Повышение эффективности телеметрических радиолиний кластера малоразмерных космических аппаратов

Abstract

The article is devoted to the study of the energy and frequency efficiency of frequency modulated signals with a continuous phase. The values of efficiency indicators obtained from the results of the study made it possible to supplement the existing diagrams of the efficiency of telemetric radio lines with new values. The results of the work simplify the task of selecting signals to ensure information exchange via telemetric radio lines of the cluster under the conditions of restrictions imposed on energy resources. The analysis of efficiency indicators of angular modulation methods used in modern telemetry systems is carried out. The features of the cluster construction of the orbital constellation of small spacecraft are taken into account. The use of frequency modulated signals with a continuous phase is proposed, which makes it possible to increase the energy efficiency of telemetry radio lines due to intersymbol phase connections inherent in this class of signals. Based on the results of the simulation, the values of performance indicators for the proposed signals are determined. Intersymbol phase connections were taken into account using the Viterbi algorithm. The values of the modulation indices of frequency modulated signals with continuous phase, which are of practical interest, are determined. The use of the proposed signals makes it possible to obtain an energy gain of up to 3 dB in comparison with the signals used at present. The values of the modulation indices, the use of which is impractical, are highlighted.