Investigation of Fast Reaction SAW (Surface Acoustic Wave) Accelerometer
Abstract
The objective is to develop SAW accelerometers with improved bias stability characteristics for moderately accurate inertial navigation. Methods of fabricating dual-resonator crystals with low absolute and differential aging characteristics have been developed. Tests have been performed at 10 Gs acceleration on integrated noise levels for simulated guidance system mission times of up to 20 min. Error rates less than 15 meters per hour in position of accuracy and velocity error less than 0.013 m/s have been achieved. Sensor device has a frequency stability of part in 10 to the 10th power with a dynamic range of 10 to the 6th power. Simulation shows a bit quantization of 0.0013 m/s and frequency scale factor of 770 Hz/m/sq s can be achieved. The concept of SAW accelerometer is based on construction of a SAW resonator on the surface of a piezoelectric quartz cantilever beam. Acceleration loading of the beam induces a surface strain in the resonator areas, resulting in a deviation of the center frequency. This frequency change is proportional to the acceleration input and it provides an inherent direct frequency digital output for the signal processing of the device.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1985
- Accession Number
- ADA166779
Entities
People
- M. E. Motamedi