Ultra-high resolution airborne SAR imaging of vegetation and man-made objects based on 40% relative bandwidth in X-band

Brenner, Andreas

doi:10.1109/igarss.2012.6351920

Cited by 10 publications

(5 citation statements)

References 6 publications

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“…The PAMIR system is an airborne experimental platform designed by the Institute for High Frequency Physics and Radar Techniques (FHR), and functions in VHR imaging, multi-channel imaging, multipolarization imaging, 3-D imaging, and ground moving target indication [14]. In 2010, the signal bandwidth of the upgraded PAMIR system was increased to 3.6 GHz [26], with a range resolution of 0.05 m and an azimuth resolution of 0.02 m. Hence, it has the highest resolution among the publicly reported SAR systems. The development of China's VHR SAR system started late.…”

Section: Technical Analysismentioning

confidence: 99%

Very High Resolution Synthetic Aperture Radar Systems and Imaging: A Review

Chen,

Dong,

Zhang

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Given its capacity to generate 2-D fine images of observation areas, very high-resolution (VHR) synthetic aperture radar (SAR) has become increasingly popular in myriad fields, including remote sensing, geoscience, and surveillance. In this article, we present a comprehensive overview of VHR SAR systems and imaging to highlight the related research and promote further development. First, we provide a summary of VHR SAR applications and summarize the typical airborne and spaceborne systems. Subsequently, a detailed overview is provided to demonstrate the range VHR technologies by introducing dechirp processing, stepped-frequency, and microwave photonic. Additionally, VHR imaging methods on different platforms, i.e., ideal trajectory, airborne, and spaceborne, are reviewed. Finally, the challenges and prospects of VHR SAR are presented to inform future research directions. This work provides a valuable resource to improve the system design and signal processing of VHR SAR.

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Section: Technical Analysismentioning

confidence: 99%

Very High Resolution Synthetic Aperture Radar Systems and Imaging: A Review

Chen,

Dong,

Zhang

et al. 2024

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…X-band has been widely used for SAR imaging of static or moving targets. Wideband and ultra-wideband SAR systems were used to achieve fine spatial resolution, with bandwidth of 400 MHz in TELAER [31], 800 MHz in F-SAR [33], and 3.6 GHz in an upgraded PAMIR (in 2012) [25], [30]. In this work, the center frequency is set to f 0 = 10 GHz and the bandwidth is set to B r = 1.25 GHz to achieve range resolution of 12 cm.…”

Section: A Default Parametersmentioning

confidence: 99%

“…In this work, the center frequency is set to f 0 = 10 GHz and the bandwidth is set to B r = 1.25 GHz to achieve range resolution of 12 cm. Referring to the PAMIR SAR, with maximum range of 100 km [25], the slant range is set to R 0 = 30 km in this work. The pulse width is set to T r = 2.5µs, compatible to 15µs in PAMIR SAR [30], leading to a range chirp rate of K r = 500 THz/s.…”

Section: A Default Parametersmentioning

confidence: 99%

Imaging and Motion Parameter Estimation of Flying Helicopter With Duo Airborne SARs in $X$-Band

Kiang

2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Duo airborne synthetic aperture radars (SARs) in X band are proposed to acquire images of a flying helicopter. The backscattered signals manifest entangled features attributed to the compound linear motion of fuselage and spin motion of rotors. A two-stage template matching method is proposed to meticulously untangle signals from moving fuselage, spinning main rotors and tail rotor. The velocity vector of fuselage and the spinning rate of main rotors can be accurately estimated, and the spinning rate of tail rotor can be estimated after removing the strong signals from fuselage and main rotors. The acquired images in different scenarios are evaluated and verified with three state-of-the-art algorithms.

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“…Another multi-target simulation is further conducted based on the real airborne SAR images of three vehicles with about 0.02 m resolution as shown in Figure 12 a [ 24 ]. Figure 12 b provides an emulated SAR image focused by a range migration algorithm.…”

Section: Simulationsmentioning

confidence: 99%

A Novel Azimuth Super-Resolution Method by Synthesizing Azimuth Bandwidth of Multiple Tracks of Airborne Stripmap SAR Data

Wang

Sun

et al. 2016

Sensors

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Azimuth resolution of airborne stripmap synthetic aperture radar (SAR) is restricted by the azimuth antenna size. Conventionally, a higher azimuth resolution should be achieved by employing alternate modes that steer the beam in azimuth to enlarge the synthetic antenna aperture. However, if a data set of a certain region, consisting of multiple tracks of airborne stripmap SAR data, is available, the azimuth resolution of specific small region of interest (ROI) can be conveniently improved by a novel azimuth super-resolution method as introduced by this paper. The proposed azimuth super-resolution method synthesize the azimuth bandwidth of the data selected from multiple discontinuous tracks and contributes to a magnifier-like function with which the ROI can be further zoomed in with a higher azimuth resolution than that of the original stripmap images. Detailed derivation of the azimuth super-resolution method, including the steps of two-dimensional dechirping, residual video phase (RVP) removal, data stitching and data correction, is provided. The restrictions of the proposed method are also discussed. Lastly, the presented approach is evaluated via both the single- and multi-target computer simulations.

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Ultra-high resolution airborne SAR imaging of vegetation and man-made objects based on 40% relative bandwidth in X-band

Cited by 10 publications

References 6 publications

Very High Resolution Synthetic Aperture Radar Systems and Imaging: A Review

Very High Resolution Synthetic Aperture Radar Systems and Imaging: A Review

Imaging and Motion Parameter Estimation of Flying Helicopter With Duo Airborne SARs in $X$-Band

A Novel Azimuth Super-Resolution Method by Synthesizing Azimuth Bandwidth of Multiple Tracks of Airborne Stripmap SAR Data

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