Adaptive two-step calibration for high-resolution and wide-swath SAR imaging

Zhang, L.; Xing, Mengdao; Qiu, Cheng‐Wei; Bao, Zheng

doi:10.1049/iet-rsn.2008.0158

Cited by 59 publications

(36 citation statements)

References 13 publications

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“…The phase mismatch is estimated using the orthogonal subspace method (OSM), which has been evaluated via simulation (Zhang et al, 2010) and applied to airborne multichannel SAR systems (Zhang et al, 2015) without spaceborne application. Jin et al (2016) has shown that the OSM is an effective estimator for all scenes, with no deterioration for heterogeneous areas.…”

Section: Estimation Of Channel Imbalancesmentioning

confidence: 99%

“…They applied correlation method to estimate the channel mismatches in DBF, with a little deficiency of not considering other estimation algorithms. The orthogonal subspace method (OSM) for error estimation was introduced by Zhang et al (2010) and Zhang et al (2015). Yang et al (2013) and Jin et al (2016) compared the OSM algorithm other methods and verified to be effective with simulated and airborne real data.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Error Estimation and Unambiguous Reconstruction for Chinese First Dual-Channel Spaceborne Sar Imaging

Jin

Qiu

et al. 2017

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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Commission I, WG I/3KEY WORDS: Synthetic aperture radar (SAR), high-resolution and wide-swath (HRWS), digital beamforming (DBF), orthogonal subspace method (OSM), unambiguous reconstruction. ABSTRACT:Multichannel synthetic aperture radar (SAR) is a significant breakthrough to the inherent limitation between high-resolution and wide-swath (HRWS) faced with conventional SAR. Error estimation and unambiguous reconstruction are two crucial techniques for obtaining high-quality imagery. This paper demonstrates the experimental results of the two techniques for Chinese first dualchannel spaceborne SAR imaging. The model of Chinese Gaofen-3 dual-channel mode is established and the mechanism of channel mismatches is first discussed. Particularly, we propose a digital beamforming (DBF) process composed of the subspace-based error estimation algorithm and the reconstruction algorithm before imaging. The results exhibit the effective suppression of azimuth ambiguities with the proposed DBF process, and indicate the feasibility of this technique for future HRWS SAR systems.

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Section: Estimation Of Channel Imbalancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Error Estimation and Unambiguous Reconstruction for Chinese First Dual-Channel Spaceborne Sar Imaging

Jin

Qiu

et al. 2017

ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.

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show abstract

“…The proposed algorithm is based on the analysis of signal subspace and noise subspace. This subspace method has been employed in numerous application [5], [6]. Herein, we extend it to HRWS GMTI to estimate the velocity of moving target.…”

Section: Introductionmentioning

confidence: 99%

A velocity estimation method of moving target for SAR high-resoluton wide-swath mode

Wang

et al. 2016

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

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This manuscript focuses on velocity estimation for synthetic aperture radar (SAR) in high-resolution wide-swath mode. HRWS mode is proposed to overcome the system-inherent limitation, which allows for collecting additional samples under relatively low PRF. Unlike the previous work of SAR ground moving target indication (GMTI) in single channel and multiple channels, the velocity estimation in HRWS GMTI would face two inherent unavoidable problems: the under-sampled data in single channel and non-uniform samples in azimuth. The proposed method is effective, accurate and efficient under these two problems. Some relevant simulations are shown to validate the proposed scheme.

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“…The available correction methods can be classified as two categories: methods on internal calibration [14] and methods on raw data [15,16]. However, all these correction methods only either handled the inner-band imbalance in the DPCA system with single subband [15,16] or concerned the multiple subbands system with single subaperture [14]. In [14], Deng et al gave the internal calibration approach, where the imbalance information is obtained from the internal calibration data acquired from the calibration subsystem.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it cannot correct imbalance introduced by the antennas. The subspace projection method proposed in [16] and the azimuth cross-correlation method presented in [15] do not require additional subsystem. However, they cannot correct the interband imbalance, as the phase difference caused by different carrier frequencies is range dependent and hard to compensate.…”

Section: Introductionmentioning

confidence: 99%

Correction of Channel Imbalance for MIMO SAR Using Stepped-Frequency Chirps

Luo

Deng

Murphy

et al. 2014

International Journal of Antennas and Propagation

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To simultaneously achieve two-dimensional high resolution and wide swath in synthetic aperture radar (SAR), azimuth MIMO structure combined with stepped-frequency chirp signals was developed via splitting the antenna into subapertures. During transmitting each subaperture transmits a chirp pulse at a different carrier frequency, while during receiving every subaperture receives the scattered pulses at the same time. Separating the scattered pulses received by each subaperture and downlinking them to the ground yield 2 different signal paths. Due to the dedicated network in the SAR system, the channel imbalance is inevitable. To correct the channel imbalance, this paper presents an external calibration method, where the channel characteristics are estimated from the peak value of a strong point target for each channel. Simulation and real raw data experiments are performed to validate the proposed method.

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Adaptive two-step calibration for high-resolution and wide-swath SAR imaging

Cited by 59 publications

References 13 publications

Error Estimation and Unambiguous Reconstruction for Chinese First Dual-Channel Spaceborne Sar Imaging

Error Estimation and Unambiguous Reconstruction for Chinese First Dual-Channel Spaceborne Sar Imaging

A velocity estimation method of moving target for SAR high-resoluton wide-swath mode

Correction of Channel Imbalance for MIMO SAR Using Stepped-Frequency Chirps

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