The paper considers the method of experimental evaluation of the signal / noise ratio in relation to space communication systems. The basis of the high-precision evaluation method laid experimental signal / noise ratio is implemented by measuring the average number of the envelope of the additive mixture signal emissions and narrowband normal random process.
Keywords: Space communication system, command-and-measurement system, signal / noise ratio, the number of emissions, the envelope of the additive mixture, rms noise level restrictions, the sub-carrier frequency