Fig. 1. Schematic diagram of pyramid sensor

Fig. 2. Picture of 7-unit segmented mirrors.(a) Mirrors; (b) self-made mask

Fig. 3. Schematic diagram of curve fitting experiment of pyramid sensor

Fig. 4. Relationship between the signal of pyramid sensor and piston error (in wavelength) and sinusoidal fitting curve

Fig. 5. Comparison between measured value and real value of piston errors

Fig. 6. Comparison of 7-aperture synthetic imaging systems before and after co-phasing.(a) Far-field spot before co-phasing; (b) strength distribution in xOz section before co-phasing; (c) strength distribution in yOz section before co-phasing; (d) far-field spot after co-phasing; (e) strength distribution in xOz section after co-phasing; (f) strength distribution in yOz section after co-phasing

Fig. 7. RMSE and PV values for multiple experiments

Table 1. Values of A, B and C obtained from multiple experiments and the corresponding RMSE