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In this paper, the formation of high-resolution FMCW SAR video is introduced in detail. With the application of rational design and compact devices, a miniaturized FMCW SAR prototype is successfully realized. Based on this high-performance FMCW SAR system, the continuous real-time video is achieved after the preprocessing of raw data, the parallel realization of extended FSA and the reprocessing of...
Compared with the conventional broadside frequency modulation continuous wave synthetic aperture radar (FMCW SAR), the squint FMCW SAR has the characteristics of the high range walk, small range curvature and spatial-variant property weakening due to the presence of squint angle. Based on the characteristics of squint mode, an improved frequency scaling algorithm (FSA) is presented in this paper....
LBP operator shows good performance on rotation invariant while LGRPH is robust to multiplicative noise and gradient changes. In order to combine merits of both operators, an improved rotation invariant feature for SAR image is proposed in this paper. Experiments on SAR images demonstrate that the proposed feature has a good performance on targets recognition and image texture patches matching with...
The 3D and bistatic SAR parametric scattering models of canonical scatterers are approximated as the product of azimuthal and elevational 2D scattering models based on analyzing the scattering mechanisms of canonical scatterers in the 3D and bistatic case. After deriving relationship of the angles, the azimuthal and elevational 2D scattering models are substituted by the fundamental planar scattering...
Man-made buildings detection is important in land use supervision and land control applications. Generally, polarimetric synthetic aperture radar (PolSAR) data are processed to detect buildings well. But for some buildings which are not aligned with the radar track, these buildings are usually incorrectly recognized as forest, because the oriented buildings produce additional cross-polarization. Polarimetric...
The advantages of broad band and high efficiency make CBSA (cavity-backed slot antenna) a potential alternative for modern SAR (Synthetic Aperture Radar) systems. Therefore, a broadband CBSA is proposed for dual-polarization SAR system. By adopting double-layer wide slots and strip-lines feed, dual-polarization is achieved while still maintaining broad bandwidth. To enhance the antenna integration,...
In this paper, we propose a novel orthogonal frequency-division multiplexing (OFDM) waveform with low probability of intercept (LPI) and the corresponding synthetic aperture radar (SAR) processing algorithm. The OFDM waveform has a random spectrum for each pulse, making it a good candidate for low probability of intercept system implementation. The SAR processing algorithm eliminates the influence...
Downward looking sparse linear array three-dimensional synthetic aperture radar (DLSLA 3-D SAR) can obtain the 3-D image of the true scene, and compressive sensing (CS) provide the solution for cross-track super-resolution reconstruction. This paper concerns the issue of optimizing the measurement matrix, which affects the reconstruction performance. Two mutual coherence based criteria are proposed...
For sparse Radar signals, sparse imaging method is subversion of the traditional imaging method, which breaks through the limitations existing in traditional imaging method. In order to improve the imaging quality of Radar signals, we don't only realize the sparse radar imaging algorithm, but also propose a new method for choosing regularization parameter in 2D radar imaging. The imaging result verifies...
In recent years, with the advance of SAR technology, polarimetric SAR has been used to observe oceanic phenomenon. Full-polarized SAR could collect not only the intensity of echoes backscattered from targets, but also the phase information between different polarimetric channels. Polarimetric features, which are usually extracted from SAR images, are related with the physical and geometrical properties...
Slope radar which is based on the principles of synthetic aperture radar and differential interferometry can be used to the deformation monitoring in open pit mines, tailings, dump and other occasions. The existing slope radar systems mainly adopt stepping frequency continuous wave signal (SFCW) to achieve range resolution, and achieve azimuth resolution by stop-go motion mode along track direction...
Recently ground-based synthetic aperture radar (GB-SAR) has been an important technical means in remote sensing deformation monitoring. However, similar to spaceborne and airborne SAR, the accuracy of GB-SAR interferometry is also seriously affected by atmospheric phase disturbances. In this paper, a novel GB-SAR atmospheric phase correction (APC) algorithm based on coherent scatterers (CSs) is proposed...
Recognizing targets in synthetic aperture radar (SAR) images is an important, yet challenging problem in SAR image interpretation. Scattering center provides a concise and physically relevant description of the target's electromagnetic scattering phenomenon which makes it an ideal candidate for ATR. In this paper, scattering centers from template and measured data are used for ATR. The two scatter...
This paper presents an approach for synthetic aperture radar (SAR) scattering center detection based on electromagnetic model (EM-model) by hypothesis testing (HT). The scattering center extraction is a critical step in model-based SAR automatic target recognition. In traditional methods, the extraction of scattering centers merely make use of the measured SAR image and lack for the prior information...
This paper presents a position correcting method concerning the existing problem in the forward approach to establish component-level parametric scattering center models for known complex radar targets. The forward approach decomposes the target-model of radar into some parts and then extracts the scattering centers and their parameters through radar simulation. In the actual utilization of the forward...
Quick response to a large-scale natural disaster such as earthquake and tsunami is vital to mitigate the further loss. Remote sensing especially the spaceborne sensors provide the solution to monitor a huge area in a short time and with regular revisit circle. Damage ranges and damage levels of the destructed urban areas are extremely important information for rescue planning after an event. Rapid...
Hazards due to ground movements and instability in man-made structures can lead to considerable human and economic losses. The decrease of permafrost areas, changes in precipitation patterns and increase of extreme weather which due to the recent climate change is actually influencing the weather-related mass movement activities. In Malaysia, landslide is the most commonly seen land deformation issue...
A seeker in an air-to-ground guidance missile aimed to hit a main battle tank (MBT) should scan front ground of the missile and estimate the target position to guide. In this paper, we generate the radar image to estimate the target position via Synthetic Aperture Radar (SAR) based on FMCW. By SAR, targets are also resolved in azimuth direction. We analyze FMCW signal in fast-time and slow-time separately...
X-SAR system is the airborne imaging radar with multi-mode synthetic aperture radar (SAR) at high-resolution, interferometer and full-polarization, which has been developed by the Institute of Remote Sensing and Digital Earth (RADI), Chinese Academy of Sciences (CAS), funded by the CAS Large Research Infrastructures. The first-stage form 2009 to 2015, X-SAR was successfully implemented to an operational...
In circular synthetic aperture radar (CSAR), targets are usually scanned over the complete azimuthal aperture of 360°. Thus CSAR can provide a higher image resolution, increased object information and 3-D imaging in comparison to the linear SAR system. This paper presents a low frequency ultra-wideband CSAR experiment and results. The CSAR system, operating in the P band, is based on a P band UWB...
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