A5072701397- Geophysics and Gravity Measurements
- Inertial Sensor and Navigation
- Advanced Frequency and Time Standards
- Target Tracking and Data Fusion in Sensor Networks
- Geophysics and Sensor Technology
- GNSS positioning and interference
- Seismic Imaging and Inversion Techniques
- Atomic and Subatomic Physics Research
- Underwater Acoustics Research
- Reservoir Engineering and Simulation Methods
- Scientific Measurement and Uncertainty Evaluation
- Non-Invasive Vital Sign Monitoring
- Hydrological Forecasting Using AI
- Maritime Navigation and Safety
Naval University of Engineering
2022-2025
A dynamic gravimeter with an atomic interferometer (AI) can perform absolute gravity measurements high precision. AI-based measurement is a type of joint that uses AI sensor and classical accelerometer. The coupling the two sensors may degrade In this study, we analyzed cross-coupling effect introduced recovery vector to suppress effect. We improved phase noise interference fringe by factor 1.9 performing marine using optimizing vector. Marine were performed, precision was achieved. external...
The marine atomic interferometric gravimeter is a vital precision instrument for measuring geophysical information, which widely used in mineral resources exploration, military applications, and missile launches. In practical measurements, vibration disturbance an important factor that affects measurement accuracy. This paper proposes the combination of improved complete ensemble empirical mode decomposition with adaptive noise locally weighted regression characterization data. Firstly,...
Cold atom gravimeter is gradually developing towards miniaturization, dynamics and practicality. It of great significance to apply it deep far sea absolute gravity measurement underwater long navigation time high-precision navigation. At present, most cold gravimeters are still in the state laboratory static base or quasi-static measurement, which difficult meet needs dynamic application scenarios. Therefore, research on "static dynamic" interferometric very urgent key. In this paper, basic...
The navigation performance of an autonomous underwater vehicle (AUV) as the main tool for exploring ocean greatly affects its work efficiency. Under circumstance that high-precision GNSS positioning signals cannot be obtained, role Strapdown Inertial Navigation System/Doppler Velocity Log (SINS/DVL) integrated system is becoming more prominent. Due to marine creatures or seafloor topography, DVL prone outliers even failures during measurement. To solve these problems, a LSTM/SVR-VBAKF...
Atom gravimeter (AG) is a kind of high-precision absolute based on atom interference, which can measure gravitational acceleration. Vibration one the important factors limits measurement accuracy. compensation an effective method to reduce impact vibration accuracy and it especially suitable for complex environments. In this article, improved proposed. Based simplified model transfer function, searches optimal parameters through chaotic sparrow search algorithm (CSSA) effectively restore...
As a high-precision gravity measuring device, marine atomic gravimeter is highly sensitive to vibration signals. Accurate measurement and analysis of signal the primary condition realize compensation suppression. Denoising plays crucial role in processing these The signals contain numerous nonlinear nonstationary components. In this paper, denoising method based on improved variational mode decomposition (VMD) was put forward effectively suppress noise. An genetic particle swarm optimization...
Atomic gravimeter has been more frequently applied under complex and dynamic environments, but its measurement accuracy is seriously hampered by vibration-induced noise. In this case, vibration compensation provides a way to enhance the of gravity measurements correcting phase noise that resulted from Raman reflector, improving fitting an interference fringe. An accurate estimation transfer function between reflector sensor plays significant role in optimizing effect compensation. For...
In the atom gravimeter, three Raman pulses are utilized to realize interference of matter waves, and fringes obtained by scanning chirp rate laser during time. Previously, fringe data analysis methods used LS (Least Squares) fit cosine function each minimize standard deviation between estimated value observed group or EKF (Extended Kalman Filter) method obtain estimation gravity value. this paper, we propose a new applied fitting namely, through FPSO (Fitness Particle Swarm Optimization)...
Vibration correction by using an accelerometer to measure vibration is one of the critical technologies for field measurement atom gravimeters. However, often affected temperature and other environmental factors, resulting in a drift signal. Temperature modeling compensation main methods restrain drift. Considering different effects on various temperatures, change rates, rise drop processes, taking rate as inputs, we establish model use positive negative signs indicate temperature. The...