For the problem of high slant-range sampling ratio and huge echo data volume in the high-resolution three-dimensional imaging system of forward-looking array SAR

the joint two-dimensional sparse sampling method in the domain of slant-range frequency and along-track time and its sparse reconstruction method for the three-dimensional imaging of the scene is presented

which is based on the sparse property of the scatterers in the three-dimensional space.From the perspective of forward-looking array SAR to observe the three-dimensional ground

the scatterers in the ground are sparse in the joint space of the slant-range direction and the along-track direction.To avoid the effect of the sparse sampling in the slant-range direction on the three-dimensional imaging

the solution of sub-pulse technique and the sparse sampling in the slant-range frequency is presented to accomplish the sparse sampling in the slant-range direction.Also

the sparse reconstruction method

which is combined with the continuity of the scatterers

is proposed to increase the robustness in the situation of low signal-to-noise ratio.Compared to the traditional imaging method with three-dimensional matched filtering

the method in this paper reduces the slant-range sampling ratio and the echo data volume

and the three-dimensional image can be directly reconstructed using the recovered scatterers.