Interference Immunity Improvement for Radiotechnical Systems of SC with EP
The application of modern methods for signal processing with the aim to increase interference immunity of raditechnical systems of SC with electric propulsion (EP) is considered. The principle of protection against SPT interference is discussed that is based on the adaptive extraction of characteristic components of the emission process within the temporal domain, their cutting out, and two-stage interpolation of the received signal complex envelope. We consider the algorithm of operation of the developed quadrature canceler of pulse interference that is a part of the channel of digital radio link “Earth-SC” with FBPSK. To analyze efficiency of the developed algorithm, we use the simulation modeling method with the representation of mathematical model for radio communication channel in the M-ATLAB/Simulink environment. Results are obtained both for the perfect phase and symbol locking, and for the case of operation of the phase and symbol locking systems (Gardner algorithm). It is shown that the power gain as a result of the proposed algorithm of quadrature canceler of pulse interference use under the exposure to the thermal noise and radio-frequency emission from the stationary plasma thruster can be as high as 3 dB with the signal-to-extracted component ratio (SECR) of 10 dB and 7 dB with SECR of 5 dB.