The Simulation Study Of Steady-state Scanning System

During the stable-state scanning process,the composite detector of the terminal-sensitive bullet has different hit rates for different scanning intervals and scanning speeds of the tank.Therefore,it is great significance for the development of new weapons to do simulation study of the steady-state scanning system.Based on the equation of motion of the stable-state scanning of the terminal-sensitive bullet,this paper proposes a simulation of the steady-state scanning process of the terminal-sensitive bullet using the FPGA controlled stepping motor.The main research contents of this thesis include two points:First,the trajectory of the steady-state scanning process of the terminal-sensitive bullet is a spiral,and it is a circular arc curve projected on the XOY plane.In order to make the stepper motor move as a circular arc curve,the motor must first control speed.In this process,16 different frequencies and non-overlapping pulses are generated by the FPGA.Several of the pulses are superimposed to generate a continuously adjustable output pulse,and the pulse is no longer output when the number of output pulses reaches a specified number,which ensuring the stepper motor runs to the specified position at the appropriate speed.Then,Interpolating the motion trajectory of the stepping motor.During this process,the DDA circular interpolation algorithm is improved,including the left shift normalization processing of the starting point data,and the semi-load processing of the remainder register.The state machine method completes the overall design,effectively improving the overflow pulse speed and interpolation accuracy.Second,to ensure the system can run smoothly and reduce the interpolation error,and the stepping motor is subdivided to reduce the step angle.According to the current vector constant amplitude uniform rotation method and the pulse width modulation principle.In the FPGA design,rectangular pulses of different duty ratio cycles are output to drive the stepper motor to run.At the same time,to improve the measurement accuracy,the system adopts closed-loop control,and the encoder output signal of the feedback link is processed by quadruple frequency.The fuzzy PID control method is selected as the control strategy,and the effect obtained by Matlab simulation is better.Finally,the simulation software,Modelsim,Signaltap and Matlab,are used to jointly verify the speed control module,the improved DDA circular interpolation algorithm and the subdivision design.The output waveform of the speed control module includes a series of parameters such as speed,acceleration and total output pulse number.The improved DDA circular interpolation algorithm directly observes the simulation data of Modelsim in Matlab.The output signals of the subdivision design are observed in Signaltap,including the sine wave stored in the ROM and the output of different duty ratio pulses.The simulation test verifies the correctness of the overall scheme,and provides practical value for studying the stable-state scanning process of the terminal-sensitive bullet.