Citation
Abstract
The performance of a carrier phase-locked loop (PLL) driven by a periodic Doppler input is investigated. By expanding the Doppler input into a Fourier series and applying the linearized PLL approximations, it is easy to show that, for periodic frequency disturbances, the resulting steady-state phase error is also periodic. Compared to the method of expanding frequency excursion into a power series, the Fourier expansion method can be used to predict the maximum phaseerror excursion for a periodic Doppler input. For systems with a large Doppler-rate fluctuation, such as an optical transponder aboard an Earth-orbiting spacecraft, the method can be applied to test whether a lower order tracking loop can provide satisfactory tracking and thereby save the effort of a higher order loop design.
Details
- Volume
- 42-104
- Published
- February 15, 1991
- Pages
- 68–73
- File Size
- 297.7 KB