Terahertz isar imaging method and system

A method for terahertz ISAR imaging, comprising:

• transmitting a linear frequency modulation signal from a terahertz ISAR to an imaging target, and receiving an echo signal sr(t,u) by the terahertz ISAR, the imaging target moving at a preset speed;
• setting a target reference position, and acquiring a reference signal s0(t) according to the target reference position;
• using the reference signal s0(t) to perform a matched filtering in a fast time domain on the echo signal sr(t,u) to obtain a data matrix SM(ω,u);
• performing a baseband transformation in a slow time domain on the data matrix SM(ω,u) to obtain a baseband transformed data matrix Sb(ω,u) and a corresponding signal spectrum Sb(ω,ku);
• correcting the baseband transformed data matrix Sb(ω,u) to eliminate a fast time domain zero offset, thereby obtaining a corrected data matrix S(w,ku);
• using a phase function of the reference signal to perform another baseband transformation on the corrected data matrix S(ω,ku) to obtain a first target function F(kx,ky);
• discretizing the first target function F(kx,ky) to obtain F(kxmn,kymn), and interpolating on a kxmn domain to uniformly distribute the F(kxmn,kymn) on the kxmn domain;
• and
• performing an inverse transformation on the interpolated first target function to obtain a second target function ƒ(xn,yn) to generate a two-dimensional image of the imaging target.