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The GNSS receiver performs real-time satellite differential positioning and broadcasts RTK differential data as an RTK base station when GNSS mobile base station technology is applied in port and waterway engineering, by conducting a series of tests to evaluate the RTK positioning performance of the rover station. A test scheme about real-time dynamic positioning was developed by selecting a typical port and waterway engineering area located at the Yangtze River estuary. Referring to the synchronous PPK positioning results, the accuracy and influencing factors of RTK rover station and the stability of zero baseline in real-time dynamic positioning mode were analyzed. The experimental shows that the N and E directions of the RTK rover station can converge within 3 min, and the deviation RMS is less than 1.0 cm within 20 min after convergence; The H direction can converge within 4 min, and the deviation RMS is less than 3.0 cm within 20 min after convergence. When the relative distance between the mobile base station and the RTK rover station is too large or the relative height difference is suddenly reduced, the RTK rover station is prone to poor positioning. The difference in Nor E directions of the zero baseline positioning of two rover stations kept at millimeter level and the difference in H direction is less than 依1.5 cm, indicating high stability in positioning and orientation. [ABSTRACT FROM AUTHOR]

In the process of construction operation，to solve the sudden failure of equipment， need strong professional knowledge and the universal of equipment accessories. Combined with the actual cases in the application of fault handling equipment，we discussed six kinds of difficult and frequent mechanical failure in the construction site, provided efficient feasible emergency treatment, which can eliminate mechanical failure in a short time to restore the normal operation of the machinery and equipment, and can provided references for the mechanical failure of emergency repair. [ABSTRACT FROM AUTHOR]