As a novel mode of ground-based synthetic aperture radar (GB-SAR), Arc frequency-modulated continuous wave (FMCW) SAR is rarely discussed in the literature up to now. Compared with conventional rail GB-SAR system, formed by rotation antennas, which can scan wide azimuth extent. Due its convenience and potential applications, Institute Electronics, Chinese Academy Sciences, carried out series FMCW experiments March 2013, lot results were obtained. In this paper, we discuss signal processing...

Interferometric synthetic aperture radar (InSAR) multichannel system, which produces more than one interferogram in a multifrequency or multibaseline configuration, allows us to reconstruct highly sloped and discontinuous terrain height profiles. In this letter, novel method based on closed-form robust Chinese remainder theorem (CRT) is presented solve the reconstruction problem. Proper reference selection differential process, do not exist traditional CRT, are adopted improve robustness of...

The next generation of spaceborne synthetic aperture radar (SAR) remote sensing systems will emphasize on high-resolution and wide-coverage imaging. For these design goals, digital beamforming (DBF) in elevation is a promising candidate. DBF-SAR can provide global monitoring capacity for the continuous observation highly dynamic rapidly changing world with high spatial resolution short repeat intervals. A experiment regarding real complex scene wave propagation channel effects remains...

This paper addresses some important aspects for the spaceborne/stationary bistatic synthetic aperture radar (SAR) (SS-BiSAR) imaging with transmitter, TerraSAR-X, operated in staring spotlight (ST) mode. With large integration time reaching 7.5 s and azimuth steering span ± 2.2°, several significant effects occur, including troposphere delay, precision phase synchronization, curved orbit effect, spectrum aliasing problem, efficient frequency domain focusing algorithm. To circumvent main...

Landslides, a major natural geohazard, obstruct municipal constructions and may destroy villages towns, at worst causing significant casualties economic losses. Interferometric Synthetic Aperture Radar (InSAR) technique offers distinct advantages on landslide detection monitoring. In this paper, more systematic workflow is designed for InSAR study of landslides, in terms three levels: (i) early regional scale, (ii) three-dimensional (3D) surface displacement rates estimation detailed (iii)...

As a crucial geological, climatic, and ecological boundary in the southeastern margin of Tibetan Plateau (SEMTP), topographic evolution Diancang Shan (DCS) remains unclear due to lack direct constraints on its paleoelevation. Here, we quantitatively reconstructed changes annual mean temperature (ANNT) based palynological data from terrestrial Dasongping section (∼ 7.6–1.8 Ma) Dali Basin, located at northeastern DCS Yunnan, China. Integrating thermochronological eastern...

The authors present a wavelet-based multigrid approach to solve the perturbation equation encountered in optical tomography. With this scheme, unknown image, data, as well weight matrix are all represented by wavelet expansions, thus yielding multiresolution representation of original domain. This transformed is then solved using which an increasing portion coefficients image successive approximations. One can also quickly identify regions interest (ROI's) from coarse level reconstruction...

星载合成孔径雷达(Synthetic Aperture Radar, SAR)作为一种主动式微波成像传感器,能够不受天气、气候以及光线的影响,可以全天时、全天候地成像,因此,星载合成孔径雷达已发展成为一种不可或缺的对地观测工具。随着技术的进步,未来星载SAR将实现高分辨率宽测绘带、低成本、小型化、多基多模式微波成像,并具有地面运动目标指示的能力,在最小的成本下获得最丰富的地物信息。这迫切需要星载SAR系统在新模式、新体制、新技术方面取得重大突破。该文将围绕星载合成孔径雷达技术发展现状及未来趋势展开论述。

Spaceborne Synthetic Aperture Radar (SAR), which can be mounted on space vehicles to collect information of the entire planet with all-day and all-weather imaging capacity, has been an indispensable device for earth observation. Currently, technology our spaceborne SAR achieved a considerable technological improvement, including resolution change from meter submeter, mode stripmap azimuth beam steering like sliding spotlight, practical application multichannel approach conversion single...

Interferometric synthetic aperture radar (InSAR) and tomographic SAR measurement techniques are commonly used for the three-dimensional (3D) reconstruction of complex areas, while effectiveness these methods relies on interferometric coherence among images with minimal angular disparities. Radargrammetry exploits stereo image matching to determine spatial coordinates corresponding points in two acquire their 3D properties. The performance process directly impacts quality resulting digital...

This letter presents a motion compensation solution for high-resolution automobile frequency-modulated continuous-wave (FMCW) synthetic aperture radar (SAR). The error model is proposed, and the characteristics of in FMCW SAR are analyzed by comparing with that airborne SAR. Furthermore, an effective approach presented, which can handle while keeping data well focused case high resolution. Finally, we validate formulated method using simulated as real were acquired Institute Electronics,...

This paper presents a double-channel hybrid bistatic synthetic aperture radar (SAR) system. It can be implemented with the available illuminator (e.g., spaceborne and airborne SAR systems) to acquire 2-D 3-D microwave images for remote-sensing applications. system used as test validation of complex acquisitions, novel synchronization algorithms, advanced imaging techniques. In this paper, we will demonstrate time phase strategies, fast time-domain algorithm, SAR, stereo radargrammetry in...

Time-series interferograms acquired on a deep pit with Ground-Based Synthetic Aperture Radar (GB-SAR) system showed that the atmospheric phase (AP) could be complexly space variant due to rapid changes of weather conditions and steep topography. Conventional compensation methods simulate AP typical parametrical models are no longer applicable. Based theoretical path integral model AP, grid partition (GP) method is proposed. By dividing one interferogram into certain number small grids,...

Interferometric inverse synthetic aperture radar (InISAR) can achieve 3-D imageries of maneuvering target. However, the quality suffers from noise and sidelobes seriously. In addition, defocusing effect due to nonlinear moving target also bring into a bad for imaging. To tackle these issues, InISAR imaging approach via compressed sensing (CS)-based super-resolution (SR) ISAR is proposed. First, we establish sparsity-constraint optimization model containing both amplitude phase information...

In order to enhance the target recognition probability in inverse synthetic aperture radar (ISAR) imaging domain, interferometric ISAR (InISAR) mode is presented achieve 3-D information of a target. However, real data results maneuvering are not enough, due difficult signal processing. this letter, combined processing approach proposed realize high-quality imagery approach, range alignment and phase adjustment implemented together on echoes avoid destroying coherence echoes. Then, InISAR can...

Based on the permanent scatterer (PS) technique, deformation measurements were taken in ground-based synthetic aperture radar (GB-SAR) applications. To realize long-term and real-time monitoring, a PS processing framework is proposed. Firstly, group selection introduced. A certain number of GB-SAR images are selected as different sets selected. Secondly, fluctuation factor defined to detect abnormal images. Some with amplitude information should not be used for analysis. Thirdly, an adaptive...

An experiment which involves the simultaneous deployment of three ground-based multiple-input multiple-output (GB-MIMO) radar systems to measure 3-D deformation a displaceable corner reflector (DCR) is outlined in this letter. The DCR successively displaces mutually orthogonal directions and each measures 1-D independently. Since displacement cannot be measured, they are estimated by solving nonlinear equation set based on rotation relationship between two coordinate systems, whose...

As polarimetric antennas can be isolated through excellent electronic frameworks in circular quad-polarization (CQP) synthetic aperture radar (SAR) systems, cross-polarization (x-pol) and co-polarization (co-pol) channel imbalances are more challenging essential to calibrate than crosstalk calibration (PolCAL). In uncalibrated CQP SAR images without corner reflectors (CRs), the reciprocity reflection symmetry assumptions of distributed targets commonly used estimate x-pol co-pol imbalances,...