A METHOD FOR PROTECTING SPACE COMMUNICATION AND CONTROL SYSTEMS BASED ON DYNAMIC CHANGE OF COMPLEX SIGNAL SHAPES

The experience of operating space systems shows that the effectiveness of such systems significantly depends on the quality of the spacecraft communication and control system. Given that space communication and control systems are accessible to in- truders, such systems protect transmitted commands and messages using cryptographic information transformations and special equipment. The algorithms implemented in such systems provide passive protection of the spacecraft control system, where the control equipment refuses to process commands in the presence of powerful interference. Implementation of effective measures is becoming a key component of strategies to protect space communication and control systems, as technological capabilities for attacks on a spacecraft via a radio channel are constantly evolving and becoming more complex. Protection against powerful intentional interference in such systems is carried out using signals with frequency redundancy. The article discusses the method of dynamic change of signal shapes, which enhances the security of information at the physical level. The analysis of interference protection and imitation resistance of space communication and control systems using various systems of complex signals is carried out. The ensemble characteristics of complex signal systems are analyzed. The results of studies of imitation resistance when using different signal systemsare presented. It is determined that the implementation of the dynamic mode of operation achieves a gain in comparison with traditional algorithms for protecting space communication and control systems. The con- ditions for the practical implementation of the dynamic mode of operation of space communication and control systems are formulated. Signal systems are proposed that can provide the solution to the problem of security of information transmission in space communication and control systems at the physical level.