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基于微分差相关分析和旋转中心定位,提出了用于空间滤波转速遥测中旋转方向的辨识方法。该旋转方向辨识法是将差分空间滤波器中相邻两个光电池的输出信号经微分、相减、取绝对值后再积分计算得到微分差相关值,用其最小值处延时量的符号确定旋转体像在该两光电池处的线速度方向,再依据该线速度方向和旋转中心位置来判定旋转方向。其中的旋转中心位置是利用双差分空间滤波传感器输出信号的两个中心频率及其变化计算系数k,再由k值和较大中心频率对应的差分空间滤波器所在的位置来确定的。仿真分析实验验证了所提出的旋转方向辨识方法简单易实现。该方法对随机相位不敏感,有效地解决了空间滤波转速遥测中的旋转方向辨识难题。
Based on the differential difference correlation analysis and the rotation center location, a method for identifying the rotation direction in the space-filtering telemetry is proposed. The rotation direction identification method is differentiating and subtracting the output signals of two adjacent photovoltaic cells in the differential spatial filter, taking the absolute value and then integrating to obtain the differential difference correlation value, and determining the sign of the delay amount at the minimum value The rotating body is in the line speed direction at the two photovoltaic cells, and then the rotating direction is determined according to the line speed direction and the rotation center position. The center position of the rotation is determined by using the two center frequencies of the output signal of the double differential spatial filter sensor and the variation calculation coefficient k thereof, and then by the position of the differential spatial filter corresponding to the k value and the larger center frequency. Simulation analysis experiment verifies that the proposed rotation direction identification method is simple and easy to implement. The method is insensitive to stochastic phase and effectively resolves the problem of rotation direction identification in space filtering telemetry.