On a possibility of reducing the requirements put on generator stability in radiointerferometers with noncoherent reply.

It is noted that radio interferometry with an interrogation station aboard a spacecraft and a response station on earth may be used to investigate processes originating in the interplanetary plasma but encounters serious difficulty due to breakdown of coherency between the interrogation and response signals. The present paper shows that the introduction of two interrogation channels with different frequencies will, in principle, eliminate frequency drift between independent oscillators and will sharply reduce the requirements for oscillator stability. An analysis is performed which demonstrates the accuracy of the proposed technique and the reduced stability requirements when investigating interplanetary tangential discontinuities, detached plasma formations in the magnetosphere, and other such phenomena.