Locata positioning technology is the substitute technology of GNSS in the invisible environment or unavailable situation.As is shown by many studies, centimeter-level positioning accuracy can be achieved with carrier phase measurement by Locata positing technology.In Locata system, the float carrier phrase ambiguity can be obtained at a precise coordinate point with the initializing method.However, in many cases, Locata carrier phase integer ambiguity needs to be resolved in real-time.In the real-time resolution of Locata carrier phase integer ambiguity, an online resolution method based on TIKHONOV regularization principle and LAMBDA searching method is used to solve the problems such as singular equation.Simulation analysis shows that correct integer ambiguity resolution can be obtained by using the method.