Citation
Abstract
This first part of a two-part analysis describes the unstable operation of the Symbol Synchronizer Assembly (SSA) in the narrow-narrow configuration at 84 bits/s. Reduction of a data set signal-to-noise (dB) vs. time indicates that the SSA is cycling between unstable lock conditions and entirely out-of-lock or ramp conditions. The ramp condition is so called because a strong second-order frequency term or linear drift becomes obvious. The drift magnitude is far beyond loop tracking capability and even marginal when a data rate of 334 bits/s is used. The data indicates a possible third-order term, noted casually in other unprocessed sets. Based on the ramp magnitude, it is finally recommended that bandwidths less than 0.01 Hz (design point) be avoided. Also, an outline is given of Part II, which extends the study to analyze the third-order possibility and will upgrade early results through sophisticated machine programming of statistical and iterative manipulations.
Details
- Volume
- 42-28
- Published
- August 15, 1975
- Pages
- 95–105
- File Size
- 899.8 KB