| 摘要 |
PURPOSE:To reduce guantization errors and to improve the measurement accuracy for incident angles by setting the sizes of a slit for taking in of incident light and photodetectors in controlling the posture of an artificial satellite. CONSTITUTION:A photodetecting plate member and photodetectors 23, 230-238 arranged intersecting orthogonally with the longitudinal direction of a slit on said member are provided in a dark room chamber provided with the slit for taking in of solar light. The slit is of such width at which the length (l) of the photodetector 231 corresponding to the min. digit of Gray codes and the width of incident light 32 through the slit are equal, and the length thereof is equal to the length between the respective centerlines of the detectors 230 and 238. The output voltage V231 of the detector 231 is the saw tooth output of the period of the length 2 twice that of the detector 231 wherein the incident light 32 has a peak at the center of the length (l) of the detector 231 with respect to the deviation of an angle theta. The output of a divider 80 corresponds to measured angles and after A/D conversion 82, it is transmitted as Gray codes, whereby the angle measurement of high accuracy is made possible. |
