ISAR ship target imaging method based on MPT-MDPT

The invention discloses an ISAR ship target imaging method based on MPT-MDPT. The ISAR ship target imaging method comprises the following steps that an ISAR radar transmits and receives echo signals;demodulation and range-direction matched filtering processing are sequentially carried out on the echo signal; envelope alignment is carried out, and phase compensation is carried out by using a multi-dominant-explicit-point method; the estimated value of the frequency modulation rate is obtained by using a discrete polynomial phase transformation technology, and traversal search is not needed, sothat the calculation burden is greatly reduced, and real-time processing is facilitated; the mean value of the frequency modulation rates under different delays is solved by using a multi-delay technology to serve as a final estimation value, so that estimation errors can be reduced; aiming at the condition that a plurality of scattering points exist in one distance unit, the main peak tracking technology can be used for