Abstract
Arc-array synthetic aperture radar (AA-SAR) has become a novel imaging scheme for full azimuth observation. However, the exiting arc-array monostatic SAR system is placed on a single platform and is easy to detect. Arc-array bistatic SAR (AA-BiSAR) with a stationary transmitter is proposed in this paper, which can obtain high data acquisition efficiency and reduce vulnerability of arc-array monostatic SAR. Furthermore, since the azimuth resolution with full azimuth observation is not related to the location of the stationary transmitter, the transmitter can be placed far away from the receiver. Compared with imaging algorithms for other modes, the key points of AA-BiSAR imaging algorithms are a square root in the bistatic slant range equation and an arc synthetic array in azimuth. According to the imaging geometry of AA-BiSAR, a novel imaging approach for AA-BiSAR based on keystone transform (KT) is proposed, and the KT implements range-cell migration correction (RCMC) in conditions of trigonometric function under square root in the range history and arc synthetic array in azimuth via reformatting the AA-BiSAR raw data. Besides presenting the proposed imaging approach, a complete resolution analysis of AA-BiSAR is given. Results of numerical simulation experiments on point targets validate the proposed imaging approach.
Highlights
A synthetic aperture radar (SAR) has all-weather, all-day, high-resolution and multi-dimensional imaging capabilities [1–7]
In AA-Bistatic SAR (BiSAR), high-range resolution can be achieved by the high-power wide-bandwidth linear frequency modulation (LFM) signal transmitted by the stationary transmitter far away from the passive receiver, while in the azimuth direction, multiple antenna array elements are arranged along a cylinder to form an arc-synthetic aperture, the switched array antenna channels scan quickly over circular aperture
In order to obtain full azimuth imaging quickly and counter the vulnerability of the conventional monostatic SAR, a novel BiSAR with a passive arc antenna and a stationary transmitter named as AA-BiSAR was proposed in this paper
Summary
A synthetic aperture radar (SAR) has all-weather, all-day, high-resolution and multi-dimensional imaging capabilities [1–7]. In AA-BiSAR, high-range resolution can be achieved by the high-power wide-bandwidth linear frequency modulation (LFM) signal transmitted by the stationary transmitter far away from the passive receiver, while in the azimuth direction, multiple antenna array elements are arranged along a cylinder to form an arc-synthetic aperture, the switched array antenna channels scan quickly over circular aperture. LA-SAR systems, the electronic scanning mode of the passive arc-array antenna in AA-BiSAR has significant advantages such as instantaneous data acquisition, large-angle view imaging, and azimuth effective azimuth direction observation area of the system is determined by the size of θ s and θ a. As we can see from the figure of instantaneous slant range distance between Pr and Pn is given as dr , dt is referred to the instantaneous the imaging geometry, O ' is the center of the passive arc-array antenna,is the origin of coordinate.
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