Determination of speed parameters of space vehicles by measurements in retiring systems

The determination of the speed parameters of a spacecraft (SC) - a subscriber of a space relay system based on Doppler measurements performed in interrogation mode is considered under the assumption that the carrier frequency of the response signal from the SC is coherent to the frequency of the request signal received by the SC, and the carrier frequencies of radio links are formed on the repeater satellite by heterodyning the received signals and the signal of its own master oscillator