Near-seabed gravity measuring device and measuring method

Abstract

The invention relates to the technical field of ocean gravity measurement, in particular to a near-seabed gravity measuring device and a near-seabed gravity measuring method. The device comprises a submersible vehicle butt joint base, a relative gravimeter, a relative gravimeter carrying mechanism and an absolute gravimeter base station, wherein the submersible vehicle butt joint base is fixedly connected with a submersible vehicle, and is detachably connected with the relative gravimeter carrying mechanism, a relative gravimeter is fixed on the relative gravimeter carrying mechanism, the relative gravimeter carrying mechanism is detachably connected with the absolute gravimeter base station, and the absolute gravimeter base station is provided with an absolute gravimeter and relative gravimeter carrying mechanism butt joint base. The method comprises the step of realizing near-seabed gravity measurement by using the device. According to the invention, the device is less affected by stormy waves, can ensure the attitude stability, has enough time to realize standing stability, can directly finish reference point comparison underwater, and ensures the accuracy of measured data.

Description

Technical field [0001] The present invention relates to the field of marine gravity measurement, and in particular, a close-in-bottom gravity measuring device and a measurement method are specifically. Background technique [0002] Marine gravity measurement is one of the physical measurement methods of marine geosetic. Gravity measurement is the theoretical basis based on Newton Wanner, to form a gravity change caused by the density difference between the crust and the upper mantle, and the gravity field value of the geosid domain is determined by special instruments, and the gravity distribution characteristics and changes are given. Law, in turn, research geological structure, crust structure, earth morphology, and exploration submarine minerals. [0003] The existing marine gravity measurement usually has two ways. First, the gravity instrument is sinking into the seabed to perform telemetry, that is, near-sea gravity measurement, which is similar to the gravity measurement o...

AI Technical Summary

Problems solved by technology

The second is to place the gravimeter on a ship on the sea surface for observation, but this method is affected by various disturbances due to the movement of the measuring ship and the influence of sea water

When the two kinds of gravimeters are working, they also need to keep their attitudes as stable as possible. Unstable attitudes will lead to data inaccuracy and even instrument damage.

[0005] At present, the near-sea gravity measurement has applied the miniaturized relative gravimeter on the AUV for near-sea gravity measurement, but there are the following problems: 1. During the process of surfacing, diving, release and recovery of the AUV, due to the wind and waves on the water surface The impact cannot guarantee its attitude stability

2. The AUV and the relative gravimeter are fixedly installed. Since the AUV itself adopts the energy mode of its own battery, it cannot be stabilized for a sufficient time after reaching the bottom of the sea.

3. At present, ship-based absolute gravity meters or land gravity reference points are mostly used for data comparison. The reference points are far away from the survey area, so it is difficult to guarantee the accuracy of the data

Images