he initiatives to create constellations of low-orbiting satellites have paved the way for the development of communication systems for them. Given that these systems have to be robust, in order to provide unlimited connectivity across the planet, helping to connect the unconnected.

Thus, the article describes an implementation of a reconfigurable system for low-orbit satellites based on Simulink. Reconfigurability is possible through Software Defined Radio technology, which allows some or all of the physical layer functions to be implemented via software. This is a great advantage for satellites, since in space it is not feasible to change the hardware. Thus, it is possible to modify the communication parameters through a radio base station, that is, remotely.

Therefore, through the simulation in the Simulink software, reconfigurability becomes capable insofar as it makes it possible to change the parameters of the blocks and the blocks themselves. In it, the system presents the receiving chair that receives information from the subsystem called Command, that is, command data from the ERB related to the proper functioning of the satellite systems. These data, modulated in BFSK (Binary Frequency-shift Keying) and in FM (Frequency Modulation), are demodulated. Then, in the transmitting chair, called Telemetry, it is modulated in BPSK (Binary Phase-shift Keying) to be sent back to the ERB with information related to the health and status of the satellite.