Fig. 1. Overall framework of the distributed coherent-aperture microwave photonic imaging radar

Fig. 2. Configuration of the dynamic reconfigurable waveform generation module

Fig. 3. Results of waveform orthogonality^[28]. (a)Auto-correlation of y₁ and cross-correlation of y₁ and y₂; (b) detail near the main lobe in Fig. 3(a); (c) auto-correlation of y₂ and cross-correlation of y₁ and y₂; (d) detail near the main lobe in Fig. 3(c)

Fig. 4. Schematic diagram and principle of the proposed optical FrFD receiver front-end. (a) Schematic diagram of the optical FrFD receiver front-end; (b) principle of ghost target elimination

Fig. 5. Experimental setup of optical FrFD receiver front-end

Fig. 6. Experimental results of multiple targets detection^[39]. (a) Two corner reflectors placed at different distances; (b) results without ghost target elimination; (c) results with ghost target elimination

Fig. 7. Fiber-optic frequency synchronization network based on phase conjugation. (a) Schematic diagram; (b) spectrum evolution of the phase conjugation

Fig. 8. Frequency synchronization experimental results^[53]. (a) Remote station connected by two 10 km SMF spools; (b) remote station connected by a 5 km SMF spool and a 15 km SMF spool

Fig. 9. Fiber-optic time synchronization network based on TFDT. (a) Scheme diagram; (b) principle of TFDT

Fig. 10. Time synchronization experimental results^[54]. (a) Time difference fluctuation between the local site and the remote site in different time transfer ways; (b) time stabilities obtained in different time transfer ways

Fig. 11. Experimental setup of the microwave photonic time-frequency synchronization network

Fig. 12. Time-frequency synchronization experimental results^[55]. (a) Measured time difference fluctuation of time-frequency signal between the local site and remote sites; (b) frequency stabilities of remote sites; (c) time stabilities of remote sites

Fig. 13. Photographs of the experimental scene. (a) Photograph of the radar transceiver; (b) photograph of the antennas and the target

Fig. 14. ISAR imaging results of rotation platform^[56]. (a)(c) Monostatic mode of radar 1 and radar 2; (b)(d) coherence-on-transmit mode of radar 1 and radar 2; (e) full coherence mode

Fig. 15. Experimental setup and experimental scene^[57]. (a) Experiment setup;(b) experimental scene

Fig. 16. Imaging results of reflectors in different modes^[57]. (a) Monostatic mode; (b) coherence-on-transmit mode; (c) full coherence mode