Abstract
Due to advantages such as its low power consumption and higher concealment, deceptive jamming against synthetic aperture radar (SAR) has received extensive attention during the past decades. However, large-scene deception jamming is still a challenge because of the huge computing burden. In this paper, we propose a new large-scene deceptive jamming algorithm. First, the time-delay and frequency-shift (TDFS) algorithm is introduced to improve the jamming processing speed. The system function of jammer (JSF) for a fake scatter is simplified to the multiplication of the scattering coefficient, a time-delay term in the range dimension and a frequency-shift term in the azimuth dimension. Then, in order to solve the problem that the effective region of the TDFS algorithm is limited, the scene deceptive jamming template is divided into several blocks according to the SAR parameters and imaging quality control factor. The JSF of each block is calculated by the TDFS algorithm and added together to achieve the large-scene jamming. Finally, the correction algorithm in squint mode is derived. The simplification and parallel-block processing could improve the calculation efficiency significantly. The simulation results verified the validity of the algorithm.
Highlights
Synthetic aperture radar (SAR) is an effective system that uses electromagnetic waves for high-resolution imaging
The first step in the preprocessing stage is template segmentation: according to the parameters jammer R and the given factors ε and η, we divide the template into several blocks based on the including synthetic aperture length L, signal bandwidth B, shortest slant range of the jammer RJ0 and the limitation of Equation (28); we perform offline calculation and calculate the time-delay matrixes given factors ε and η, we divide the template into several blocks based on the limitation of Equation (28); Hr and Hr according to Equations (38) and (39)
According to the analysis of the time-delay and frequency-shift (TDFS)-template segmentation (TS) algorithm in Sections 2.2.2 and 2.2.4, the simplification in the range dimension leads to a distortion of the azimuth profile including the main lobe broadening and position offset, and the residual range cell migration (RCM) introduced by the simplification in the azimuth dimension affects both the range and the azimuth profile
Summary
Space-Borne SAR Based on Time-Delay and Frequency-Shift with Template Segmentation. Logistics Science and Technology Institute, Institute of Systems Engineering, Academy of Military Science, Beijing 100071, China. Received: 2 December 2019; Accepted: December 2019; Published: December 2019
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