Method for narrowband passive radar three-dimensional imaging

The invention discloses a method for narrowband passive radar three-dimensional imaging. The method includes a first step of establishing a three-dimensional imaging model under a rotary table model, a second step of deriving signal slant range course under three-dimensional rotation, a third step of deriving and discretizing an echo signal model, a fourth step of constructing a four-dimensional signal matching matrix and an echo signal matrix based on the echo signal model, and a fifth step of obtaining Hadamard product of the signal matching matrix and the echo signal matrix and obtaining sum in a time dimension. Compared with a common InSAR three-dimensional radar imaging technology, the method employs passive radar technology and ensures high survival capability. An inverse synthetic aperture radar (ISAR) imaging mode is employed to image an object in the air, and improve the capability of monitoring the object in the air. The system has no transmitter and is low in cost.