Research Progress of High Precision Free Space Time-frequency Transfer Technology
In recent years,with the promotion of GNSS navigation,satellite internet,5G mobile communication and other applications,free space time-frequency transfer technology has developed rapidly.Its technical means cover microwave and laser,its application scenarios cover ground to deep space,and it's widely used in astronomy,metrology,geophysics and other fields.In order to study free space time-frequency transfer technology further,a review of free space time-frequency transfer is carried out.Firstly,the basic principles of free space time transfer and frequency transfer are described in detail,and the research status of free space time transfer,frequency transfer and time-frequency transfer technology are emphatically analyzed.Secondly,the development trends and challenges of various free space time-frequency transfer technology systems are summarized,and relevant suggestions are given.Meanwhile,the latest technical indexes,main characteristics and engineering applications of free space time-frequency transfer are compared.Finally,the future applications of high-precision free space time-frequency transfer are expected to provide technical support for next generation navigation,low orbit constellation network,space science and other scenarios.
Free spaceTime transferFrequency transferTWSTFTLaser pulseCoherent light phaseOptical radio frequencyOptical frequency comb
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