Rotating Accelerometer Gravity Gradiometer Post-Compensation
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Solution Overview
Problem
Existing rotating accelerometer gravity gradiometers face significant measurement errors due to installation errors, mismatched scale factors, and circuit gain issues, which current technologies cannot effectively post-compensate for, limiting their precision in motion error correction.
Innovation Solution
A post-compensation method that calibrates motion error coefficients using an analytical model, filters and processes data to remove linear and angular motion errors, and simplifies the design of the online error compensation system by reducing precision requirements, allowing for more accurate gravitational gradient measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If online error compensation is implemented using compensation circuits and mechanical designs, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the error compensation function from the hardware system (compensation circuits and mechanical designs) and relocates it to the data processing stage through post-compensation algorithms. By separating the compensation function from the physical device, the system achieves measurement precision improvement without increasing device complexity
Solution Approach 2:
The patent replaces the mechanical and circuit-based online error compensation system with a data processing-based post-compensation system. Instead of using physical compensation mechanisms, the invention uses mathematical models and algorithms to correct errors after data acquisition, thereby eliminating the need for complex compensation circuits and mechanical designs
2Measurement precision
If high precision online error compensation system is used, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent performs error compensation after data acquisition rather than during the measurement process. By delaying the compensation action until after data collection, the system avoids the need for high precision components during manufacturing, as the compensation is applied through software algorithms that do not require precise hardware implementation
Solution Approach 2:
The patent creates a mathematical model (copy) of the error characteristics and uses this model to correct the measured data. Instead of requiring precise physical compensation mechanisms, the invention uses a computational copy of the error behavior to achieve correction, thereby reducing manufacturing precision requirements
Data Source
AI summary
A post-compensation method for motion errors of a rotating accelerometer gravity gradiometer includes the steps of: during moving-base gravity gradient exploration, recording angular and linear motions of a gravity gradiometer; after the exploration, removing angular and linear motion errors from output data of the gravity gradiometer based on an analytical model of the rotating accelerometer gravity gradiometer; while ensuring that the precision of the gravity gradiometer is unchanged, the post-compensation method for the motion errors may be applied to greatly reduce the requirements of the gravity gradiometer for the precision of an online error compensation system, thereby simplifying the circuit design and mechanical design of the rotary accelerometer gravity gradiometer, and making the rotating accelerometer gravity gradiometer simpler and cheaper.