New algorithm for correcting sea and air gravimeter scale value based on repeat line

Abstract

The invention relates to a new algorithm for correcting the sea and air gravimeter scale value based on the repeat line. The main technical characteristics are that a repeat measuring point scale value correction model is established according to the basic mathematic model of airborne gravity measurement; and the most probable estimation value of the scale value deviation is solved according to the principle of least squares and the sea and air gravimeter scale value is compensated. The formation mechanism of the sea and air gravity measuring system error is analyzed and the sea and air gravimeter scale value calibration error is discovered to be one of the main factors causing the systematic measurement deviation, the calculation model and the compensation method of using the repeat measuring line to detect and correct the sea and air gravimeter scale value are utilized, numerical verification is performed on the reasonableness and effectiveness of the method by using the actual airborne gravity observation network data, the test indicates that the algorithm has a significant effect for eliminating the sea and air gravity measuring systematic deviation, and the method is simple and can meet the requirements of the sea and air gravity measurement user.

Description

technical field [0001] The invention belongs to the technical field of marine gravity, in particular to a new algorithm for calibrating sea-air gravimeter grid values ​​based on repeated lines. Background technique [0002] Sea surface shipborne and airborne gravimetry are two main means to obtain information of gravity field in sea area. Sea-air gravimeter is the core equipment of the two measurement modes. The quality of sea-air gravity measurement results will not only be affected by the interference of measurement dynamic environmental effects and data processing modeling errors, but also the technical performance of sea-air gravimeter itself. One of the main factors of observational data quality. The technical performance of the gravimeter depends on the technical level of the equipment manufacturing process and the accuracy of instrument parameter calibration. The error sources mainly come from the dynamic sensitivity of the gravity sensor, the inherent error of the i...

AI Technical Summary

Problems solved by technology

Due to the limitations of the test and operating conditions, there may be some errors in the gravimeter grid value calibrated by the manufacturer; when the gravity sensor has a mechanical failure and needs to be overhauled or replace parts, the gravimeter grid value will change to a certain extent; for use The elastic system acts as a gravimeter for the sensor, and the change of the elastic coefficient with time will also cause the change of the instrument grid value

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