Oil contamination has a detrimental influence on the spaceborne quasi-absolute optical encoder because it introduces errors in angular displacement measurement. To reduce these errors and prevent the failure of the spaceborne quasi-absolute optical encoder caused by oil contamination, this paper proposes a multi-reference identification algorithm for the absolute angular displacement and a multi-reading-head data fusion algorithm. First, the composition of the spaceborne quasi-absolute optical encoder and the design of the processing circuit are introduced. Second, a multi-reference identification algorithm of the absolute angular displacement is proposed to prevent the misidentification of absolute angular displacement due to oil contamination. Moreover, a multi-reading-head data fusion method was employed to determine and eliminate the erroneous reading head measurement data. The effectiveness of this method was verified by experimentally comparing the angular displacement curves and angular velocity curves obtained from a quasi-absolute angular displacement measuring device, with and without the application of the proposed method. The effects of oil contamination on the accuracy of measurement were also compared. The results indicated that after application of the method, the error in the angular displacement measured by the code disk due to oil contamination was significantly reduced, ensuring the correctness and reliability of the angle-displacement measurement, although the accuracy of measurement was still slightly influenced. Thus, the proposed method is considered to have practical value for making the spaceborne quasi-absolute optical encoder better against the influence of oil contamination.

油污染对星载准绝对光学编码器具有不利影响，因为它会引入角位移测量误差。为了减少这些误差，防止星载准绝对式光学编码器因油污污染而失效，提出一种绝对角位移多参考辨识算法和多读数头数据融合算法。首先介绍了星载准绝对光学编码器的组成和处理电路的设计。其次，提出了绝对角位移的多参考识别算法，以防止由于油污染而导致绝对角位移的误识别。此外，采用多读数头数据融合方法来确定和消除错误读数头测量数据。通过对准绝对角位移测量装置应用和不应用该方法获得的角位移曲线和角速度曲线进行实验比较，验证了该方法的有效性。还比较了油污染对测量精度的影响。结果表明，应用该方法后，码盘测量的角位移因油污而产生的误差明显减小，保证了角位移测量的正确性和可靠性，但测量精度仍受到轻微影响。 。因此，该方法被认为对于使星载准绝对光学编码器更好地抵抗油污染的影响具有实用价值。