Abstract
Radar coincidence imaging (RCI), used in conjunction with a uniform circular array (UCA), is presented in this paper. When performing two-dimensional (2-D) imaging for a target, using RCI in conjunction with a uniform linear array (ULA), in three-dimensional (3-D) coordinates, the symmetry phenomenon occurs in certain situation. To overcome this problem, using RCI with a UCA is proposed. First, the symmetry phenomenon of RCI with a ULA and the causes are introduced. Then, the RCI method with a UCA is presented, the signal model is given based on the UCA, and the imaging method is introduced. Finally, the general relationship between the resolution of RCI with a UCA and the independent characteristic of the reference radiation field is analyzed. In view of this, RCI with a UCA has better adaptability to 2-D imaging in 3-D coordinates. Simulation results validate the theoretical analysis and the imaging method.
Highlights
As a method for all-weather, all-day and long-range information acquisition, radar imaging has more advantages than optical imaging and has been widely utilized in civilian and military applications [1]–[6]
A synthetic aperture radar (SAR) or an inverse synthetic aperture radar (ISAR) requires the translational or rotational motions of a target in the azimuth positions corresponding to the radar; this introduces challenges for motion compensation
Using radar coincidence imaging (RCI) with a uniform linear array (ULA) in 3-D coordinates manifests an interesting phenomenon: when the ULA is not within the plane that the selected imaging area is located in, and the imaging area is symmetrical with respect to the projection line generated by the ULA alignment projecting in this plane, symmetrical images are formed in the imaging area
Summary
As a method for all-weather, all-day and long-range information acquisition, radar imaging has more advantages than optical imaging and has been widely utilized in civilian and military applications [1]–[6]. The time-space independent reference radiation field is calculated with high resolution but no target information. High-resolution RCI requires the reference radiation field to be independent of time and space. This independence depends on the random signal waveform and the array geometry. Using RCI with a ULA in 3-D coordinates manifests an interesting phenomenon: when the ULA is not within the plane that the selected imaging area is located in, and the imaging area is symmetrical with respect to the projection line generated by the ULA alignment projecting in this plane, symmetrical images are formed in the imaging area To avoid this phenomenon, we propose using RCI in conjunction with a uniform circular array (UCA).
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