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Dang L.-P.,Northwestern Polytechnical University | Tang S.-G.,Institute of Surveying and Mapping in Xian | Zhou Z.,Northwestern Polytechnical University
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2010

To reduce influence of quadrant detector output signal nonlinear error on the system precision, a matched condition was given to ensure maximum linear interval of detector output signal, and characteristic optimization of detector output signal by subsection linearization method was put forward. In the paper, a mathematical model of quadrant detector output signal was established by light energy integral. Based on the model, the relations were analyzed between linear characteristic of signal with radius ratio of spot to photosensitive area, signal sampling precision and non-uniform of photoelectric transform coefficient and so on. Then, matched condition was acquired which is most proper for radius ratio of spot to photosensitive area corresponding to maximum linear interval of detector' output signal. And the optimum linearity characteristic parameters of detector' signal were gotten by subsection linearization fitting. The simulation result shows that, compared with multi-calibration and least square fitting in entire linear interval methods, max and mean of nonlinear errors in entire linear interval are nearly reduced to 1/10 of the method's mentioned previously, and accordingly, the linear interval of detector is expanded 20%~30% under the same condition. Source


Dang L.-P.,Northwestern Polytechnical University | Tang S.-G.,Institute of Surveying and Mapping in Xian | Zhou Z.,Northwestern Polytechnical University
Guangzi Xuebao/Acta Photonica Sinica | Year: 2010

Combining quadrant detector and fast steering mirror, a new measuring method of the positional error of laser beam on moving platform is proposed. In this method, the fast steering mirror is used to stabilize axis direction of outputting laser beam and the quadrant detector is used to measure the corresponding change of return laser position, then the coupling action between fast steering mirror and the movement of tracking platform is separated in order to get the angle between laser axis and line-of-sight of target. According to this, it can be concluded that the axis of the laser at the target steadily and guide the missile attacking precisely. This method is suitable for real time processing and it is suitable to the laser guided weapons with second class guiding time at last stage trajectory. Source

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