光电校靶中捷联惯导轴线的表征校准方法

光电校靶采用捷联惯导系统，需将惯导轴线用光电自准直系统表征捷联，用于对设备轴线的测量。光电自准直系统所表征的轴线与惯导轴线的一致性是影响校靶精度的重要因素，为提高光电校靶系统测量精度和效率，提出了一种惯导轴线的光电表征和校准方法。该方法是在分析测量结果偏差与一致性关系的基础上，采用实验数据拟合的方式得到自准直系统光轴与惯导轴之间的角度偏差值，用于系统修正，从而实现高精度校准。通过试验，将传统光机校正法和光电校准法结合使用，可大幅度提高系统校正效率，同时得到惯导与光轴一致性精度在15″以内。试验结果表明，与传统光学平晶引出的光机校正法相比，该方法的表征准确度和校准精度更高，适用于高精度惯性测量系统。

Characterization calibration method of strapdown inertial navigation axis in photoelectric target calibration

The strapdown inertial navigation system is generally used for photoelectric target calibration. The inertial navigation axis should be characterized by the photoelectric auto-collimation system for the measurement of the equipment axis. The consistency between the axis characterized by the photoelectric auto-collimation system and the inertial navigation axis is an important factor affecting the target calibration accuracy. In order to improve the measurement accuracy and efficiency of the photoelectric target calibration system, a photoelectric characterization and calibration method of the inertial navigation axis was proposed. This method was based on the analysis of the relationship between the deviation and consistency of the measurement results, and the angle deviation value between the auto-collimation system optical axis and the inertial navigation axis was obtained by fitting the experimental data, which was used for the system correction, so as to realize the high-precision calibration. Through the test, by combining the traditional optical machine correction method with the photoelectric calibration method, the calibration efficiency of the system could be greatly improved, and the consistency accuracy between the inertial navigation axis and the optical axis was less than 15″ at the same time. The experimental results show that compared with the traditional optical machine correction method by the traditional optical flat-crystal, the proposed method has higher characterization accuracy and calibration accuracy, which is suitable for high-precision inertial measurement system.