Computer model of a signal filtering device for a monitoring earth station

Abstract

Satellite communication systems have an advantage over other communication systems, as they have a large coverage of the territory. The Earth station can be located anywhere in this territory and can be either a legitimate user or a satellite pirate (an illegitimate user). The developers are faced with the task of determining the coordinates of an illegitimate user illegally occupying a frequency resource. The article proposes a block diagram of a signal filtering device, which is part of a device for determining the coordinates of an illegitimate user, a monitoring Earth station. The purpose, requirements and main task of each composite block of the filtration device are defined. The search and analysis of analog filters and signal filtering methods was carried out. In the MatLab Simulink software environment, a computer model of a signal filtering device has been developed according to a block diagram with the possibility of determining the phase run, as well as the settings of the filtering device blocks are disclosed, which can be adjusted during the study of the model. For the bandpass filters included in the filtering device, the phase frequency characteristics of the phase change of the received signal on the frequency of this signal are constructed. A phase lock loop system has been formed with the possibility of changing its parameters. Calculations of the phase incursion through the elements of the filtration device are made.

Keywords

• coordinate determination device
• filtering device
• phase lock loop
• computer simulation
• earth station
• phase shift