Abstract:In this paper, ellipsoidal constraints are used to describe the bounded prior information of observation vectors and parameters, which are incorporated into the measurement adjustment model. A new adjustment criterion is established to suppress discomfort. Simulation examples and ill-conditioned data of the distance-measuring network are given to show the advantages and disadvantages of ellipsoidal constraint algorithm and other methods,and verify the validity of the bounded ellipsoidal uncertainty adjustment method in dealing with ill-posed problems.