DETERMINISTICALLY-MODIFIED INTEGRAL ESTIMATORS OF GRAVITATIONAL TENSOR

• Published in: Boletim de Ciências Geodésicas
• Main Authors: Mohsen Romeshkani, Mehdi Eshagh
• Format: Article in Journal/Newspaper
• Language: Portuguese
• Published: Universidade Federal do Paraná
• Subjects: : Isotropic Kernels; Gravity Anomalies; Gravity Gradients; Modification; Simulation of Gravitational Tensor; Truncation Coefficients; geo; Fennoscandia
• Online Access: https://doi.org/10.1590/S1982-217020150001000012; https://doaj.org/article/2937f8b4717c481b93347ba9ec4ac210

The Earth's global gravity field modelling is an important subject in Physical Geodesy. For this purpose different satellite gravimetry missions have been designed and launched. Satellite gravity gradiometry (SGG) is a technique to measure the second-order derivatives of the gravity field. The gravity field and steady state ocean circulation explorer (GOCE) is the first satellite mission which uses this technique and is dedicated to recover Earth's gravity models (EGMs) up to medium wavelengths. The existing terrestrial gravimetric data and EGM scan be used for validation of the GOCE data prior to their use. In this research, the tensor of gravitation in the local north-oriented frame is generated using deterministically-modified integral estimators involving terrestrial data and EGMs. The paper presents that the SGG data is assessable with an accuracy of 1-2 mE in Fennoscandia using a modified integral estimatorby the Molodensky method. A degree of modification of 100 and an integration cap size of for integrating terrestrial data are proper parameters for the estimator.