MODELING THE SPECTRUM OF THE OUTPUT SIGNAL TO A RESPONSE SIGNAL GENERATOR FOR A RADIO TRANSMITTER IN AN INTER-SATELLITE COMMUNICATION LINK

V. S. Shalavin
Moscow Aviation Institute (NRU MAI), Moscow, Russia

A. Yu. Kudryashova
Moscow Technical University of Communications and Informatics, Moscow, Russia, a.i.kudriashova@mtuci.ru

DOI: 10.36724/2664-066X-2025-11-6-34-39

SYNCHROINFO JOURNAL. Volume 11, Number 6 (2025). P. 34-39

Abstract

In the modern world, the use of inter-satellite communication links presents engineering challenges: increasing demands on the precision of onboard antenna stabilization and pointing, radio link power potential, interference immunity, and information security, while the protocol organization of space networks becomes more complex. It is also noted that key tasks for such systems include ensuring electromagnetic compatibility, selecting multiple access methods, and rationally distributing functions between onboard systems and the ground control system. With the transition to large orbital constellations of small satellites in low-Earth orbits, typically using high and ultra-high frequency bands, analyzing the requirements for data transmission quality in inter-satellite communication links becomes a determining factor in selecting the architecture of the entire system. This article presents an experiment simulating the spectrum of the output signal fed to a response signal generator. This modeling is necessary to assess whether the generated radio signal meets output power requirements and the permissible level of out-of-band and spurious emissions. At the design stage of a radio transmitter, this allows one to take into account the influence of filter parameters and amplifier operating modes, identify excess spectral components outside the central frequency band, and adjust the device circuit.

Keywords:  Inter-satellite communication link (ISL), radio transmitting unit (RTD), spacecraft, information and telecommunications systems, generator

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