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A gyro-stabilized platform leveling loop for marine gravimeter.

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A new ultra-low-frequency platform leveling loop enhances marine gravimeter performance by suppressing horizontal accelerations. This system improves data quality and collection efficiency for high-resolution gravity surveys in deep oceans.

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Area of Science:

  • Geophysics
  • Oceanography
  • Control Engineering

Background:

  • High-resolution gravity measurements are crucial for deep ocean surveys.
  • Existing marine gravimeters face challenges with platform stabilization and horizontal accelerations.
  • Accurate gravity data requires minimizing sensor leveling errors.

Purpose of the Study:

  • To design and implement an ultra-low-frequency platform leveling loop for a marine gravimeter.
  • To improve the accuracy and efficiency of gravity measurements in deep ocean environments.
  • To evaluate the performance of the developed system under open sea conditions.

Main Methods:

  • A mixed sensitivity H-infinity approach was used to design the platform leveling loop.
  • The system was applied to a prototype two-axis gyro-stabilized platform marine gravimeter (CHZ-II).
  • Field tests were conducted in the South China Sea, involving sixteen survey traverses.

Main Results:

  • Horizontal accelerations were suppressed by approximately 60 dB between 0.05 and 0.5 Hz.
  • Platform stabilization time was reduced to about 3 minutes, enhancing data collection efficiency.
  • Root mean square repeatability of pitch and roll off-level angles were below 10 and 20 arc seconds, respectively.
  • Leveling errors contributed less than 0.3 mGal to the overall gravity measurement error.

Conclusions:

  • The developed ultra-low-frequency platform leveling loop effectively improves marine gravimeter performance.
  • The system enhances data quality by significantly reducing horizontal acceleration effects.
  • The enhanced stabilization and accuracy make the system suitable for regional deep ocean gravity surveys.