Citation
Abstract
Recent DSN System Performance Test requirements (for pending missions) contain implied long-term measurements for which existing noncoherent test models are inadequate. The new models needed are those of the first two moments, mean and variance, of doppler noise under long-term conditions, and in noncoherent test mode. In this paper, the newer model for variance, the Allan technique, now adopted for testing, is analyzed in the subject mode. A model is generated (including considerable contribution from the station secondary frequency standard), and rationalized with existing data. A mean-frequency model is subsequently proposed, based on data available, but this model is not considered rigorous. It is an introductory idea, to be evaluated and incorporated if proved valid. It uses a fractional-calculus integral to obtain a quasistable result, as observed, with integrable spectrum poles. The variance model is definitely sound; the Allan technique mates theory and measure. The mean-frequency model is an estimate; this problem is yet to be rigorously resolved. The unaltered defining expressions are noncovergent, and the observed mean is quite erratic.
Details
- Volume
- 42-37
- Published
- February 15, 1977
- Pages
- 239–250
- File Size
- 812.7 KB