Passive hydrogen maser(PHM)has the advantages of high frequency stability and low frequency drift.It has been widely used in the navigation system and frequency calibration.Atomic transition signal am
International time transfer experiment based on GPS-and BDS-precise point positioning(PPP)technique is carried out using final(ISC)and rapid(ISR)precise satellite clock products provided by iGMAS(inte
Each observation station in the VLBI has an independent hydrogen clock.In particular,on rare occasions the phase lock synthesizer loss phase lock on the signal from the hydrogen maser cavity resulting
As an important load of BDS,the performance of satellite-borne atomic clock directly affects the service level of navigation system.Based on the requirements of navigation system on atomic clocks in o
Analysing the mechanism of nonlinear variations in GPS stations coordinates time series is an effective way to improve the coordinates accuracy of GPS stations.The constellation design characteristic
A novel approximate analytical method is presented for calculating parameters of Whispering Gallery Mode(WGM)in a sapphire dielectric resonator(SDR).It is based on ray optics and wave theory.The frequ
With the huge potential of the GNSS market and thousands of LEO satellites in space in the future,a novel way is to use these LEO mega-constellations for positioning.In order to fulfil this purpose,th