Research On Key Technology Of TT&C Transponder Ground Station Simulator Based On RF Integrated Chip

In conjunction with the ground station,the TT&C transponder realizes the functions of ranging,telecontrol and telemetry.At home and abroad,a Cortex device from France is used as a ground station device.It can receive RF signals and generate baseband data.The demodulation sensitivity is close to the theoretical threshold.However,it is tested for the entire system.It is not free to develop the detection module according to the different needs of the user.Another ground station simulator system used in our previous model tasks is an NI-based PXI system.It has a large number of equipment modules,a complex architecture,and it is difficult to develop.Therefore,it is of great significance to develop a set of ground station simulator systems that are easy to develop,simple in structure,and can be divided into modules for testing.This article describes a new ground station simulator architecture.Its lower computer uses the architecture of "FPGA platform + RF integrated chip",which is combined with the PC host computer responsible for man-machine interface to realize the overall function of the ground station simulator.The main contents of this paper are as follows:Firstly,the situation of equipment used by ground station simulators at home and abroad was investigated,and their advantages and disadvantages were analyzed.Secondly,According to the model task,the technical specifications of the ground station simulator were proposed,and a ground station simulator system with a simple hardware architecture and rich software functions was set up.According to the model task,the technical specifications of the ground station simulator were proposed,a ground station simulator system with a simple hardware architecture,a rich software function was set up,and a set of error-correctable telecontrol data packets for detecting the telecontrol decoding unit was completed and the telecontrol signal,precision ranging tone signal,and uplink frequency sweep signal that can be used to detect the monitoring and control transponder were completed;The demodulation part of the downlink signal is performed on the MATLAB platform.The simulink simulation of the main carrier tracking,subcarrier demodulation,bit synchronization,ranging tone tracking and phase comparison,and completed the simulation results analysis and verification work.Thirdly,it summarizes the implementation process of this design and reveals the work that the design is yet to be improved.The ground station simulator system described in this article is used for the detection of the monitoring and control transponder.Its hardware structure is simple,the software function is rich,and it has a very good practical value.It is a new idea for the ground station simulator design of the monitoring and control transponder.