Космические аппараты и технологии (Dec 2022)
Measures for attenuation of interference at the level of design of the measuring system of spacecraft
Abstract
One of the primary tasks in the development of temperature control interface modules used as part of onboard equipment for measuring systems on spacecraft for various purposes is to justify a set of measures to ensure their noise immunity, taken at the levels design of the measuring system, measuring device and temperature control interface module. Such a justification involves an assessment of the effectiveness of possible methods for attenuating various types of interference affecting the measuring system, which determine the electromagnetic environment on the spacecraft. The article is devoted to the consideration of interference mitigation measures at the design level of the measuring system, which should be taken to ensure the required noise immunity of the temperature control interface module in combination with measures taken at other design levels. It is shown that in order to ensure the required noise immunity of the temperature control interface modules, it is necessary at the level of the measuring system design to provide for measures to mitigate interference in the power cable and in the measuring cables. In the power cable, it is possible to attenuate interference by reducing the impedance of the common electrostatic shield and the resistance of the connection of the wires of the on-board power buses, as well as by twisting the wires in the form of a twisted pair. In measuring cables, it is possible to attenuate interference by reducing the impedance of the common electrostatic shield and the resistance of communication wires of communication lines, introducing an additional electrostatic shield for individual groups of wires of communication lines, and using pair or quadruple twist in individual groups of wires.
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