Measurement Error Modulation Method of Horizontal Component of Sea-Air Gravity Disturbance Based on Course Tracking

Abstract

The invention belongs to the field of gravity measurement, and discloses a sea-air gravity disturbance horizontal component measurement error modulation method based on course tracking. According to the method, a course axis rotating mechanism with the function of keeping track of any course angle at 360 degrees is added to a strapdown gravimeter, so that the measurement error caused by the changeof the carrier motion direction can be eliminated, and the measurement accuracy of the gravity disturbance horizontal component can be improved. When a carrier moves from a stationary or mooring state to a surveying area, the rotating mechanism is locked, and the gravimeter follows the carrier to move relative to a navigation system to further enhance the observability of the system. After the carrier arrives at the surveying area, the rotating mechanism tracks a certain course angle until a measurement task ends, and finally, the linear drift of the measurement error of the gravity disturbance horizontal component is corrected according to gravity reference point information. According to the scheme of the invention, the influence of the carrier motion direction on the measurement of thegravity disturbance horizontal component can be eliminated under the premise of increasing the complexity of the system structure as low as possible, and the scheme of the invention has great significance for improving the measurement accuracy of the sea-air gravity disturbance horizontal component.

Description

Technical field: [0001] The invention belongs to the field of gravitational measurement, and relates to a measurement error modulation method of a gravity disturbance horizontal component, in particular to a sea-air gravity disturbance horizontal component measurement error modulation method based on heading tracking. Background technique: [0002] The information of the earth's gravitational field plays a very important role in the fields of geodesy, resource exploration, space science and military technology. Although the irregular distribution of the earth's mass makes the earth's gravitational field a complex conservative force field, overall, the shape of the earth is relatively regular. Therefore, the earth can be modeled as a standard ellipsoid, called the normal earth, and its corresponding earth's gravitational field is called the normal gravitational field. Furthermore, the difference between the actual gravitational field and the true gravitational field is calle...

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Problems solved by technology

[0004] Aiming at the problem that the sea-air gravimeter measures the horizontal component of gravity disturbance due to the influence of the direction of motion and thus generates errors, the present invention proposes a method for measuring the error modulation of the horizontal component of sea-air gravity disturbance based on course tracking, which eliminates the error caused by the direction of the carrier. Improving the Accuracy of Gravity Disturbance Horizontal Component Measurement

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