Fig. 1. Orientation schematic of distributed measurement system

Fig. 2. Schematic of wMPS measurement. (a) Single station angle measurement principle; (b) multi-station intersection measurement principle

Fig. 3. Measurement model of biaxial inclination sensor

Fig. 4. Datum length orientation model based on dip angle sensing

Fig. 5. Initial value solution method

Fig. 6. Simulation results of point position error. (a) z=-0.5 m; (b) z=0 m; (c) z=0.5 m; (d) z=1.0 m

Fig. 7. Simulation result of length error

Fig. 8. Experimental scene

Fig. 9. Length error results

Fig. 10. Orientation stability test. (a) Connecting line of reference ruler is parallel to baseline; (b) connecting line of reference ruler is perpendicular to baseline; (c) connecting line of reference ruler should be at certain angle to baseline 1; (d) connecting line of reference ruler should be at a certain angle to baseline 2

Fig. 11. Experimental results of orientation stability