Aviation Navigation TDF46A Airborne Optical Gyro Inertial
Navigation
1 Introduction
The airborne optical gyro inertial navigation system employs
fiber-optic gyroscopes (FOGs) and high-precision quartz
accelerometers as its core sensing elements, operating under either
strapdown or modulated system architectures. Utilizing advanced
navigation algorithms processed through embedded computing units,
it achieves real-time inertial parameter calculation at refresh
rates exceeding 200Hz.This system features multi-domain sensor
fusion capabilities, seamlessly integrating satellite navigation
(GNSS), celestial positioning, barometric altimetry, radio
navigation, and visual odometry inputs through adaptive Kalman
filtering techniques. Operational modes can be dynamically
configured between pure inertial navigation and hybrid augmentation
states, delivering comprehensive platform navigation solutions
including 3D position, velocity, attitude, and heading parameters.
2 Application Fields
Suitable for fixed-wing UAVs, rotary-wing UAVs, and specialized
airborne vehicles.
3 Performance Characteristics
Capable of alignment on ground-based vibrating platforms and
in-flight alignment.
Supports switching between self-alignment, moving-base alignment,
and transfer alignment based on customer needs.
Supports multi-sensor fusion, incorporating satellite, celestial,
altimeter, radio, and visual navigation data.
Equipped with system fault detection and alarm functions.
4 Main parameters
| Type | TDF46A |
| Accelerometer | Months Bias Repeatability | ≤20μg |
| Months Scale Factor Accuracy | ≤20ppm |
| Gyro | Bias Repeatability | ≤0.008°/hr |
| Scale Factor Accuracy | ≤20ppm |
| Random walk | ≤0.003°/√hr |
| Features | Position accuracy | Pure inertia | ≤0.8nm/1h |
| Inertial navigation satellite combination | better than satellite accuracy |
| Velocity accuracy | Pure inertia | ≤1.0m/s |
| Inertial navigation satellite combination | ≤0.2m/s |
| Angular Rate | ≥±400°/sec |
| Angular Acceleration | 100000°/sec2 |
| Acceleration | ＞25g |
| Angular Attitude | Any Orientation |
| Alignment time | ≤8min |
| Input/output | 3 RS422 full-duplex serial ports, 1 100M Ethernet port |
| Alignment Time | Time | ＜5min |
| AHRS Applications Performance | Heading Accuracy | Pure inertia | ≤0.1°sec(L) |
| Satellite navigation combination | ≤0.05°sec(L) |
| Pitch & Roll Accuracy | Pure inertia | ≤0.03° |
| Satellite navigation combination | ≤0.015° |
| Characteristics | Power consumption | ＜20W |
| Dimensions | 195×160×108 |
| Weight | ＜3.9kg |
| Temperature | -40℃~60℃ |
| Shock | 15g,Half-sine wave 11ms |
| Input Voltage | DC24V(±25%) |
| Cooling | Conduction to mounting plate |
| Vibration | 20~2000Hz,6.06g |
| MTBF | ＞20000 hours |
