Space experiment for precision thermal stabilization of quantum frequency standards for navigation satellites

The basis of space navigation systems are highly stable atomic frequency standards, which form a highly accurate satellite time scale and a highly stable frequency grid, providing output accuracy characteristics of space systems as a whole. To basis of the precision thermostabilization system is the following basic principles: ensuring the spatial heterogeneity of heat fluxes based on atomic frequency standards using hyperheat-conducting plates; organization of high precision controlled thermal effects of heaters; improving the accuracy of temperature measurement (absolute and relative) using the onboard temperature standard. The results of laboratory, ground-based and space experiments showed that the principle of precision thermostabilization works in terms of taking into account the deviation of temperature from a given one and taking into account the influence of instability of the on-board power supply, and the accuracy of thermostabilization was also ensured taking into account the angle of rotation of solar cells from 0,025 °С up to 0,04 °C (in the shadow areas of the orbit). In addition, the using of hyper-conductive plates improved spatial instability of the thermoplate 6 times. As a result, the developed measures make it possible to increase the accuracy of precision thermostabilization to 0,01 °C.