The ballistic range spatial benchmark device is driven by multiple stepper motor

and under management of control software

center axis of calibration device is adjusted to center position of optical axis. In the Lab VIEW environment

graphical programming language is used to collect analog signal feedbacked by position sensitive detector（ PSD） and transform analog to digital signal by A / D acquisition card. According to signal obtained by serial communication

the upper PC software monitor the spot position signal on the PSD in real-time and control rotation of stepper motor

and realize light spot close to the central axis of calibration device. Stepper motor control system based on PSD has good stability and accuracy

and has been used in ballistic range spatial benchmark device. Calibration results show that calibration error of coordinates is less than 1mm under the control system.