Fig. 1. Rib unit

Fig. 2. Composition of deployable antenna support structure

Fig. 3. Module topology rule

Fig. 4. Envelope circle

Fig. 5. Modeling process of surface accuracy analysis model

Fig. 6. Typical envelope circle

Fig. 7. Calculation process of center coordinates

Fig. 8. Envelope circle number

Fig. 9. Rib unit angles of typical module

Fig. 10. Envelope circle model （61 envelope circles in 5 layers）

Fig. 11. MATLAB simulation results of surface accuracy analysis model

Fig. 12. The relationship between rib unit angle and the parameter r

Fig. 13. Prototype of single module

Fig. 14. Test layout of surface accuracy measurement

Fig. 15. Feature point number

Fig. 16. Comparison of measured and theoretical values

Fig. 17. Error distribution of feature points frequency histogram frequency histogram

Fig. 18. Absolute error of rib unit angle