Method and device for underwater topographic survey of shallow water

Abstract

The invention provides a method and device for underwater topographic survey of shallow water. The device comprises a GNSS (global navigation satellite system) base station, a movable operating carrier, a worktable, a GNSS mobile station, an IMU (inertial measurement unit), an angle rotary encoder, a divining rod and a data storage chip, and the worktable, the GNSS mobile station, the IMU, the angle rotary encoder, the divining rod and the data storage chip are arranged on the movable operating carrier. A metal ball is fixed to one end, extending underwater, of the divining rod and directly contacts with the underwater terrain. According to the survey method, the mechanical divining rod directly contacts with the underwater terrain, and data abnormality in acoustic or optical underwater survey is avoided; by the GNSS mobile station, the IMU and the angle rotary encoder combined moving trail acquisition techniques, underwater topographic data are dynamically acquired, and accordingly underwater topographic survey precision and efficiency are improved.

Description

technical field [0001] The invention relates to the field of underwater terrain measurement, in particular to an underwater terrain measurement device and method for shallow water areas. Background technique [0002] Underwater topographic survey is an important operation content of engineering surveying and mapping such as marine surveying, waterway surveying and lake surveying and mapping. Underwater topographic survey mainly includes two parts: positioning and sounding. Water positioning means mainly include optical instrument positioning, radio positioning, satellite positioning and combined positioning, etc. Water sounding means mainly rely on echo sounder. [0003] For underwater terrain surveys in shallow water areas, currently more commonly used methods include: manual use of GNSS RTK and probe rods for single-point positioning and sounding. This method has low operating efficiency, high labor costs, and a great threat to personnel safety and equipment safety. ; Or...

AI Technical Summary

Problems solved by technology

[0003] For underwater terrain surveys in shallow water areas, currently more commonly used methods include: manual use of GNSS RTK and probe rods for single-point positioning and sounding. This method has low operating efficiency, high labor costs, and a great threat to personnel safety and equipment safety. ; Or use the acoustic measurement method, but this method is susceptible to interference in shallow water areas. Once the acoustic equipment leaves the water surface in shallow water areas, normal data cannot be obtained, resulting in abnormal data and low measurement accuracy; or use mobile GNSS RTK and laser ranging The single-point measurement method, the acquisition frequency of this method is low, and the laser is easy to cause interference in the shallow water area with complex water quality, it will also cause abnormal data and low measurement accuracy

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