The invention discloses a multi-
navigation system interoperability positioning method and
system. The method includes the following steps that: (1) a Kalman filtering-based positioning model is constructed; (2) each time
receiver positioning terminates, estimated intersystem
clock difference deviation when current positioning terminates is stored; (3) each time
receiver positioning is performed, if the time interval of current positioning and last positioning is smaller than a preset interval, estimated intersystem
clock difference deviation when the last positioning terminates is adopted, and the positioning model is utilized to perform positioning; and (4) each time
receiver positioning is performed, if the time interval of the current positioning and the last positioning is not smaller than the preset interval, the positioning model is adopted to calculate the change value of intersystem
clock difference deviation at each time point in real time, and the positioning model is adopted to perform positioning. The multi-
navigation system interoperability positioning method and
system of the invention can be applied to multi-
navigation system combined positioning. With the multi-navigation
system interoperability positioning method and system adopted, one receiver clock difference is just required, so that positioning calculation can be performed, and therefore, the problem of incapability of realizing positioning under a situation in which the number of visible satellites is small can be solved.