Magnetic Sensor Operation Onboard a UUV: Magnetic Noise Investigation using a Total-Field Gradiometer

نویسندگان

  • J. T. Bono
  • D. J. Overway
  • W. M. Wynn
چکیده

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.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Noise Equivalent Power Optimization of Graphene- Superconductor Optical Sensors in the Current Bias Mode

In this paper, the noise equivalent power (NEP) of an optical sensor based ongraphene-superconductor junctions in the constant current mode of operation has beencalculated. Furthermore, the necessary investigations to optimize the device noise withrespect to various parameters such as the operating temperature, magnetic field, deviceresistance, voltage and current bias have been presented. By s...

متن کامل

Performance Evaluation of AHRS based MEMS for Unmanned Underwater Vehicle

Generally, underwater unmanned vehicle (UUV) have adopted an inertial navigation system (INS), dead reckoning (DR), acoustic navigation and geophysical navigation techniques as the navigation method because GPS does not work in deep underwater environment. Although the tactical inertial sensor has been usually used at UUV for precise control during long operation time because the sensor can pro...

متن کامل

Scanning hall probe microscopy technique for investigation of magnetic properties

Scanning Hall Probe Microscopy (SHPM) is a scanning probe microscopy technique developed to observe and image magnetic fields locally. This method is based on application of the Hall Effect, supplied by a micro hall probe attached to the end of cantilever as a sensor.  SHPM provides direct quantitative information on the magnetic state of a material and can also image magnetic induction under a...

متن کامل

Scanning hall probe microscopy technique for investigation of magnetic properties

Scanning Hall Probe Microscopy (SHPM) is a scanning probe microscopy technique developed to observe and image magnetic fields locally. This method is based on application of the Hall Effect, supplied by a micro hall probe attached to the end of cantilever as a sensor.  SHPM provides direct quantitative information on the magnetic state of a material and can also image magnetic induction under a...

متن کامل

Double Relaxation Oscillation SQUID Systems for Biomagnetic Multichannel Measurements

Multichannel superconducting quantum interference device (SQUID) systems based on double relaxation oscillation SQUIDs (DROS) were developed for measuring magnetocardiography (MCG) and magnetoencephalography (MEG) signals. Since DROS provides large fluxto-voltage transfer coefficients, about 10 times larger than the DC SQUIDs, direct readout of the SQUID output was possible using compact roomte...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2009