Development of a Truck-Mounted Arc-Scanning Synthetic Aperture Radar

Lee, Hoonyol; Lee, Jaehee; Kim, Kwang-Eun; Sung, Nak-Hoon; Cho, Seong‐Jun

doi:10.1109/tgrs.2013.2265700

Cited by 63 publications

(41 citation statements)

References 17 publications

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“…The azimuthal phase variation arises from the rotational acquisition: the antennas are mounted with an offset L arm from their center of rotation, as shown in Figure 1. Therefore, during the rotation the distance from the phase center to a scatterer varies with the azimuth position, changing the propagation phase accordingly [56]. If the variation in distance is larger than the range resolution, the target will move though several range cells as a function of azimuth position, in analogy to range cell migration in SAR systems.…”

Section: Azimuth Processingmentioning

confidence: 99%

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

Baffelli

Frey

Werner

et al. 2018

IEEE Trans. Geosci. Remote Sensing

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Abstract-Differential interferometry using groundbased radar systems permits to monitor displacements in natural terrain with high flexibility in location, time of acquisition and revisit time. In combination with polarimetric imaging, discrimination of different scattering mechanisms present in a resolution cell can be obtained simultaneously with the estimation of surface displacement. In this paper we present the pre-processing steps and the calibration procedure required to produce high-quality calibrated polarimetric single-look complex imagery with KAPRI, a new portable Ku-band polarimetric radar interferometer. The processing of KAPRI data into SLC images is addressed, including the correction of beam squint and of azimuthal phase variations. A polarimetric calibration model adapted to the acquisition mode is presented and used to produce calibrated polarimetric covariance matrix data. The methods are validated by means of a scene containing five trihedral corner reflectors. Data pre-processing is assessed by analyzing the oversampled response of a corner reflector and the polarimetric calibration quality is verified by computing polarimetric signatures and residual calibration parameters.

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Section: Azimuth Processingmentioning

confidence: 99%

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

Baffelli

Frey

Werner

et al. 2018

IEEE Trans. Geosci. Remote Sensing

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“…Moreover, according to the geometric configuration, it can be easily spotted that the azimuth resolution of the helicopter-borne FMCW-ROSAR depends on the azimuth reconstructed angle [6], [7]. Therefore, in order to obtain the high azimuth resolution, the fourth order of the power series expansion of the slant range (5) is utilized, and it can be derived as…”

Section: B Two-dimensional Spectrum For Fmcw-rosarmentioning

confidence: 99%

“…Moreover, the hardware complexity and high cost make the array forwardlooking SAR not quite suitable for practical implementations. The rotating SAR (ROSAR) is an important imaging mode based on the rotating antenna [5], [6], whose radar antenna is mounted on the tip of the helicopter rotor blade or rigid bracket, which further simplifies the configuration compared with the array forward-looking SAR. With the rotation of the antenna, the full 360 • imaging area can be obtained without the necessity of generally required movement of the helicopter platform.…”

Section: Introductionmentioning

confidence: 99%

“…Several imaging algorithms were proposed for ROSAR, e.g., timedomain method [5], but it suffers great computation burden. The subsequently proposed subaperture imaging method also suffers from low-resolution shortcomings [6], [7]. To explore the advantages of the helicopter-borne ROSAR combining with the FMCW technology, a new imaging configuration and an efficient imaging algorithm still need further investigations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Helicopter-Borne Rotating SAR Imaging Model and Algorithm Based on Inverse Chirp-Z Transform Using Frequency-Modulated Continuous Wave

Dong

Liu

Yong

et al. 2015

IEEE Geosci. Remote Sensing Lett.

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With an appropriate geometric configuration, a helicopter-borne rotating synthetic aperture radar (ROSAR) can break through the limitations of conventional strip-map monostatic SAR on forward-looking imaging. Owing to such a capability, ROSAR has extensive potential applications, such as selfnavigation and self-landing. Moreover, it has many advantages if combined with frequency-modulated continuous wave (FMCW) technology. In this letter, a novel geometric platform configuration and an imaging algorithm for helicopter-borne FMCW-ROSAR are proposed. First, by adopting the higher order approximation of slant range model to improve the azimuth resolution for FM-CW-ROSAR, the precise 2-D spectrum of the echo signal is derived based on series reversion. Moreover, at the same time, the Doppler offset caused by the continuous motion of the antenna is analyzed and compensated as well. Then, according to the analysis on the range-dependent velocity variation caused by ROSAR geometric configuration, an efficient inverse chirp-Z transform is utilized to remove the variant range cell migration, and a well-focused SAR image can thus be obtained. Finally, the experimental results with simulated data demonstrate the effectiveness of the proposed algorithm. IndexTerms-Frequency-modulated continuous wave (FMCW), helicopter-borne rotating synthetic aperture radar (ROSAR), inverse chirp-Z transform (ICZT), series reversion method.

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“…The traditional linear array SAR (LA-SAR) [8][9][10][11] can only observe the front area of the antenna array unit from a single angle of view. Compared with LA-SAR, arc-array SAR (AA-SAR) [12][13][14][15][16][17][18][19][20][21] is a novel array microwave imaging mode with full azimuth observation, which breaks through the limitation of the single observation angle of conventional LA-SAR. Furthermore, AA-SAR can realize quickly high-resolution imaging in area around the imaging platform.…”

Section: Introductionmentioning

confidence: 99%

Focusing Arc-Array Bistatic Synthetic Aperture Radar Data Based on Keystone Transform

Huang

et al. 2019

Electronics

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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.

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Development of a Truck-Mounted Arc-Scanning Synthetic Aperture Radar

Cited by 63 publications

References 17 publications

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

Polarimetric Calibration of the Ku-Band Advanced Polarimetric Radar Interferometer

A Novel Helicopter-Borne Rotating SAR Imaging Model and Algorithm Based on Inverse Chirp-Z Transform Using Frequency-Modulated Continuous Wave

Focusing Arc-Array Bistatic Synthetic Aperture Radar Data Based on Keystone Transform

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