Study Of Spacetime Clock And Extended Applications Of Its High Stability Time References

The high precision and high stability time reference plays an important role in modern communication,navigation and positioning,aerospace,national defense construction and national economy.It involves every aspect of daily life and has a strong traction effect on the development of science and technology.The time reference established based on atomic clocks and optical clocks is a hot spot in the competition among powerful countries.It reflects the level of science and technology application and is of great significance to the development of national economy,scientific and technological progress and national security.Atomic clock,optical clock and so on are a kind of frequency stable timing devices and extremely precise and complex instruments,which are subject to many constraints in practical application.In mobile and portable applications such as navigation and communication,lightweight,miniaturized and even miniaturized timing devices become necessary conditions,and at the same time,they should have enough stability and accuracy.CPT atomic clock is the research result of miniaturization of the time reference,but its comprehensive performance has no absolute advantages compared with crystal oscillator timing,and crystal oscillator timing is still the main application in communication,navigation,microelectronics and aerospace electronic system.This thesis focuses on the payload of ASRTU satellite-spacetime clock and studied the on-orbit high accuracy high stability time application.Under the constraints of volume,weight,power consumption and cost,the time reference,high stability clock,frequency stability mechanism and application of high stability clock are studied on the premise of realizing the objective of in-orbit scientific experiment.Based on the principle of invariable speed of light and the concept of meter bar,a timing device named space time clock is proposed.In this paper,the time reference model which transforms space interval into time interval is studied,the influencing factors of time reference stability are analyzed theoretically,and the mathematical model of space time clock is established.The working principle,functional performance and frequency stability of space time clock are analyzed,which lays a theoretical foundation for the development of high stability clock.The IC electronic system simulation and verification model of the space time clock is established.the logic circuit and layout of the space time clock are designed,and the design parameters of the space time clock are optimized.According to the simulation verification,the IC chip of the space time clock and the payload of the ASRTU satellite(space time clock)are developed.The function and performance of the space time clock are tested.Aiming at the on-orbit test of clocks with high stability,an on-orbit evaluation scheme of frequency stability of dual-clock phase pair was designed.The clock frequency counting and relative accumulated error counting method were used to solve the on-orbit evaluation problem of frequency stability of space time clock.Based on the characteristic that the time datum of space time clock is derived from space interval transformation and the space configuration of time datum is diagonal rate sensitive,a method of angular rate sensitive based on complementary frequency electromagnetic gyroscope is proposed.The Sagnac effect sensitive ring configuration of complementary frequency gyroscope was studied,and the mathematical models of angular rate,relative time difference and relative frequency difference were established by using the double-ring sensitive structure.The relationship between the random walk coefficient and system parameters was given,and the performance of complementary frequency gyroscope was simulated and verified.In this thesis,the application of high stability space time clock for gravitational wave detection is studied.The space interval provided by the space time clock as the meter bar is naturally sensitive to spatial deformation,and a gravitational wave detection method based on the principle of space time clock is proposed.The function and performance of gravitational wave detection are analyzed by simulation,which provides a new method for gravitational wave detection.