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Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
Space-borne digital array SAR with the character of flexible digital beam forming, high precision phase and amplitude control, and flexible sub-antenna construction is the most attractive device in the modern dynamic earth environment remote sense project. The digital array SAR can easily reach the multi-mission multi-mode, both high resolution and wide swath (HRWS), and adaptive-anti-interferer requirements...
Phase unwrapping (PU) is important in reconstructing the digital elevation model (DEM) of a scene from its interferometric synthetic aperture radar (InSAR) data. The traditional minimum discontinuity PU algorithms are highly accurate while with time-consuming computation. To solve this problem, we combined a novel idea, fast pre-unwrapping where dipole cuts are generated and optimized, with Flynn's...
This study analyses the spatial resolution for the low frequency (LF) ultra-wideband (UWB) one-stationary bistatic synthetic aperture radar (OSBSAR) system. It considers the wavenumber coupling and radar squint angle to derive the finest possible spatial resolution. First, the spatial wavenumber of the LF UWB OSBSAR echo data of the target is analyzed. Then, its spatial resolution is derived based...
Recently, microwave remote sensing has been used for observation of the global environment extensively. There are many techniques in the microwave remote sensing. Among them, SAR (Synthetic Aperture Radar) Tomography is one of the emerging technique that can realize three dimensional imaging, by using multiple flight paths. The data pixels in each SAR image obtained at the slightly different paths...
A novel aperiodic phased array for space-borne synthetic aperture Radar (SAR) is presented which has fewer active chains than a corresponding periodic phased array while maintains comparable radiation performance. The design of proposed aperiodic phased array is based on equal amplitude sparse array. Compare to other aperiodic sparse phased array antennas for space-borne SAR which have been reported...
In this paper, improved subaperture clutter suppression method for synthetic aperture radar (SAR) moving target imaging is proposed. Theoretical basis of subaperture imaging method is given. The position rules of moving target and clutter in subaperture are utilized to separate and reduce clutter effectively while preserve the moving target signal. The suppression process is implemented automatically...
In order to improve the radiometric precision of Synthetic Aperture Radar (SAR) image, this paper analyses the power-loss of SAR raw data which is caused by block adaptive quantization (BAQ) and then proposed a compensation method. Firstly, the saturation factor γclip is defined and then a unified model of BAQ compression is proposed by using the concept of normalized quantizer. Secondly, the signal...
Interferometry synthetic aperture radar (InSAR) is a remote sensing technique for obtaining high-quality digital elevation mode (DEM). Without temporal decorrelation, the efficiency and accuracy of bistatic and multistatic SAR are better than the single-pass interferometry. Multiple phase center (MPC) SAR increases the spatial sampling rate to overcome the contradiction of wide-swath observation and...
Phase unwrapping is an important part in the process of InSAR signal processing. When ground-based SAR is used for multistage mountain slope deformation monitoring, the mountain slopes are always separated by slope ladders. So the interferometric phase of every slope must be unwrapped by path-following methods respectively. In view of the multistage slope phase unwrapping, this paper proposed a mask...
This paper formulates a Stokes vector (SV) based decomposition algorithm for compact polarimetric (CP) SAR under π/4 mode. The three-component scattering model is first established by using the relationship between covariance matrix and SV, and then the contribution of each component is estimated from algebraic calculation. To solve the underdetermined equations for π/4 decomposition, the contribution...
A microstrip-parallel strip-fed circularly polarized spiral antenna is investigated. A wideband microstrip to parallel strip transition is designed in order to feed the spiral antenna. The transition shows a back-to-back return loss of better than 10 dB from 0.045 to 20 GHz except for a ripple at 2 GHz, while the back-to-back insertion loss is less than 2.4 dB. The final antenna shows a return loss...
This paper presents the design results of the multi-band, multi-mode software-defined radar (SDR) system. The SDR platform consists of a multi-band RF modules of S, X, K-bands, and a multi-mode digital modules with a waveform generator for CW, Pulse, FMCW, and LFM Chirp as well as reconfigurable SDR-GUI software module for user interface. This platform can be used for various applications such as...
This paper presents the development results of the software-defined radar (SDR) platform testbed. The SDR platform consists of a RF and digital hardware modules as well as reconfigurable software module. As a test result, the spectrogram analysis shows that the micro-Doppler signature of the small pendulum motion can be accurately detected and discriminated using the developed SDR platform testbed.
In this paper, a dual-band, frequency-modulated continuous-wave (FMCW) radar for short-range through-wall detection is proposed and implemented. This radar adopts a shared-aperture antenna technique for reducing antenna area and high-speed chirping to avoid flicker noise. It operates at the S-band (3 GHz) and the X-band (9 GHz), with 486 MHz chirp bandwidth and 860 MHz chirp bandwidth, respectively...
The Snapshot imaging radar based on antenna array can achieve high-resolution imaging both in spatial domain and time domain. In this paper, the snapshot imaging radar located on helicopter platform is studied. The paper mainly focused on the influence on the echo caused by the vibration characteristics and non-ideal trajectory of helicopter platform. Firstly, adopting frequency modulated continuous...
This paper presents a new concept of Space-Airborne Bi-Static Linear Array SAR (SA-BiLASAR) imaging using array antenna, which inherited the advantages of conventional linear array antenna 3-D SAR and Bi-Static SAR. Firstly, the geometrical model and the signal model are established. Secondly, a time domain back projection imaging algorithm is presented for SA-BiLASAR data processing. In the end,...
Due to platform uncertain motion, the trajectory of airborne millimeter-wave interferometric synthetic aperture radar (MMW-InSAR) usually demonstrates highly non-linear associated with position errors. Hence, motion compensation must be considered for airborne MMW-InSAR high resolution imaging. In this paper, a back projection (BP) autofocusing algorithm via maximum sharpness is presented for MMW-InSAR...
In this paper, we describe a simple method for SAR image synthesis of a realistic target model using the general purpose EM simulator like FEKO and demonstrate the steps by processing the simulated SAR raw data with chirp-scaling algorithm (CSA), which is one of the most widely used SAR image formation algorithms. This method can benefit us many advantages like performance evaluation for target detection,...
As an emerging technique to obtain remotely sensed data, geosynchronous synthetic aperture radar (GEOSAR) is still at the infant stage for the development of the basic theory although some prediction indicates that the first GEOSAR satellite would be in orbit around 2020. Before the launching, a series of challenges in GEOSAR must be addressed and the feasible solutions should be carried out. Thus,...
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