Research of Broadband Imaging Technique Based on a Microwave Photonic Radar

High resolution inverse synthetic aperture radar(ISAR) image is becoming increasingly important in target recognition and space situation awareness, however, many problems appear accompanying the high resolution such as the nonideal performance of amplitude and phase of broadband signal, and the migration through resolution cell(MTRC). To reduce the harmful influence caused by the nonideal performance of broadband signal, a millimeter wave radar of good magnitude-phase property, based on microwave photonics technique, has been built, meanwhile, a new form of keystone transform related to the dechirping mode is proposed to compensate the relative moving between different scattering points of target. After that, the 4GHz high resolution ISAR images of standard reflectors and aircraft are obtained by the microwave photonics radar and compensating algorithm, which demonstrates that both the system and compensating method work well.