54 results about "Geopotential model" patented technology

The invention provides a GPS leveling height transfer method, which comprises the following steps of: S1: creating a regional gravity quasigeoid model based on the Molodensky theory according to ground gravity observation data by combining with a regional digital terrain model and a global gravity field model; S2, obtaining a reference system difference between a GPS geodetic height and a leveling height and a height anomaly correction term influenced by the reference system difference through a GPS leveling overdetermined boundary value method, and creating a practical quasigeoid model according to the gravity quasigeoid model, the height anomaly correction term and the preset GPS leveling height anomaly system deviation; S3, obtaining a normal height of a pointed to be measured of a region to be measured according to the gravity observation data and the practical quasigeoid model. The method can implement that the GPS leveling replaces a trigonometric leveling or a conventional leveling to meet the transfer accuracy of a two-stage leveling height difference.

The invention belongs to the field of gravity measurement, specifically discloses a strapdown gravimeter horizontal component measurement error correction method through utilization of an earth gravity field model and aims at eliminating a low frequency error in a gravimeter measurement result horizontal component. The low frequency error results from an attitude error. The method comprises the steps of (1), preprocessing original data of a strapdown airborne gravimeter; (2), processing the original data of a GNSS to obtain carrier position, speed and acceleration information; (3), carrying out combined Kalman filtering on the strapdown gravimeter and the GNSS to obtain specific force; (4), computing difference between a specific force result and carrier acceleration of the GNSS to obtaina gravity vector estimated result; (5), carrying out lowpass filtering on the gravity vector result to eliminate a high frequency noise; and (6), carrying out highpass filtering on the gravity vectorresult to eliminate a low frequency part comprising the attitude error and replacing the low frequency part through utilization of a computing result of the earth gravity field model, thereby obtaining a horizontal component estimated result in which the attitude error is eliminated. The method is characterized by good theoretical basis, high operability and simple realization.