The increasing of dynamic accuracy of the auto adjustments of frequency system in radio-receivers

DOI №______

Abstract

A comparative assessment of the dynamic characteristics of the static auto adjustments of frequency (AAF) system with the principle of deviation control, the combined auto adjustments of frequency (AAF) system with first order astatism, and the auto adjustments of frequency (AAF) system with first order astatism with the principle of deviation control is given.
It is shown that in the static AAF system with the principle of control by deviation there is a contradiction between the conditions for increasing the dynamic accuracy and stability, which is an obstacle to improving the quality indicators of the system. An increase in dynamic accuracy can be achieved by converting a static system into an astatic with an first-order astatism as a result of the inclusion of an integrating element in a closed loop. A mathematical model is developed for a combined system of PRTs with first-order astatism. In order to reduce dynamic errors and increase performance, a combined AAF system with second-order astatism is proposed.
From the comparison of the dynamic characteristics of the AAF systems, it follows that the AAF system with the principle of deviation control with first order astatism (with an integrating element) has the advantage and it is expedient to apply it in cases when high accuracy is required in steady-state conditions when the disturbing influence changes according to deterministic laws and there are no strict requirements for speed and standard errors for random disturbing influences. A further increase in dynamic accuracy is achieved by introducing to a first order astatism AAF system with the principle of deviation control the open connection by a disturbing influence, synthesized in accordance with the conditions for increasing astatism from first to second, that is the construction of the AAF system with the principle of combined control.

Keywords: dynamic accuracy, astatic system, system auto adjustments of frequency (AAF), integrating element, comparing estimate.

References (MLA)
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