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This paper presents a novel multiple input single output ISAR (MISO-ISAR) imaging configuration for moving airborne target, which employs multiple transmitters and a single ground-based stationary receiver. By properly fusing the information provided by these transmitters from different view angles, both the range and cross range resolutions can be improved compared to bistatic ISAR (B-ISAR). Moreover,...
This paper proposes an Extended Inverse Chirp-Z Transform (EICZT) algorithm to handle the high squint FMCW SAR data, where the conventional Inverse Chirp-Z Transform (ICZT) cannot work due to the failure in dealing with the range-variance of second- and higher- order range-azimuth coupling terms. A pre-processing operation is implemented in the azimuth-Doppler and range-time (Doppler-time) domain,...
A land use and land cover (LULC) map is primitive information in many application fields as the geospatial information, and this is able to be contributed by the Earth observation satellite data in both local scale and global scale. Recently, much finer resolution (∼10m spatial resolution) of LULC map is demanded from users to contribute in the application fields i.e. agriculture, forest management,...
The volcanic monitoring by synthetic aperture radar (SAR) is useful because of the independence of smoke and the weather. The airborne SAR developed by NICT (Pi-SAR2) has excellent character of high resolution, fully polarimetry and interferometric function. Pi-SAR2 is more effective to monitor a volcano. In this paper we describe the monitoring of the active volcano, Mt. Shinmoe in Japan. Mt. Shinmoe...
Pi-SAR-L2 data were investigated for their potential to detect areas covered by volcanic ash. Simultaneous field measurement of the dielectric constant of the ash was carried out alongside the Pi-SAR-L2 observations. The measured parameters were inserted into a semi-theoretical two-layer scattering model to describe σ0 from the ash-covered volcanic rocks. It was found that σ0 obtained using Pi-SAR-L2...
Mean and standard deviation of backscattering coefficients (σ0) of RISAT-1 data acquired over Mumbai in hybrid and linear dual polarizations have been analysed for various land features. Classification accuracy between RISAT-1 hybrid polarimetric data and RADARSAT-2 simulated hybrid polarimetric data has been compared. Wishart supervised and Support Vector Machine (SVM) classifiers are used for this...
We conducted a persistent scatterer interferometry of SAR images acquired by ALOS/PALSAR to reveal ground deformation related to the movement of active faults.
Due to its extensive and acceptable resolution, the use of scanning synthetic aperture radar (ScanSAR) image for ship detection has become a common application in ocean monitoring studies. In this paper, a new ScanSAR ship detector, which is based on the Hessian of Laplacian, is proposed. The radar echoes of ships and the antenna gain (AG) phenomenon of the ocean in ScanSAR image are investigated...
Field investigation of landslides area that distributed in broad area is very tough to engineers. Satellite remote sensing technology has applicability to landslides recognition and mapping of broad area therefore it has possibility to help engineer's work. In order to recognize landslides by satellite imagery, a lot of techniques and methodologies are proposed. In this paper, we focused on the use...
With the aim of developing a model for estimating building damage from synthetic aperture radar (SAR) data in the L-band, which is appropriate for Peru, we propose a regression discriminant function based on field survey data in Pisco, which was seriously damaged in the 2007 Peru earthquake. The proposed function discriminates among damage ranks corresponding to the severe damage ratio of buildings...
In order to improve the performance of block adaptive quantization (BAQ) when dynamic range of the Synthetic Aperture Radar (SAR) echo is far larger than the radar receiver's, this paper proposes a segmented BAQ algorithm for SAR raw data of strong target in weak background. Firstly, unlike traditional ADC processing, the 12-bit ADC system is used before BAQ. The quantization and saturation error...
Polarimetric SAR (PolSAR) has emerged as a powerful remote sensing technology and used for wide range of applications. Speckle suppression in PolSAR images is an important step for the extraction of meaningful information which is subjective in nature. In this paper, we propose Cornered Difference Weighted Mean (CDWM) SAR speckle filter. This filter is evaluated qualitatively, quantitatively and results...
Modern Synthetic Aperture Radar (SAR) systems operate with high bandwidths to achieve high resolution. But huge amount of data caused by high resolution and large swath can easily exceed the storage capacity and the transmittal bandwidth. Compressive Sensing (CS) techniques offer a framework for the detection and allocation of sparse signal with a reduced number of measurements. Under the framework...
This paper concentrates on the signal processing of Arc FMCW SAR, a novel concept of GB-SAR mode. The signal model and its properties are analyzed firstly. Based on the analysis, a new focusing algorithm for Arc FMCW SAR is developed, which accurately take the signal properties of Arc FMCW SAR into account. Therefore, it is more practical and accurate comparing to their counterparts. Simulation experiment...
To detect moving targets such as cars and ships, the National Institute of Information and Communications Technology (NICT) developed an along-track interferometric SAR (AT-InSAR) system and introduced its function to NICT's airborne SAR in 2011. This paper reports the validation of ship detection and verification of its performance. First, the performance of AT-InSAR was verified and confirmed by...
Information about structural movements or terrain activities is more and more affecting construction and geotechnical engineers' tasks and ultimately decision makers' choices. A continuous monitoring of critical environments is often needed, as for instance when supervising dikes, dams, towers, landslides, glaciers and unstable slopes in open pit mines. MetaSensing introduces the FastGBSAR, a novel...
Combined with Frequency-Modulated Continuous-Wave (FMCW) technology, airborne forward-looking array synthetic aperture radar (SAR) can obtain the image in front of the aircraft and also have the advantages of FMCW radar such as small size and lightweight. Moreover, it is suitable to be installed on platforms like helicopter and small unmanned aerial vehicle. To reduce the complexity of the hardware...
High resolution radars has many applications on ground monitoring application. Ground based SAR based on circle synthetic aperture is discussed in this paper. Since circle path SAR exists the contradiction between the resolution of azimuth and the capability of detection, Ground Spotlight SAR mode is proposed to solve the contradiction. On the basis of analysis of the geometry and of Spotlight SAR...
The paper introduces a simple experimental ground-based SAR (GB-SAR) system for studying SAR fundamentals. The SAR system is developed on a vector network analyzer (VNA), for example Agilent E5071C, with some useful built-in functions such as transform and gating. The procedure of acquiring the data by using the SAR system is presented in details. The acquired empirical data is also used to reconstruct...
Geosynchronous orbit synthetic aperture radar (GEO SAR) has a good application prospect for its short repeat period and a wider swath compared to current operating SAR. However, the large orbit height and swath demand high power and data rate. In this paper, a novel imaging mode of multi-pass stepped frequency (MPSF) is proposed based on the particularity of GEO SAR. By observing the same scenario...
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