Side-looking three-dimensional (3D) imaging of cross-track three-aperture sparse array synthetic aperture radar (SAR) based on compressive sensing (CS) is investigated in this paper. Conventional SAR has accomplished high resolution imaging on two-dimensional (2D) azimuth-range plane. Using the array structure in cross-track direction, the height resolution can be obtained and 3D imaging is achieved. Conventional imaging approach and imaging based on compressive sensing are used for imaging processing. The performance of both methods is analyzed. Numerical experiments have been made and simulation results are presented in this paper.

Airborne interferometric synthetic aperture radar (InSAR) may exhibit highly non-linear flight paths, which cause the baseline to vary along the flight paths. In the following, a new airborne InSAR processing method which allows the baseline to vary along the flight paths is presented. It does not come to keep the assumption of a linear acquisition path and one constant interferometric baseline, which is adopted in conventional techniques. In addition, the validity of the proposed method was testified by both simulation and an example of its application.