To prevent the computation of project matrix, the measurements are compensated by using the estimated gross error magnitudes after each gross error is identified, and after that, MT (measurement test) method is used to find the gross error candidates.

• 并且通过对显著误差进行逐步的幅度补偿，再采用MT（测量残差检验）法找出候选显著误差集，避免了投影矩阵的计算。