Method for reducing phase fluctuations of a precision frequency response meter for microwave quantum generators

The principle of operation of the device for measuring frequency characteristics is considered. Block diagram of a device for measuring the frequency characteristics of a digital frequency comparator with correlation quadrature processing and description of their components is illustrated. The block diagram of the frequency multiplier is given. The accuracy characteristics of the developed meter design are evaluated. They are compared with the characteristics of previously used devices. The Improve accuracy characteristics and increased stability of operation were found.

Modernization of time scale control unit for «Glonass-K» spacecrafts

Navigation spacecraft’s atomic clocks suffer from sudden small frequency jumps. These jumps lead to a decrease of user’s positioning accuracy and should be considered. Traditional method to detect these frequency jumps with the use of ground control segment does not ensure early user alert of increasing range error. A perspective way to improve global navigation satellite system’s signal integrity is the use of satellite on-board autonomous system for continuous control of board synchronization equipment time scale. This paper describes a novel diagram of frequency comparator – the main element of such system. The main difference of proposed solution is an application of time-to-digital converter for estimation of time error which allows to decrease mass, dimensions and power consumption. The paper deals with the particularities of direct frequency comparator implementation for on-board equipment of space vehicle and describes structure of implemented breadboard model.