Observations and mitigation of RFI in ALOS PALSAR SAR data: Implications for the DESDynI mission

Rosen, P. A.; Hensley, Scott; Le, Calvin

doi:10.1109/radar.2008.4720738

Cited by 33 publications

(20 citation statements)

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“…However, high-power RFI signals might be filtered during focusing step and they require proper RFI filters to be implemented [52][53][54]. Uncompensated RFI can increase the noise level in the phase signature of SAR images at L-band [55]. As said, however, the characterization of the RFI effects falls outside the limits of our investigation.…”

Section: Noise Signals Corrupting Sar Interferogramsmentioning

confidence: 92%

A Review of Interferometric Synthetic Aperture RADAR (InSAR) Multi-Track Approaches for the Retrieval of Earth’s Surface Displacements

2017

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Synthetic Aperture RADAR Interferometry (InSAR) provides a unique tool for the quantitative measurement of the Earth's surface deformations induced by a variety of natural (such as volcanic eruptions, landslides and earthquakes) and anthropogenic (e.g., ground-water extraction in highly-urbanized areas, deterioration of buildings and public facilities) processes. In this framework, use of InSAR technology makes it possible the long-term monitoring of surface deformations and the analysis of relevant geodynamic phenomena. This review paper provides readers with a general overview of the InSAR principles and the recent development of the advanced multi-track InSAR combination methodologies, which allow to discriminate the 3-D components of deformation processes and to follow their temporal evolution. The increasing availability of SAR data collected by complementary illumination angles and from different RADAR instruments, which operate in various bands of the microwave spectrum (X-, L-and C-band), makes the use of multi-track/multi-satellite InSAR techniques very promising for the characterization of deformation patterns. A few case studies will be presented, with a particular focus on the recently proposed multi-track InSAR method known as the Minimum Acceleration (MinA) combination approach. The presented results evidence the validity and the relevance of the investigated InSAR approaches for geospatial analyses.

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Section: Noise Signals Corrupting Sar Interferogramsmentioning

confidence: 92%

A Review of Interferometric Synthetic Aperture RADAR (InSAR) Multi-Track Approaches for the Retrieval of Earth’s Surface Displacements

2017

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“…Then estimate the deviation of the maximum value in the 2-D frequency domain by interpolation, as well as the estimated mismatch errors ∆τ and ∆t m . Both of them can be compensated in the frequency domain according to Equation (22), and G f (f r , f a ) can be defined as…”

Section: The Coherence Improving Algorithmmentioning

confidence: 99%

“…This compensation includes two steps. First, select one channel as a reference channel and calibrate the magnitude differences |G e (f r , f a )| in the frequency domain by (22). Here G f (f r , f a ) ∆ = |G e (f r , f a )| The magnitude differences can be expressed as follows:…”

Section: The Coherence Improving Algorithmmentioning

confidence: 99%

“…Few literatures have considered RFI suppression for the interferometric image, except the algorithm based on coherent estimation with subtraction of interfering signals adaptive filtering [22] and notch-filtering of the interferences with focused SAR images [18]. These suppression methods belong to the adaptive filtering methods, which are implemented in each channel respectively.…”

Section: Introductionmentioning

confidence: 99%

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Novel Pre-Processing Techniques for Coherence Improving in Along-Track Dual-Channel Low Frequency Sar

Fan¹,

Huang²,

Jin³

et al. 2012

PIER

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Abstract-The coherence between the complex image pair from two channels is important for improving the capability of alongtrack interferometry (ATI) processing in synthetic aperture radar (SAR) ground moving target indication (GMTI). The along-track dual-channel low frequency SAR can be easily influenced by not only mismatch errors of the image pair but also the radio frequency interference (RFI). RFI has great impacts on the joint probability density function (PDF) of magnitude and phase in the interferometric image. However, little work has been done to investigate the coherence improvement under RFI. This study develops an algorithm to improve the coherence of the image pair for along-track dual-channel low frequency SAR, which can be used by ATI. After analyzing RFI imaging in detail, it is proposed that the along-track interferometric image in the range frequency and cross-range slow time domain can be used to detect RFI. Median filters are proposed to further suppress RFI. This suppression has the same implementations to the image pair without heavy computation load. Considering RFI suppression and mismatch errors compensation, a pre-processing flow is proposed to achieve high coherence of the interferometric image in low frequency SAR. It is shown that the coherence of the complex image pair can be improved greatly by using this pre-processing flow. The effectiveness of this algorithm is demonstrated with real data acquired by an airborne along-track dual-channel P-band SAR GMTI system.

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“…그 예로 일본의 JERS-1 위 성에서 획득한 홋카이도의 쿠나시리 섬 영상은 간섭 신호에 의해 일부 지역에 밝은 선 형태의 왜곡을 보 인다 [5] . 이외에도, L-대역 airborne SAR 및 PALSAR 에서 수신한 영상에서 간섭 신호에 의해 왜곡이 발 생한 것을 볼 수 있으며, 이에 대한 대처 방안을 논 의하는 연구가 활발히 수행되고 있다 [6], [7] . …”

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An Analysis of Radio Frequency Interferences in L-Band SAR Images

Lee¹,

Lee

Lee³

2012

The Journal of Korean Institute of Electromagnetic Engineering

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SAR(Synthetic Aperture Radar) systems can provide images of wide coverage in day, night, and all-weather conditions. However wideband SAR systems are known to be vulnerable to interferences from other devices operating at in-band or adjacent spectrums and this may lead to image corruptions. In this paper, a SAR point target simulator is developed that provides performance analysis on image distortion caused by interferences from other devices. Interference signals are generated based on the experimental data observed from acquired SAR raw data. Simulation results include typical SAR performance measures such as spatial resolution, peak to sidelobe ratio and integrated sidelobe ratio. Finally, SAR target simulations are performed and shown to correspond to the image corruptions found in real SAR missions affected by RF interferences.

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Observations and mitigation of RFI in ALOS PALSAR SAR data: Implications for the DESDynI mission

Cited by 33 publications

References 1 publication

A Review of Interferometric Synthetic Aperture RADAR (InSAR) Multi-Track Approaches for the Retrieval of Earth’s Surface Displacements

A Review of Interferometric Synthetic Aperture RADAR (InSAR) Multi-Track Approaches for the Retrieval of Earth’s Surface Displacements

Novel Pre-Processing Techniques for Coherence Improving in Along-Track Dual-Channel Low Frequency Sar

An Analysis of Radio Frequency Interferences in L-Band SAR Images

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