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研究了振荡器抖动对跟踪系统性能的影响。首先,寻求抖动的适当的表征。已经找到频率(或相位)起伏的功率谱是振荡器抖动的一种有意义且有效的表征方法。其次,在距离和距离变化率的测量中,由振荡器引入的均方误差是与这个功率谱有关。得到的简单关系,使我们可以辨别抖动频谱中那些分别代表“短期”不稳定度和“长期”不稳定度的部分。可在频率为2/1处粗略地画出分界线,这里τ是往返传播时间。因此,长期和短期不稳定度仅在给定应用的意义上才是可辨别的。哥达德距离和距离变化率系统包括了许多可能的抖动源。估算了多种抖动源对整个距离变化率误差的贡献。因为有关抖动谱的资料十分缺乏,所以要得到误差的精确的数值结果是不可能的。得出的结沦是:对于未来系统的振荡嚣技术要求应在抖动谱的基础上产生,并且为了估算振荡嚣的稳定度应该研究精确的测量技
The effect of oscillator jitter on tracking system performance is investigated. First, look for the proper characterization of jitter. Having found the frequency (or phase) fluctuation power spectrum is a meaningful and effective characterization of oscillator jitter. Second, in the measurement of the rate of change of distance and distance, the mean square error introduced by the oscillator is related to this power spectrum. The simple relationships we get allow us to discern those parts of the jitter spectrum that represent the “short-term” instability and the “long-term” instability, respectively. The boundary can be roughly drawn at a frequency of 2/1, where τ is the round-trip propagation time. Therefore, long-term and short-term instability is discernible only in the sense of a given application. The Goddard distance and distance rate of change system includes many possible sources of jitter. The contribution of various jitter sources to the error of the rate of change of the overall distance is estimated. Because of the lack of information on jitter spectra, it is not possible to get accurate numerical results of errors. The resulting conclusion is that the technical requirements for future system oscillations should be generated on the basis of the jitter spectrum, and in order to estimate the stability of the oscillation, precise measurement techniques