Key Parameter Analyse Of Carrier Phase Timing In ZFS System And Software Implement

In the fast-developing information age,the requirements for timing accuracy are increasing in various industries.In some cutting-edge technologies,such as rocket launching,attack and defense of space targets,etc.,nanosecond requirements are imposed on time.The forward-based satellite navigation test system(referred to as "forward-based system")can realize real-time nanosecond-level timing accuracy based on carrier phase and single-frequency single-star conditions,meeting the needs of high-precision time applications.The transponder system realizes positioning and timing based on the mode in which the communication satellite transparently forwards the ground station to generate the navigation signal,and the key to realize the carrier phase high-precision timing is to solve the problem that the satellite time is not synchronized and the signal carrier performance is deteriorated.Aiming at these problems,the paper analyzes and studies the system time-frequency characteristics,satellite time synchronization and code-load consistency control residual compensation algorithm,and designs and implements the analysis software.The main research contents are as follows:(1)Studying the time-frequency characteristics of the transponder system,analyzing the stability of the ground-time frequency reference of the transponder system and the local oscillator of the communication satellite,and analyzing the carrier frequency at the phase center exit of the transmitting antenna of the satellite transponder(referred to as the "transponder exit").The influencing factors of accuracy,using the measured data to analyze the frequency accuracy of the transponder exit in the case of satellite forwarding,and comparing with the transponder exit frequency after the carrier frequency pre-bias,verify the system code load consistency control performance;(2)For the time synchronization of the forwarding system,the uplink delay of the signal from the ground to the exit of the transponder is analyzed.The time synchronization method of the satellite is given.The time synchronization deviation model and model parameters of the satellite are given.The magnitude of the data is analyzed and the data quality reported by the satellite time synchronization deviation model is analyzed.The results show that based on the model,the satellite time synchronization better than 0.04 ns can be achieved.(3)The relationship between code phase and carrier phase of the transponder system is studied.The factors affecting the phase relationship between the two are analyzed.The measurement methods of code phase and carrier phase consistency(referred to as "code carrier consistency")are given.The hysteresis and periodicity of the code-based consistency closed-loop control system of the forward-based system are proposed.The proposed method is used to compensate the code-loaded residual preadjustment method.Order number(4)A key parameter analysis software that affects the forward carrier phase timing is implemented.A new software implementation method for second-order construction is proposed.This method can avoid the generation of semi-finished objects.The software is based on the model view and the second-order construction method.The realization of the software analysis results,and compared with the MATLAB analysis results,the analysis results are the same,and finally build the carrier phase timing test platform,and test the carrier phase timing results,the test results show that the forwarding system carrier phase timing The accuracy is better than 0.5ns.The research content of the thesis is the basic guarantee for implementing the forward carrier phase timing.The design software provides an analysis tool for judging whether the system is running normally.The software design method proposed in the article can provide technical support for other software design fields.