Abstract
Three-dimensional (3D) ground-based synthetic aperture radar (GB-SAR) draws attention because of the ability to obtain high accuracy 3D information of the monitoring terrain. Besides, the 3D GB-SAR system is welcome due to the flexibility and large coverage in angle and range. However, existing 3D imaging algorithms for GB-SAR data focusing have limits of high computational complexity or narrow applicable scope. To realize 3D displacement monitoring with high spatial resolution and short revisit time, in this paper, a novel 3D imaging algorithm is proposed. Based on characteristics of the model of echo data from the large range and wide-view angle scenario, the proposed method uses keystone formatting to complete range migration correction and subblocks dechirping to realize horizontal focus. With the method, the reflectivity of the monitoring scenario is obtained by only one time of linear interpolation and several times of fast Fourier transforms. The main advantages of this algorithm are high imaging precision and low computational cost, and in addition, it is applicable for large illuminating coverage including the near-field and the far-field of the radar aperture. The imaging results are sampled on pseudo-spherical grid, aiming to simplify the formulation. Finally, this method is extensively validated with simulations.
Highlights
Ground-based synthetic aperture radar (GB-Synthetic aperture radar (SAR)), a newly rising synthetic aperture radar technology, can realize large-area, all-weather and all-time monitoring with high accuracy and short revisit time
This paper proposes an efficient and accurate 3D imaging algorithm, that is Three Dimensional Keystone formatting and Subblock Dechirping (3D-KSD) algorithm
It can be widely used for 3D Ground-based synthetic aperture radar (GB-SAR) imaging systems and most of 3D radar imaging systems with similar configurations and radar parameters
Summary
Ground-based synthetic aperture radar (GB-SAR), a newly rising synthetic aperture radar technology, can realize large-area, all-weather and all-time monitoring with high accuracy and short revisit time. Reference [14] has proposed a far-field pseudopolar format algorithm (FPFA) It only retains one-term in the range history of targets. THE BASIS OF THE THREE-DIMENSIONAL GROUND-BASED SAR SYSTEM The 3D GB-SAR system achieves cross-range resolutions in azimuth and height directions by a 2D synthetic aperture. The main characteristics of the 3D GB-SAR system as shown in FIGURE 1 are summarized as follows: 1) Short aperture lengths in azimuth and height directions (1-4m): angle resolutions (-3dB beam width) are constant and space resolutions in cross-range directions (δa and δh) are increasing linearly with the increase of the range, as shown in (8). The simplified signal model demonstrates that the range migration of the echo signal is linear and the phase history is parabolic both in azimuth and height directions.
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