Progress in the development of buried minehunting systems

Clem,; Lopes, Maria do Carmo

doi:10.1109/oceans.2003.178630

Cited by 10 publications

(3 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These platforms will carry various types of sensors for the purpose of detection and localization of objects, particularly those buried in the sea bottom [1]. A sensor of particular interest for the detection of ferromagnetic (iron, steel) objects is the magnetometer.…”

Section: Introductionmentioning

confidence: 99%

“…The separation baselines can be selected to be in three orthogonal directions, allowing the measurement of a total-field gradient vector. This quantity has important implications for the localization of magnetic targets [1]. The ionospheric magnetic field variations are spatially homogeneous at lower magnetic latitudes, and are removed by the gradient measurement.…”

Section: Introductionmentioning

confidence: 99%

“…The tradeoff is addressed by creating sensors that have extremely low noise levels [2,3]. The U. S. Navy is actively engaged in research for the installation and operation of vector total-field gradiometers onboard UUVs [1].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic sensor operation onboard a UUV: magnetic noise investigation using a total-field gradiometer

Bono

Overway

Wynn

2003

Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492)

View full text Add to dashboard Cite

Abstract-To operate a magnetic sensor on board an Unmanned Underwater Vehicle (UUV), it is necessary to provide a means for compensating magnetic noise from a variety of sources. In previous applications involving passively towed platforms, the noise arises from the magnetic fields due to eddy currents and magnetic polarization changes occurring due to rotation of the platform in the earth's magnetic field. It has been demonstrated that this noise can be compensated with a single vector magnetometer that is rigidly attached to the sensor of interest, measuring the rotational changes in the earth's magnetic field. This compensation algorithm has been extended, for passively towed platforms, to provide both motion noise reduction and localization of magnetic dipole targets, in a single process.On a UUV, noise sources are present in addition to those induced by the earth's magnetic field. There are active elements present, such as current loops, motors, actuators, sonars, and electronic devices. To compensate for these additional sources, it is necessary to add additional reference sensors, and to employ more complex compensation models. In a recent MTS/IEEE Oceans paper, a preliminary investigation of such models was made for several prototype UUVs, for both a fluxgate tensor gradiometer and a single-axis total field gradiometer. The totalfield gradiometer is the most sensitive of the devices and was operated onboard an active Bluefin BPAUV UUV. The UUV was mounted on a three-axis motion table, and the results obtained were encouraging.In the present paper, we apply a multi-reference sensor magnetic noise compensation algorithm to a single-axis totalfield gradiometer operating in the environment of a completely redesigned Bluefin platform, the RELIANT UUV, again mounted on a three-axis motion table. This vehicle has a different configuration from that of the BPAUV, including a very different battery design.We examine in detail the effect of the positioning and number of reference sensors, and show that these issues are critical to performance. We investigate the effect of the positioning of the magnetic sensor relative to other platform systems and find this to be an important issue. Finally we conclude that the performance of the sensor onboard the RELIANT platform using all available reference sensors is roughly the same as that demonstrated onboard the BPAUV.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%