A holographic pulse compression technique employing amplitude modulation

This letter discusses a pulse compression technique suggested earlier by Tuttle which modulates the amplitude of a long duration pulse instead of its frequency (as in the "chirp" process). The modulation code is that of a zone plate; the echoes are recorded photographically, and then reconstructed optically, as in side-looking radar, thereby circumventing the need for the complicated matched filters of the chirp process.