Determination of indicators of the effectiveness of complex signals of control channels of unmanned aircraft complexes

Abstract

The article discusses directions for improving the immunity of signals of control channels of unmanned aircraft complexes using complex signals. In order to implement the adaptation mode, it is proposed to use such devices for forming and processing signals of control channels that are rebuilt on command. This allows you to change: the parameters of a complex signal such as the base of a complex signal, the structure of the signal by pre-selecting it from the general ensemble, to perform a transition from one type of complex signal to another in accordance with the interference situation. These types of signal can be a discrete phase-manipulated signal, a discrete frequency-manipulated signal, i.e. with a pseudo-random frequency adjustment, or a combination thereof. It was determined that various types of complex signals have excellent capabilities in the fight against intentional jamming, which realize such properties as counteracting the suppression of the signal by jamming and concealment of its transmission to prevent parameter reconnaissance and eliminate the possibility of targeting jamming. To evaluate the effectiveness of complex signals, the selected indicator is the coefficient of suppression of interference by a complex signal based on the obtained analytical expressions for the values of the dispersion of the interference at the output of the correlation receiver after convolution of the complex signal. The second indicator of efficiency is the entropy hiddenness of a complex signal, which also varies for different types of signals. Such an indicator determines both energy and structural stealth, which significantly affects the time of exploration of the parameters of a complex signal. A conclusion was made about the expediency of using two parametric efficiency criteria, which comprehensively evaluates the main properties of a complex signal and allows to compare the types of signals for use in modems of the most effective control channels.