The result of positioning precision test shows that the positioning precision of the GPS real timedifferential system based on GPRS has attained cm-level.
实际测试结果表明：基于GPRS的GPS实时差分系统达到了厘米级定位精度。
2
In this paper, the principle of transit-timedifferential method of ultrasonic flow measurement is introduced along with the discussion of its advantages and disadvantages.
本文讨论了时差法成品油超声波流量计的基本原理、优缺点等。
3
Based on measured data of micro silicon gyro and time-series theory, the AR model of gyro static drift is established, then the continuous-timedifferential equation is got.