N.М. Ivanov¹

¹JSC "All-Russian Scientific Research Institute "Gradient" (Rostov-on-Don, Russia)

¹qkivanov@list.ru

Available methods for detecting and spatial localizing radio signals are mainly focused on stationary environment and are not well-suited for processing weak non-stationary signals.

The Capon’s method, which analysis allows to specify the direction-finding function, is taken as a basis in the paper under review. Based on the obtained expression for the true average power of a signal coming from an arbitrary direction, an algorithm is developed. Using the covariance matrices of the combined signal at different observation intervals, it creates the possibility of suppressing powerful stationary signals and thereby ensures the detection and direction finding of those weak signals that were absent during the previous time interval, but appeared on the air during the next one. Thus, there is an opportunity to track changes in the radio environment and process new signals.

The simulation results demonstrate the possibility of detecting and direction finding of non-stationary weak signals, which level is lower than the noise and interference level, against the background of stationary interfering high-power emission sources. The proposed method can significantly increase the efficiency of solving the problems of detecting and direction finding of weak non-stationary signals emitted by both stationary and mobile sources, in the standard and covert radio engineering systems.

Ivanov N.М. Detecting and direction finding of new weak signals in presence of high-power noise. Radioengineering. 2025. V. 89. № 11. P. 131−137. DOI: https://doi.org/10.18127/j00338486-202511-15 (in Russian)

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