The results of testing the Chekan gravimeter at the Leningrad gravimetric testing area

Zheleznyak, L. K.; Koneshov, V. N.; Краснов, А. А.; Соколов, А. В.; Elinson, L. S.

doi:10.1134/s106935131502010x

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…A picture of this gravimeter is given in Figure 1 (right). This kind of gravimeter has already been used on various airplanes and ships in many countries and there are consequently many operation experiences with this instrument (e.g., Krasnov, Sokolov, & Elinson, 2014;Krasnov, Sokolov, & Usov, 2011;Zheleznyak, 2010;Zheleznyak et al, 2015).…”

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confidence: 99%

Airborne Gravimetry of GEOHALO Mission: Data Processing and Gravity Field Modeling

Barthelmes

Förste

et al. 2017

JGR Solid Earth

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Airborne gravimetry is a crucial method to improve our knowledge about the Earth gravity field, especially in hard‐to‐access regions. Generally, the accuracy of airborne gravimetry is several milligals, which is suitable for filling the so‐called polar gaps in satellite‐derived global gravity field models. Here some investigations based on airborne gravity measurements from the GEOHALO mission over Italy are presented. To subtract the vertical accelerations from the values measured by the gravimeter, four different versions of kinematic accelerations were derived from Global Navigation Satellite Systems (GNSS) recordings. To remove the high‐frequency noise, a low‐pass filter with a cutoff wavelength of 200 s was applied to both Chekan‐AM measurements and kinematic accelerations from GNSS. To investigate how future airborne gravity campaigns could be designed, a dedicated flight track was repeated two times showing that the equipment worked well also at higher altitude and speed. From the final best results follows an RMS of gravity differences at crossover points of 1.4 mGal, which, according to the law of error propagation, implies the accuracy of a single measurement to be 1.4/2≈1 mGal. To demonstrate how a satellite‐only gravity field model can be improved by airborne measurements, a gravity field model for the GEOHALO region has been computed. To compute also an improved regional geoid model, the point mass modeling (PMM) and the remove‐compute‐restore (RCR) technique, using a recent satellite‐only model and residual terrain modeling (RTM), were applied. Finally, GNSS/leveling points have been used to check the quality of the regional point mass model.

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confidence: 99%

Airborne Gravimetry of GEOHALO Mission: Data Processing and Gravity Field Modeling

Barthelmes

Förste

et al. 2017

JGR Solid Earth

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“…The transfer function of the low-pass filter in the frequency domain can be found in our previous studies [15,16]. A more detailed processing scheme of marine gravimetry with the gravimeter Chekan-AM can be found in the operation manual from the manufacturer and has been shown previously (e.g., [14][15][16][31][32][33][34][35]).…”

Section: Marine Gravimetry Data Processingmentioning

confidence: 99%

Marine Gravimetry and Its Improvements to Seafloor Topography Estimation in the Southwestern Coastal Area of the Baltic Sea

et al. 2022

Remote Sensing

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Marine gravimetry provides high-quality gravity measurements, particularly in coastal areas. After the update of new sensors in GFZ’s air-marine gravimeter Chekan-AM, gravimetry measurements showed a significant improvement from the first new campaign DENEB2017 with an accuracy of 0.3/2=0.21 mGal @ 1 km along the tracks, which is at the highest accuracy level of marine gravimetry. Then, these measurements were used to assess gravity data derived from satellite altimetry (about 3 mGal) and a new finding is that a bias of −1.5 mGal exists in the study area. Additionally, ship soundings were used to assess existing seafloor topography models. We found that the accuracy of SRTM model and SIO model is at a level of 2 m, while the accuracy of the regional model EMODnet reaches the lever of sub-meters. Furthermore, a bias of 0.7 m exists and jumps above 5 m in the SRTM model near the coast of Sweden. Finally, new combined gravity anomalies with sounding data are used to reveal the fine structure of ocean topography. Our estimated seafloor topography model is more accurate than existing digital elevation data sets such as EMODnet, SRTM and SIO models and, furthermore, shows some more detailed structure of seafloor topography. The marine gravimetry and sounding measurements as well as the estimated seafloor topography are crucial for future geoid determination, 3D-navigation and resource exploration in the Baltic Sea.

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Studying the Gravity Field in Hard-to-Reach Areas of the Earth

Koneshov

Погорелов

Соловьев

et al. 2022

Earth Systems Data and Models

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The results of testing the Chekan gravimeter at the Leningrad gravimetric testing area

Cited by 6 publications

References 5 publications

Airborne Gravimetry of GEOHALO Mission: Data Processing and Gravity Field Modeling

Airborne Gravimetry of GEOHALO Mission: Data Processing and Gravity Field Modeling

Marine Gravimetry and Its Improvements to Seafloor Topography Estimation in the Southwestern Coastal Area of the Baltic Sea

Studying the Gravity Field in Hard-to-Reach Areas of the Earth

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