Abstract <p>The paper explores the capabilities of modern methods of spectral-temporal analysis in studying high-frequency emission from stationary plasma thrusters. The experimental model of SPT-70 developed at the Research Institute of Applied Mechanics and Electrodynamics, Moscow Aviation Institute (RIAME MAI) was chosen as the object of study. The task posed in the study was to test the hypothesis that the considered time sample functions of the emission process can represent a superposition of independent processes intersecting in time and having similar frequency characteristics. Spectral analysis methods such as continuous wavelet transform, Wigner-Ville transform, and empirical mode decomposition were used. The results of the study showed that the integrated use of spectral-temporal analysis methods allows for the further identification of the fine structure of pulsed emission and the acquisition of new knowledge about the nature of the self emission from of plasma thrusters. The obtained data can be used to refine models of electromagnetic emission from stationary plasma thrusters, as well as in the development of signal processing algorithms aimed at increasing the noise immunity of on-board radio systems and ensuring electromagnetic compatibility of spacecraft.</p>