆小波变换重构时间尺度,该时间尺度在理论上与UTC保持一致。测试结果表明:经过对本地晶体振荡器进行驯服后,该设备输出的频率稳定度达10-12,比单个模式的授时设备驯服前提高一个量级。
A multi-mode combined timing device was designed based on multi-scale data fusion theory, which can output the time frequency signal with higher precision by combining the GPS, GLONAS and Beidou timing signals. Firstly, the GPS, GLONAS and Beidou timing signals are decomposed respectively in different wavelet scales. Second- ly, the wavelet coefficients of these signals in the same scale are synthesized with wavelet weighting method scale by scale. Thirdly, inverse wavelet transform is used to reconstruct the signal that represents the timescale. The new times- cale is in step with UTC theoretically. Test result shows that after disciplining the local oscillators, the frequency sta- bility of the device reaches to 10-12, which is higher than that of the single-mode device by one order of magnitude.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2013年第6期1209-1217,共9页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(61004122)
陕西省教育厅项目(2010JK724)
西安市创新支撑计划(CX1258)
江苏省"博士集聚"计划资助项目
关键词
组合定时
多尺度数据融合
定时设备
combined timing
multi-scale data fusion
timing device
