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SSA+FBPF方法及其在北斗卫星钟差周期项提取中的应用
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Journal Article
SSA+FBPF方法及其在北斗卫星钟差周期项提取中的应用
2016
Overview
针对奇异谱分析(singular spectrum analysis,SSA)方法在重建准周期项时容易存在频率混叠的现象,傅里叶带通滤波器(fourier band pass filtering,FBPF)提取准周期项时,边界值极易受到残留的趋势项的影响而导致其不够精确,本文提出了一种SSA与FBPF相结合的方法(SSA+FBPF),即先利用SSA方法对信号进行分层选组重建,再对重建信号进行傅里叶带通滤波。仿真试验结果表明在信噪比(SNR)为0.017的情况下,SSA+FBPF方法重建周期信号精度比SSA方法提高了35%,比FBPF方法提高了26%,这说明该方法不仅抑制趋势项对边界值的影响,而且具有良好抗噪声干扰的能力。将SSA+FBPF方法用于重建北斗卫星PC06和PC07的24h周期项,发现北斗卫星钟PC06和PC07周期项幅值均存在明显变化。
Publisher
中国科学院上海天文台,上海 200030%中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,湖北 武汉,430077%三峡大学土木与建筑学院,湖北 宜昌,443002,北京卫星导航中心,北京 100094
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