Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
With appropriate geometry configurations, bistatic Synthetic Aperture Radar (SAR) can break through the limitations of monostatic SAR for forward-looking imaging. This paper develops an extended nonlinear Chirp Scaling imaging algorithm for translational variant BFSAR. The method utilizes a point target reference spectrum of generalized Loffeld's bistatic formula (GLBF). Without bistatic deformation...
This paper mainly deal with the degradation of the cross-correlated back-projection (CBP) imaging quality in the case of through-wall low signal-to-noise ratio (SNR), and an improved CBP algorithm is proposed to implement high-quality through-wall-radar imaging. Through accumulating all the sampling points rather than one sampling point of the cross-correlated target echoes into target location, the...
Time-delay estimation (TDE) is an important problem in radar target localization and range profile imaging. A common approach to TDE is matched filtering or equivalently cross-correlation, which is statistically optimal in white Gaussian noise. However, its performance greatly degrades in the presence of impulsive noise or non-Gaussian clutter. In this paper, a new concept called ℓp-correlation (0...
This paper presents theory, algorithm, and results of a new interferometry SAR (InSAR) method that is capable of generating digital elevation models (DEM) from the data acquired in an innovative bistatic configuration that uses orbital sensors as transmitters of opportunity and stationary receivers on ground. The novel approach distinguishes from the conventional InSAR methodology implemented in monostatic...
The paper discusses the benefit of using mismatched filtering in GSM based passive radar systems. The Inverse Filter (IF) proposed here is derived and an implementation method is developed taking into account the GSM burst structure. Afterward a performance comparison with Matched Filter is carried out. The improvement that IF can provide in terms of range resolution and weak target detection in the...
In this paper we deal with the problem of detecting extended targets embedded in Gaussian interference with structured covariance matrix. We model the target echo from each range bin as a deterministic signal with an unknown scaling factor that accounts for the target response. We also exploit some a-priori knowledge about the operating environment at the design stage. Specifically, we assume that...
In this paper we discuss the SAR processing algorithm and results associated with the ultra-wideband (UWB) orthogonal frequency division multiplexing (OFDM) system. An efficient method of OFDM SAR imaging for strip-map configuration has been proposed before; in this work we expand upon it and add a new configuration - rotational SAR. We derive the relevant parameters of the rotational SAR system;...
This paper discusses the implementation and verification of original methods for performing short-range navigation and detection in common indoor environments. These methods utilize a software-defined ultra-wideband (UWB) orthogonal frequency division multiplexing (OFDM) radar system. Specifically, the system is used to identify the presence of targets while being subjected to realistic noise and...
Due to the paucity of high-power sources along with strong electromagnetic absorption by water vapor at frequencies between ∼100 GHz and ∼10 THz, there are very few radar systems operating in the terahertz range of the spectrum. Source technology, however, is improving, thus facilitating radar systems operating in this gap. The Near-Millimeter Wave (NMMW) range typically refers to frequencies from...
In this paper, a particle filter (PF) method is proposed for target tracking based on a practical X-band nautical radar image sequence, using two histogram-based target models: a kernel-weighted histogram model and a background-weighted histogram model. In particular, the sampling importance resampling (SIR) particle filter is implemented to provide a recursively probabilistic estimation procedure...
The paper proposes a Passive Multistatic ISAR mode (PM-ISAR) for coastal surveillance based on the exploitation of multiple transmitting satellites and a single receiver (with multiple receiving channels). A proper processing technique able to focus the single bistatic images of the ship target of interest, to align them to the same reference plane and to properly combine them is introduced. The use...
This paper presents a new method in order to estimate the Radar Cross Section (RCS) of large objects in their environments. Object is defined as a volumetric surface and will be considered as a metallic target at a finite distance. This estimation is based on the use of dyadic Green's function method which includes near-field issues. Simulations have been made in a frequency band between 1 to 20 GHz...
Multiple input multiple output (MIMO) radar systems employ multiple transmit and receive elements with transmit elements that have the ability to transmit arbitrary waveforms simultaneously and receive elements that have the ability to process all of the transmitted signals jointly. For ground moving target indication (GMTI) systems, MIMO offers the potential to improve angular resolution and illumination...
RF Tomography is a technique to reconstruct an image of the area of interest using distributed transmitters and receivers assumed to be cooperating. This paper explores the possibility of using RF tomography when the sources' locations and waveforms are not known. With this added complexity, the system must 1) sense the environment to detect radar waveforms of opportunity 2) estimate the source's...
We present an overview of the radar retrieval processing system for estimation of root zone soil moisture (RZSM) in several major North American biomes as one of the products of the Airborne Microwave Observatory of Subcanopy and Subsurface (AirMOSS) project. The AirMOSS mission is briefly described along with the methodologies implemented to collect field data, to prepare several data layers required...
The Soil Moisture Active/Passive (SMAP) mission is scheduled for a late 2014 launch date. The mission will use both active radar and passive radiometer instruments at L-Band in order to achieve the science objectives of measuring soil moisture and land surface freeze-thaw state. To achieve requirements for a wide swath at sufficiently high resolution for both active and passive channels, an instrument...
The main focus of this paper is on the estimation of target motion parameters using bearing measurements. Here, based on a linearization of measurements, a recursive least squares (RLS) solution is developed. The performance of the proposed method is compared to PLE which uses the same approach in measurement linearization. Simulation results show the excellence of the proposed method over the PLE,...
This paper presents a high range resolution radar sensor working in the submillimeter-wave band for standoff detection and security applications. Low-cost technologies have been properly selected in order to implement a versatile and easily scalable radar system. A large operational bandwidth, required for high range resolution, is attained by means of a frequency multiplication-based architecture...
A novel STAP algorithm based on jointly sparse recovery technique using multiple snapshots, called JSR-STAP, is proposed in this paper. The new algorithm uses the combined l2,1 norm minimization to estimate the sparse spatial-temporal spectrum of measure data from the airborne array radar. Compared with traditional sparse recovery based STAP methods introduced in literature, the JSR-STAP extract a...
Accurate target geolocation is critical to ground moving target indication (GMTI) performance. Large geolocation errors can make interpreting GMTI detection results difficult, particularly in dense target environments. Geolocation errors can result from a combination of antenna channel errors and platform inertial navigation system (INS) biases. In this paper we develop clutter-based array calibration...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.