Analysis of Spectrum Characteristics of GPS Time Comparison Under Two Conditions

摘要

In order to understand GPS time comparison characteristics associated withinfluences from SA (Selective Availability) effects, a number of experiments were carried out in early 1992. The results of frequency spectrum analysis clearly show that: (1) Under normal conditions, GPS time comparison spectrum characteristics are basically level. There are no clear periodic phenomena. Noise processes are phase modulated white noise. (2) When GPS time comparisons are influenced by SA effects, low frequency spectra are relatively clearer. There are obvious periodic phenomena. Among these, 5-15 minute period signals account for approximately 77%.