Modified Arc Array SAR 3D Imaging in Vertical Mode

In this paper, Combining the advantages of the helicopter platform being easy to hover in the air, this paper establishes a three-dimensional imaging model for the Arc Array Synthetic Aperture Radar (AASAR) when the aircraft platform takes off and lands vertically, and proposes a corresponding imaging method. The model corrects the spatial position of the three-dimensional data according to the uniform rising motion of the aircraft and the characteristics of the arc array echo signal. By constructing the altitude offset compensation function, the influence of the altitude change on the antenna position is reduced when the platform rises vertically, and the complex movement mode is simplified into a "two-step" model. In the simplified mode, the distance migration correction is performed through the keystone algorithm to realize the 3D imaging in the simplified mode. Finally, the effectiveness of the algorithm is verified by point target simulation.