正程 meaning in English

forward stroke
trace

First , we calculate out the zero point in a simple numeral method , then we get the phase according to the fact that the symbol of phase changed is opposite in the positive - slope and the negative - slope of triangle wave . this method has the following characteristics : easy to calculate , simple to realize and high precision
首先用简单的数值方法较准确的计算出零点时刻;进而根据三角波扫频时正程和逆程相位变化符号相反的特性,巧妙的完成了相位计算,该方法具有计算简单、实现方便、准确度高等特点。