ELECTROMAGNETIC INTERFERENCE OBJECTIVE COMPLEXITY EVALUATION METHOD BASED ON FAST S-TRANSFORMATION TIME-FREQUENCY SPACE MODEL

摘要

An electromagnetic interference objective complexity evaluation method based on a fast S-transformation time-frequency space model comprises the following steps: (1) carrying out fast S-transformation on space electromagnetic signals acquired in real time to obtain a fast speed S-transformation two-dimensional time-frequency matrix of the signal; (2) calculating time domain occupancy rate T_P, frequency occupancy rate F_P, and energy occupancy rate E_P of an evaluation object and interference signals in the fast speed S-transformation two-dimensional time-frequency matrix; (3) calculating electromagnetic interference objective complexity C=T_P*F_P*E_P according to the time-frequency space model; and (4) finding a grading standard according to an objective complexity value so as to determine an electromagnetic interference objective complexity type. Compared with the prior art, the electromagnetic interference objective complexity evaluation method based on the fast S-transformation time-frequency space model has the characteristics that a fast S-transformation method is adopted, one-dimensional limitation of Fourier transformation is overcome, three evaluation parameters including the time domain occupancy rate, the frequency occupancy rate and the energy occupancy rate can be rapidly extracted simultaneously, and by adopting the time-frequency space model, the problem of synchronous and overall evaluation of multiple evaluation parameters can be effectively solved.