Inflight Antenna Pattern Measurement for Bistatic Synthetic Aperture Radar Systems

Wang, Wen-Qin

doi:10.1109/lawp.2007.905013

Cited by 6 publications

(3 citation statements)

References 11 publications

(13 reference statements)

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“…For bistatic SAR, the measurement of the range round trip antenna pattern is significantly more complex, and a few specific measurement methods have been given in the published studies. Moreover, a technique that uses the transponder is applicable for measuring the antenna patterns of bistatic SAR [8]. However, the design of active calibration targets does not consider the range variation of the bistatic angle in the swath, which may lead to incorrect measurement results.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Comodulation Effect Induced by Transmitting and Receiving Antennas and Correction Method in Bistatic SAR Radiometric Calibration

Zheng

Wang

Hong

et al. 2022

IEEE Geosci. Remote Sensing Lett.

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In the bistatic synthetic aperture radar (SAR), the comodulation effect induced by transmitting and receiving antennas to the image amplitude is the main factor affecting the radiometric accuracy. Therefore, the corresponding mechanism must be determined, and a correction method must be developed. However, there is no effective calibration target and method for measuring the bistatic SAR range round trip antenna pattern. In this letter, it is pointed out that the comodulation effect is not only related to the transmitting and receiving one-way antenna patterns but also to the range variation of the bistatic angle in the swath caused by the bistatic SAR observation geometry. To increase the radiometric accuracy in bistatic SAR images, a comodulation effect correction method based on accurate antenna models is proposed, and different error factors related to the range round trip antenna pattern are analyzed. Moreover, simulation experiments are conducted to verify the effectiveness of the proposed method.

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Section: Introductionmentioning

confidence: 99%

Analysis of Comodulation Effect Induced by Transmitting and Receiving Antennas and Correction Method in Bistatic SAR Radiometric Calibration

Zheng

Wang

Hong

et al. 2022

IEEE Geosci. Remote Sensing Lett.

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“…Since frequency reconfigurable antennas allow frequency hopping and dynamically allocating spectrum, while radiation pattern and polarization reconfiguration can filter the in-band interference to increase the channel capacity, we think the compound reconfigurable antenna can be the right choice to address the drawbacks mentioned above existing in current reconfigurable phased array antennas. en, the key problem becomes how to design reconfigurable antennas with individually tuning frequency, radiation pattern, and polarization [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Novel Linear Sparse Array with Reconfigurable Pixel Antenna Elements

Wei²,

Zhao

et al. 2020

International Journal of Antennas and Propagation

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In this paper, on the basis of multifunctional reconfigurable pixel antenna (RPA) elements, a novel linear sparse array with an attractive compound reconfigurability is presented. It has the potential advantages of its beam scanning with low gain fluctuation, low sidelobe in two orthogonal planes, and polarization reconfigurable performance. Specifically, an RPA with simultaneous polarization and pattern reconstruction capabilities, consisting of the driven patch and the parasitic pixels on the same layer of dielectric substrate, is firstly designed, which can work in several operation modes corresponding to steerable beam directions (θ � 0°; θxoz � 25°, 45°; θyoz � 15°) with two circular polarizations in X-band. Cross-slot coupling feed is used to improve polarization reconstruction capability and reduce the complexity of hybrid reconstruction topology optimization. en, those RPAs are integrated into the 1 × 8 linear sparse array to realize the reconfiguration of two circular polarizations and beam steering in xoz-and yoz-plane. Simulation results show that the gain fluctuation and sidelobe level of the array during beam scanning have significant advantages over the previous phased array, and the generation of antenna grating lobes is avoided. Moreover, both RPA element and RPA array prototypes have been fabricated and measured to testify the efficiency. e measured results agree well with the simulated ones, which indicates the application potential in the field of modern wireless communication system of the proposed linear sparse array.

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“…At present, several bistatic calibration methods based on point targets have been proposed, which can be roughly divided into two categories. One idea is to use an active calibration target with a high radar cross-section (RCS) over a large frequency range that can be easily configured for different bistatic angles [7][8][9]; however, active calibration targets are expensive and complex to manufacture. The other view is to utilize passive calibration targets.…”

Section: Introductionmentioning

confidence: 99%

Feasibility, Design, and Deployment Requirements of TCR for Bistatic SAR Radiometric Calibration

et al. 2018

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The trihedral corner reflector (TCR) is widely used as the calibration device in monostatic synthetic aperture radar (SAR) calibration, and the performance of the TCR in radiometric calibration has been studied and verified in depth. As for the bistatic SAR system calibration problem, there have been few published studies. There is a lack of knowledge regarding the exact bistatic radar cross-section (RCS) pattern of TCR with different bistatic angles, and it is also not clear whether the TCR can be used as the calibration target in bistatic SAR. Moreover, the bistatic and monostatic radar cross-section (RCS) characteristics of the TCR are different, even if the bistatic angle is very small. Therefore, the feasibility, design, and deployment requirements of the TCR for bistatic SAR calibration should be carefully investigated. In this paper, we outline the theoretical and practical requirements that need to be satisfied when choosing appropriate calibration devices for bistatic radiometric calibration. Based on these requirements, we analyzed the bistatic RCS patterns using electromagnetic simulation, and concluded that the TCR is feasible for bistatic SAR calibration under relatively small bistatic angles (less than 6°). The change of TCR boresight with the bistatic angle is not considered generally. However, we found that the TCR boresight and peak RCS will change with the bistatic angle. We have also proposed that the bistatic angle can be extended to 20° by taking the change of the TCR boresight into account. In this condition, we should get the TCR boresight according to the bistatic angle and then align it during the deployment. Both of these two conditions have their own unique advantages. Different error sources of TCR RCS from manufacture, misalignment, and deformation were investigated quantitatively with simulations, which can provide a theoretical basis for how to design a suitable TCR and guarantee the calibration accuracy for bistatic calibration. In addition, simulation results are different from those of monostatic calibration. Through experiments, we have further verified the feasibility by comparing the quality of bistatic SAR images and point target energy with several typical bistatic angles as the TCR boresight is considered or not. If the bistatic angle is larger than 6°, taking the TCR optimum boresight into account can improve imaging quality and point target energy.

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Inflight Antenna Pattern Measurement for Bistatic Synthetic Aperture Radar Systems

Cited by 6 publications

References 11 publications

Analysis of Comodulation Effect Induced by Transmitting and Receiving Antennas and Correction Method in Bistatic SAR Radiometric Calibration

Analysis of Comodulation Effect Induced by Transmitting and Receiving Antennas and Correction Method in Bistatic SAR Radiometric Calibration

A Novel Linear Sparse Array with Reconfigurable Pixel Antenna Elements

Feasibility, Design, and Deployment Requirements of TCR for Bistatic SAR Radiometric Calibration

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