A modiΡed pseudo-noise（PN） code regeneration method is proposed to improve the clock tracking accuracy without impairing the code acquisition time performance.Thus,the method can meet the requirement of high accura...A modiΡed pseudo-noise（PN） code regeneration method is proposed to improve the clock tracking accuracy without impairing the code acquisition time performance.Thus,the method can meet the requirement of high accuracy ranging measurements in short time periods demanded by radio-science missions.The tracking error variance is derived by linear analysis.For some existing PN codes,which can be acquired rapidly,the tracking error variance performance of the proposed method is about 2.6 dB better than that of the JPL scheme（originally proposed by Jet Propulsion Laboratory）,and about 1.5 dB better than that of the traditional double loop scheme.展开更多
“嫦娥四号”中继星目前正稳定运行在地月L2点使命轨道,期间进行了再生伪码测距试验,试验期间交叉进行了再生伪码测距和侧音测距。利用“嫦娥四号”中继星在地月L2点使命轨道的再生伪码测距数据和侧音测距数据,进行了定轨精度评估。结...“嫦娥四号”中继星目前正稳定运行在地月L2点使命轨道,期间进行了再生伪码测距试验,试验期间交叉进行了再生伪码测距和侧音测距。利用“嫦娥四号”中继星在地月L2点使命轨道的再生伪码测距数据和侧音测距数据,进行了定轨精度评估。结果显示再生伪码测距数据的均方根误差(Root Mean Square Error,RMS)优于侧音测距数据RMS一个量级,同时再生伪码测距数据定轨和预报精度优于侧音测距数据一倍。这对再生伪码测距在中国后续深空探测任务中的应用具有参考意义。展开更多
基金supported by the National Natural Science Foundation of China (60904090)the Postdoctoral Science Foundation of China(20080431306)the Special Postdoctoral Science Foundation of China (20081458)
文摘A modiΡed pseudo-noise（PN） code regeneration method is proposed to improve the clock tracking accuracy without impairing the code acquisition time performance.Thus,the method can meet the requirement of high accuracy ranging measurements in short time periods demanded by radio-science missions.The tracking error variance is derived by linear analysis.For some existing PN codes,which can be acquired rapidly,the tracking error variance performance of the proposed method is about 2.6 dB better than that of the JPL scheme（originally proposed by Jet Propulsion Laboratory）,and about 1.5 dB better than that of the traditional double loop scheme.
文摘“嫦娥四号”中继星目前正稳定运行在地月L2点使命轨道,期间进行了再生伪码测距试验,试验期间交叉进行了再生伪码测距和侧音测距。利用“嫦娥四号”中继星在地月L2点使命轨道的再生伪码测距数据和侧音测距数据,进行了定轨精度评估。结果显示再生伪码测距数据的均方根误差(Root Mean Square Error,RMS)优于侧音测距数据RMS一个量级,同时再生伪码测距数据定轨和预报精度优于侧音测距数据一倍。这对再生伪码测距在中国后续深空探测任务中的应用具有参考意义。
