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in view of the big dipper move positioning receiver signal vulnerable to keep out cause cannot real-time accurate positioning problem, for the move location test under the condition of complex signal are studied, this paper proposes a using inertial information auxiliary calculating method of dynamic fuzzy degree, is a kind of moving vehicle inertial navigation information combined with beidou measurement information, between the motion vector precision dynamic relative positioning algorithm. Flux based on carrier phase double difference observation model, adopt the fusion filtering algorithm, discuss the ambiguity solution under different number of satellites. On this basis, the use of field vehicle test completed the orientation of the combination method of test and precision test, later on, for each epoch data to studied the positioning accuracy and availability. Results show that based on the inertial information auxiliary beidou move positioning availability index, slightly improve the positioning accuracy. 