Research On Multi-antenna Telemetry Signal Simulator Technology

In the field of aerospace technology and software radio,the traditional telemetry receiving station uses mechanical servo self-tracking antenna to achieve the reception of target signals.However,it only supports the measurement and control of a single target,large size and poor mobility,has gradually failed to meet the needs of social development.The emergence of phased array antenna,not only can quickly track and search for high-speed moving targets,but also can simultaneously measure and control multiple targets.Therefore,this thesis designs a multi-antenna telemetry signal simulator based on phased array technology,which integrates the functions of moving target trajectory simulation and telemetry signal simulation received by different antenna units.It namely can generate telemetry simulated signals,and also can use the upper computer to set parameters and work mode configuration through serial port.In this thesis,the SOC chip and AD9361 chip are used as the core to design and implement the multi-antenna telemetry signal simulator,and the following aspects are mainly done: Firstly,the overall design plan of the multi-antenna telemetry signal simulator system is proposed according to the system function and index requirements,the block diagram of the system design is given,and the system demonstration and chip selection are carried out;Secondly,a multi-antenna telemetry signal simulator hardware circuit platform with Xilinx ZYNQ-7000 series chip as the core is designed and implemented.It mainly includes baseband signal processing design,RF module design of AD9361,control circuit module design,amplitude modulation network module design,phase shift network module design,power supply module design,serial communication module design,etc.Thirdly,the system software is written and simulated with Verilog-HDL language based on Vivado platform,mainly including the design of PCM/FM modulation and Doppler shift,the internal register configuration of AD9361 chip,SPI timing and data interface program design,amplitude-modulation network program design,phase-shift network program design,RS232 serial communication design,etc.On the hardware platform designed in this thesis,the output signal is tested and analyzed by spectrum analyzer,vector network analyzer and oscilloscope,and the simulation of various target trajectories and phased array receiving telemetry signal is realized,which meets the system function index requirements.It can be applied to different application environments and configured according to the actual system requirements,which has certain research value.