Design of a nanometer five-dimension adjusting frame used for star simulation facility

Aiming at the requirement of an accurate docking between high-accuracy star sensor and star simulator in calibration test, so that to achieve the target of accurately picking up positions of simulation stars, a five-dimension adjusting frame with high resolution and good stability is designed. The functional demands of the adjusting frame are analyzed in depth. In order to reduce docking error and improve alignment efficiency, the general designing program is presented in detail. The three-dimension model of designed frame is given by applying CATIA software. Theoretical calculations show that the adjusting mechanism's displacement resolution is 17.6nm and angular resolution is 0.045 arc second. Experimental tests indicate that stability of the adjusting mechanism is quite high, the actual resolutions are 25nm and 0.1 arc second. Calibration test shows that angular distance errors between stars simulated by star simulation facility are all better than 12″, can totally meet the technical requirements of calibration test for current high-accuracy star sensor.