Based on the needs of high-precision positioning by users at this stage, this paper analyzes three common methods of satellite navigation and positioning focus on the differential technology. After the comparative analysis, it was found that the carrier phase differential positioning accuracy can reach the centimeter level of positioning. It is applied to the in-vehicle navigation terminal equipment, and after the test, the data is compared, and the positioning accuracy of the in-vehicle navigation is also in the centimeter level, which can fully satisfy the user's demand for high-precision positioning, and has great application value.