Fig. 1. Satellite navigation system

Fig. 2. Inertial navigation system

Fig. 3. Low⁃altitude aircraft navigation system⁃level metrology techniques

Fig. 4. Low⁃altitude aircraft navigation instrument⁃level metrology techniques： accelerometer

Fig. 5. Low⁃altitude aircraft navigation instrument⁃level metrology techniques： gyroscope

Fig. 6. Low⁃altitude aircraft navigation environmental adaptability metrology techniques

Fig. 7. Static position and velocity testing device for navigation systems

Fig. 8. Vehicle⁃mounted standard testing device

Fig. 9. Simulation testing device for position and velocity of navigation systems

Fig. 10. Heading static testing system

Fig. 11. Heading angle dynamic testing device

Fig. 12. Attitude angle testing device for navigation systems

Fig. 13. Five⁃axis angular motion testing device