Research And Development Of Radar Seeker Servo System

The seeker servo control system is a vital part of the missile’s precise guidance.We have made major breakthroughs in the field of servo control in recent years,but there is still a long way to go from the international advanced level in miniaturization and integration.This research comes from a radar seeker servo control system development project.In view of the problem of insufficient electrical layout space of the system,we give a scheme of a highly integrated servo control system integrating control,decoding and driving,which reduces the space required by board cards,simplifies the electrical interconnection mode and reduces the cost.The main content of the article is as follows:First,we design the overall scheme according to the system functions and performance indexes,and propose the hardware architecture design mode of DSP+FPGA.Then through the calculation of the load torque of the system,the selection of the main components in the system is completed.Finally,the control loop model of the system is designed and the feasibility of the system is verified by simulation.Second,we analyze and simulate the signal integrity of system circuit for all kinds of signal quality problems caused by high density board.The causes of reflection and crosstalk of single-ended signals are analyzed,and the suppression methods are proposed.From this,the reflection and crosstalk problems of differential signals are simulated and analyzed.According to the simulation results,the signal integrity improvement strategy of circuit is proposed and applied to actual PCB board.Third,considering the requirements of system functions and indicators,we proposed an integrated circuit scheme of control,decoding and driving,and complete the design of multifunctional integrated control board of the system based on the signal integrity improvement strategy proposed above.Fourth,for the complex functional requirements of the multifunctional integrated control board,we implement the development of interface software based on FPGA and control software based on DSP.We specifically complete the design and simulation of clock module,RDC module,data communication module and XINTF interface module in FPGA,and the design of motion function module,PID algorithm module and driver module in DSP control module.Last,we conduct joint debugging of the servo control system.The hardware functions of the system are tested,and then the system functions and performance indicators are debugged with the control algorithm.