An error test and compensation method of infrared guidance hardware-in-the-loop system by self-calibration device

An error test and compensation method of infrared guidance hardware-in-the-loop system by self-calibration device and flight motion simulator was proposed. The optical system of the unit under test and infrared scene projector were combined into a synthesis optical system. After the pupil function of synthesis optical system reconstructed, Fourier-optics method and ray-tracing method were adopted to analyze the effect on PSF and MTF caused by “offset error” and “tilt error”. The analysis results showed that the MTF were higher than 0.4 in spatial frequency of 30 (lp/mm), when the system has offset error below 5 mm and tilt error below 0.3°. However, the tilt error would affect the position of the PSF, and it should be eliminated. To eliminate the tilt error, a self-calibration device was designed, and the tilt error compensation method by adjusting the flight motion simulator was described. Finally, the experiment results showed that the accuracy of the simulation results was improved obviously after the compensation.