Towards Real-Time Accelerometer Bias Calibration: FY21 Status Update For Strapdown Gravity Aided Inertial Navigation System (GAINS)
Abstract
With the goal of eventually enabling strapdown gravity aided inertial navigation, a means to compensate for the bias drift of a frequency modulated (FM) accelerometer is discussed. Background information on current methods for mobile gravity gradient detection, FM accelerometers, and their relations are outlined. A simple overview of parts fabrication using a commercial process is given. Important issues and design choices are noted. With regards to enabling large-amplitude frequency control, see the references in that section and the associated technical report. Next, device modeling is given with means to simulate accelerometer response. This model was then used to demonstrate a means to observe and compensate for bias drift. The report then transitions to experimental efforts. Simplified schematics of the experimental setup and electronics are given. For greater detail on the electronics, see the associated technical report referenced in that section. Using this apparatus, data was collected and processed. Methods to compensate for both long-term and short-term drift were noted. Using these methods, the estimate bias instability is about 180 ng, which is fairly respectable for a first iteration of a silicon-based accelerometer.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2022
- Accession Number
- AD1158670
Entities
People
- Andrew Sabater
- Eric Bozeman
- Stephen Hobbs
Organizations
- Naval Information Warfare Center Pacific