The Research Of The Optical Navigation Sensor Calibration System’s Alignment Method

Optical navigation sensor calibration system is a kind of simulating the stars in the sky, on the optical navigation sensor ground calibration equipment. This paper first introduces the development background, foreign and domestic development history and current situation of optical navigation sensor calibration system. By analyzing the structure of the optical navigation sensor calibration system, the paper put forward the alignment scheme of it, and measures the angular distance between stars.Optical navigation sensor calibration system is aligned according to the principle of edge loading and measuring at the same time. With long focal length and large field projection optical system for collimating lens as a benchmark, the system generates optical axis, and then sequentially steers the plane mirror, prism, and star target alignment. The definition method can serve to determine focal plane, and the change the location of chart target, along the direction of the optical axis, so as to position the star target in the focal plane of long focal length and large field projection optical system. Through the star target, beam splitter prism, steering plane mirror, and long focal length and large field projection optical system, the light emitted by single point controllable matrix type LED illumination system will be projected parallel light to form the star map at the exit pupil of the optical system. Thus it completes the star image simulation.The error of the angular distance between stars is the main norm to measure the precision of optical navigation sensor calibration system. Regarded the theodolite as a tool, the paper introduces the measuring principle of the angular distance between stars of optical navigation sensor calibration system which guided by the theodolite, and states the measurement procedures in detail, and presents the measured data. Through the analysis on the experimental results, the paper verifies that the angular distance between stars generated by the optical navigation sensor calibration system meets the design requirements.