Upgrade of the GOCE level lb
gradiometer processor.
Gradiometers can significantly reduce the environmental noise, and the reduction ratio of a typical first-order
gradiometer is believed to reach almost two orders of magnitude [6], although the noise reduction capability strongly depends on the precision in sensor manufacturing.
To find the "true, disturbance-free" [B.sub.Earth] of equation (3), we have implemented a least-squares fitting-based algorithm, which relies on reading from a
gradiometer placed close to the street, allowing for detection of the passing cars through the "point of symmetry".
It consists of a vector magnetometer and
gradiometer to measure the surface magnetic field and its temporal variations in this static precursory mission.
We used 204
gradiometer signals among the 306 channels for data analysis because the characteristics of the
gradiometer and magnetometer sensors differ and the signal-to-noise ratio (SNR) of the
gradiometers is better than that of the magnetometers [24].
A geophysical investigation was undertaken in 2013 using ground penetrating radar, a fluxgate dual sensor
gradiometer and metal detector to identify footings or soil disturbance.
Operators of the machine - a fluxgate
gradiometer -had to remove all items of metal before starting the work, so findings were not distorted.
Its '
gradiometer' - the sensitive instrument measuring gravity in 3D - was the first in space and has mapped variations in Earth's gravity with unrivalled precision.
Bussel, "
Gradiometer pick-up coil design for a low field SQUID-MRI system," Magnetic Resonance Materials in Physics, Biology and Medicine, Vol.
This instrument was used with two sensors (in vertical
gradiometer mode).
In order to achieve the mission objectives, GOCE satellite is equipped with a high-precision gravity
gradiometer as well as a GPS receiver (ESA, 1999).
CG mobilised its vessel, Surveyor 2, for the works and deployed a variety of sensors including a Geoswath system, a Seapsy
gradiometer, a Geoacoutics sub-bottom profiler and a boomer system.
