Fig. 1. Block diagram of the proposed linear FMCW ladar system.

Fig. 2. (a) Frequency spectrum for signal driving the electro-optic modulator and (b) frequency noise spectrum and linewidth of the linear FM laser.

Fig. 3. Coordinate-system transformation.

Fig. 4. (a) Relationship between the signal power and the SNR and (b) result of the frequency resolution measurement.

Fig. 5. (a) Rotating double prisms and (b) its scanning pattern in experiment with 1 km distance.

Fig. 6. Photo of the target scene outdoors and the 3D imaging result.

Fig. 7. Installed 3D coherent ladar system. (a) Flighting Y-5 aircraft and (b) the installed system viewed from inside.

Fig. 8. Satellite image of the flight trajectory.

Fig. 9. Imaging results of the airborne ladar.