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The Dual One Way Ranging (DOWR) technique with PRN-code,which can remove the effect of time-asynchronous and improve ranging precision,is widely used in Inter-Satellite-Ranging.The ranging value based on DOWR is delayed,thus can not match the actual distance at the time the value got within a dynamic environment.In this paper,a synchronous ranging algorithm based on combined-process method using Frequency- difference,Time-difference and relative velocity is proposed,which can realize real-time measurement in high precision by the calibration of ranging value.A dynamic model based on DOWR is introduced first.then,a general analytic expression of distance measurement is constructed,which involves the frequency-difference,the time_difference and the velocity between two aerocraft in different receiving patterns.Thus,the distance measurement can be deduced to a certain time,and then,a current-time ranging value would be extrapolated with local pseudo-speed information.The experiments results of certain product demonstrate the effectiveness of the proposed algorithm,the precision of synchronous distance measurement is better than 0.1m in a dynamic environment.