路径无关算法是一类重要的相位解包裹算法，其中最常用的是各种最小二乘算法。由于最小二乘算法无法限制误差在空间中传播，因此不能直接获得精确的解包裹相位，其应用受到了限制。分析最小二乘相位解包裹算法误差的特点，提出了一种能得到精确解包裹相位的新算法，给出了相关的理论分析和具体算法，通过模拟计算和实验验证，证明了该新算法的可行性与有效性。

The path independent algorithm is one of the important phase unwrapping algorithms, and diverse types of least-squares phase unwrapping algorithms are used widely. Since least-squares phase unwrapping algorithm does not hold back the error diffusing in space, an accurate unwrapped phase cannot be obtained by this algorithm directly, which limits the applications of the algorithms. A novel accurate phase unwrapping algorithm and the corresponding theoretical analysis are presented by analyzing the error characteristics of least-squares phase unwrapping algorithm. The validity of this new algorithm is shown by simulation and experimental examples of unwrapping, and the obtained phase proves that this new algorithm is accurate.