The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A new change detection method for heterogeneous remote sensing images (i.e. SAR & optics) has been proposed via pixel transformation. It is difficult to directly compare the pixels from heterogeneous images for detecting changes. We propose to transfer the pixels in different images to a common feature space for convenience of comparison. For each pixel in the 1st image, it will be transferred...
Synthetic aperture radar (SAR) ship detection is an important application in the context of environment and security monitoring. With the rapid development and demanding requirement of high resolution and wide swath SAR, the volume of data acquisition becomes increasingly large as well as higher hardware complexity. Compressive Sensing (CS) theory, as an effective and accurate signal reconstruction...
The multiple measurement vectors (MMV) model can be used to effectively represent the jointly sparse signals. However, this model cannot be directly used in the scenario of synthetic aperture radar (SAR) imaging. The reason is that, the MMV model requires that the multiple sparse vectors have the common sparse pattern, while the SAR range profiles at different pulses have different sparse structures...
In this paper, a novel multilateral synthetic aperture secondary radar concept and its application for precise 3D localization of a robot tool center point (TCP) are introduced. A backscatter transponder is attached to the TCP of a robot. Spatially distributed FMCW secondary radar units pick up the backscattered phase coherent transponder signals. Based on assisting relative sensors, a synthetic aperture...
An algorithm based on matching pursuit (MP) technique is proposed for inverse synthetic aperture radar (ISAR) imaging of maneuvering targets. The received ISAR echo is decomposed into many basis sub-signals that are generated by discretizing the target spatial domain and synthesizing the ISAR data for every discretized spatial position, and then the ISAR imaging problem is converted into the sub-signal...
An algorithm based on compressive sensing (CS) is proposed for synthetic aperture radar (SAR) imaging of moving targets. The received echo is decomposed into the sum of many basis sub-signals that are generated by discretizing the target spatial domain and velocity domain and synthesizing the SAR received data for every discretized spatial position and velocity candidate. In this way, the SAR imaging...
Based on the parametric velocity synthetic aperture radar (VSAR), the novel model of VSAR with azimuth multi-look processing is first established in this paper. Furthermore, Cramer-Rao bounds (CRBs) are derived for the VSAR model parameters estimation based on the maximum likelihood (ML) methods. It is shown that the clutter parameter estimation accuracy may be improved via azimuth multi-look processing...
A synthetic aperture radar (SAR) data reformatting approach named Doppler Keystone transform (DKT) is proposed to correct the range migration of the moving target. By combining the DKT and the Doppler phase compensation methods, the moving target can be well imaged in high signal-clutter-ratio (SCR) case. Moreover, the DKT-based algorithm is suitable for parallel implementation.
Based on the pixel vector sampled among multi-images, VSAR may effectively suppress the strong ground clutter and realize the moving target detection and locating. In this paper, the Cramer-Rao bounds (CRBs) are derived for the estimation of a proposed VSAR model parameters, as well as the azimuth locations of moving targets, and the maximum likelihood (ML) methods are further proposed to reach these...
Reflectivity displacement method (RDM) is a classical algorithm of synthetic aperture radar (SAR) autofocus processing, whose performance degenerates with low contrast of the scene. This paper proposes an improved RDM for SAR auto focusing. Based on the relationship between the Doppler rate and the range, the proposed method can adoptively overcome the effect of the low contrast on the Doppler rate...
By dividing a vector sampling at a specified pixel into three components, namely target, clutter, and noise, a novel parametric statistical model is proposed in the multi-channel and multi-look image domain of velocity synthetic aperture radar (VSAR). With the proposed parametric model, an adaptive moving target detection method is also obtained for VSAR, based on which the optimum improvement factors...
In this paper, a new system called minimum redundancy linear array SAR (MRLA-SAR) is proposed. Using multiple complex images formed by multiple antennas with a special configuration, MRLA-SAR can not only suppress the stationary clutter, but also locate and image both slowly and fast moving targets accurately. Numerical experiments are also presented to demonstrate the effectiveness of MRLA-SAR
In the velocity synthetic aperture radar (VSAR), multiple moving targets in image domain may be superposed in the same range-azimuth cell and, therefore, may not be easily distinguished from each other. This phenomenon is named "velocity layover" of multiple moving targets in this paper. A super-resolution spectrum estimation method, i.e., spatial projection processing, is used to solve...
In conventional methods of velocity estimation of moving targets using single antenna SAR, if the Doppler-shift exceeds PRF/2, in other words, if the radial velocity of a fast moving target exceeds the "blind velocity", the radial velocity estimation ambiguity will occur. In this paper, a novel method is proposed to detect and image fast moving targets. Specially, this method can accurately...
In this paper, a new system called non-uniform linear antenna array SAR (NULA-SAR for short) is proposed. Using multiple complex images formed by multiple antennas with special configuration, NULA-SAR can not only suppress the stationary clutter, but also locate and image both slowly and fast moving targets accurately. Numerical experiments are presented to demonstrate the effectiveness of NULA-SAR
To improve the ability of suppressing clutter as well as locating the moving targets without any ambiguity, dual-speed velocity SAR (DS-VSAR) is proposed in this paper. In DS-VSAR system, the platform flies with two different specified speeds in the imaging time duration. Multiple complex images are formed by multiple receiving antennas and transmitted into velocity-images (V-images), where moving...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.