Alarm voting method for three-redundancy system of airplane

The invention provides an alarm voting method for an aircraft tri-redundancy system. The alarm voting method comprises the following steps: collecting a maximum signal value, an intermediate signal value and a minimum signal value corresponding to each channel category; comparing the difference between the maximum signal value and the minimum signal value with a corresponding preset threshold value; judging that three channel signals of the corresponding channel type are all normal when the channel type is smaller than the threshold value, and outputting an intermediate signal value, otherwise, executing the next step; predicting the data of the current sampling period by using a Wiener filter, and calculating a predicted signal value of the current sampling period of the corresponding channel category; comparing differences between the predicted signal value and the maximum signal value, between the predicted signal value and the intermediate signal value and between the predicted signal value and the minimu