Improving the Reliability of Data Transmission on the “Spacecraft-Ground” Communication Line. Complexing Mode for Intermittent Radiation with Diversity Receive

The method of increasing the reliability of data transmission under conditions of lognormal amplitude fluctuations of millimeter radio waves at the “spacecraft - ground tracking station” communication line is considered. The complexing mode of intermittent radiation with diversity coherent signals reception when combining the diversity branches according to the select diversity reception algorithm is realized. Accordingly, the estimation of optimal threshold level of the transmitting device is made. Also it is shown that for optimal threshold level, not only the minimum probability of erroneous data reception is provided, but the transmitter energy consumption is also reduced. At the same time, the nose immunity of complexing mode gain grows with an increase of dispersion of lognormal amplitude fluctuations. In this mode the transmitter power does not change. This condition provides a minimum probability of error data reception at the optimal threshold level. Besides, the fixed transmitter power maintains high reliability of all transmitting equipment, as it excludes additional tuning of the power amplifier. In this mode the transmitter power does not change. This condition provides a minimum probability of error data reception at the optimal threshold level. Besides, the fixed transmitter power maintains high reliability of all transmitting equipment, as it excludes additional tuning of the power amplifier.