  Radar is the only sensor that can realize target imaging at all time and all
weather, which would be a key technical enabler for future intelligent society.
Poor resolution and large size are two critical issues for radars to gain
ground in civil applications. Conventional electronic radars are difficult to
address both issues especially in the relatively low-frequency band. In this
work, we propose and experimentally demonstrate, for the first time to the best
of our knowledge, a chip-based photonic radar based on silicon photonic
platform, which can implement high resolution imaging with very small
footprint. Both the wideband signal generator and the de-chirp receiver are
integrated on the chip. A broadband photonic imaging radar occupying the full
Ku band is experimentally established. A high precision range measurement with
a resolution of 2.7 cm and an error of less than 2.75 mm is obtained. Inverse
synthetic aperture (ISAR) imaging of multiple targets with complex profiles are
also implemented.

Signal Processing;Instrumentation and Detectors;Optics