什么是相位解卷绕
Q = unwrap(P)
Q = unwrap(P) corrects the radian phase angles in a vector P by adding multiples of ±2π when absolute jumps between consecutive elements of P are greater than or equal to the default jump tolerance of π radians. If P is a matrix, unwrap operates columnwise. If P is a multidimensional array, unwrap operates on the first nonsingleton dimension.
简单翻译一下，就是
当P的连续元素之间的绝对跳跃大于或等于标准弧度的默认跳跃容忍度，也就是 π \pi π时，通过增加