Citation
Abstract
Part I (Ref. 1) developed a simple frequency ramp model to initiate understanding of the Symbol Synchronizer Assembly (SSA) instability at low bit rates in narrow bandwidths. Part II, presented here, describes extensive data processing to develop a third-order phase model and then to translate all such processed data to the frequency realm for further analysis. The frequency study yields a long frequency modulation (FM) drift sinusoid (1600-s period), an impressed secondary drift wave with a period of about 116 s, and a set of even harmonics of twice the ramp period—the latter arising from, and used to modify, the phase detector model. The result is applied secondarily to estimate the strong-signal SSA phase detector respopse “out-of-lock.” Finally, the main drift components are verified against all available data, and the result is used to estimate minimum lock conditions and the SSA drift effect under normal operating modes. The instability problem appears marginally resolvable if the acquisition technique is modified.
Details
- Volume
- 42-30
- Published
- December 15, 1975
- Pages
- 222–230
- File Size
- 716.4 KB