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.
In this paper, a short review of radar cross-section (RCS) profiles of typical metallic shapes of targets is addressed. The aim is to show that the intensity of forward-scattering usually prevails over backward-scattering, especially at higher frequencies. It is also shown that a large geometrical aspect ratio of typical obstacles leads to more omnidirectional scattering in one of the scattering planes...
The paper presents a concept of the parametric autofocus method for Passive Inverse Synthetic Aperture Radar (ISAR) imaging of air targets. To create a focused ISAR image, the precise knowledge of an object trajectory is required. In this paper a theoretical model of the target motion and an algorithm for finding the best set of estimated motion parameters are described. Simulated results of ISAR...
The paper presents an analysis of radar image distortions caused by using the Polar Formation Algorithm (PFA) for Inverse Synthetic Aperture Radar (ISAR) image creation in multistatic passive radar. The Passive ISAR technology is still in the development stage, and many challenges and limitations have to be overcome before it would be applied in the commercial operating passive coherent location (PCL)...
This paper presents a study on the possibility of using Synthetic Aperture Radar (SAR) and Inverse SAR (ISAR) imaging techniques in passive radars, utilizing commercial continuous wave transmitters as illuminators of opportunity. In presenting potential applications of this novel technology, obtainable maximum ranges and resolutions in passive SAR/ISAR technology are discussed. In the paper the main...
This paper presents a concept of passive ISAR imaging of air targets using DVB-T transmitters as illuminators of opportunity. The presented concept has been successfully proved using both simulated and real data collected during a measurement campaign carried out by the Warsaw University of Technology in Poland. All stages of the signal processing algorithm for bistatic passive ISAR imaging have also...
Wzrost liczby turbin wiatrowych, który można zaobserwować w ostatnich latach, wpływa na skuteczność systemów radiolokacyjnych, zarówno aktywnych, jak i pasywnych. Sygnał odbity od turbiny wiatrowej, tak od części ruchomej, jak i od stacjonarnej, może zostać odebrany przez radar i błędnie zinterpretowany. Oprócz możliwości nasycenia przetworników z uwagi na dużą powierzchnię skuteczną turbiny, można...
W artykule opisano zasadę działania radaru pasywnego wykorzystującego jako źródło promieniowania nadajniki naziemnej telewizji cyfrowej. Opisano geometrię bistatyczną dla radaru pasywnego. W artykule przedstawiono także aktualne wyniki prac prowadzonych w Instytucie Systemów Elektronicznych w tematyce radiolokacji pasywnej z wykorzystaniem danych rzeczywistych zarejestrowanych podczas ostatnich kampanii...
This paper presents the results of the detection of fast maneuvering air targets (e.g. air fighters) using GSM based passive radar. The results were obtained during the measurement campaign carried out by the Warsaw University of Technology on the Polish coast of the Baltic Sea. The main goal of the trials was to verify the possibility of the utilization of a GSM passive radar as a short range air...
This paper presents the new application of using GSM-based passive radar for the ground moving target detection and imaging using Inverse Synthetic Aperture (ISAR) technique. The concept has been verified via the simulation and measurement campaign, where the signal reflected from the ground vehicles (cars and trucks) has been registered and processed. As the final results authors obtained images...
The paper presents the concept of passive radar exploiting the active Air Traffic Control (ATC) radar as the source of illumination, and the primary results of the measurement campaign carried out at the DSP Laboratory of the Warsaw University of Technology. The system, built using commercial off the shelf components, was able to detect and track airliners landing at Warsaw airport. To verify the...
This paper presents an overview of recent research and developments in passive radars at Warsaw University of Technology. The main goal is to show potential of passive radars to provide wide area covert surveillance to protect sensitive infrastructure and strategic objects (e.g. embassies, airports, power plants, railway station, etc.). The study presented in the paper shows that passive radar technologies...
The paper presents a concept of a GSM based passive bistatic radar for the monitoring of the velocity of ground vehicles (passenger cars, buses, trucks, etc.). The concept presented is an alternative low-cost solution which can be successfully used in many applications where traditional active radars are nowadays commonly applied (e.g. speed control, traffic monitoring, etc.). The paper presents a...
In this paper the passive radar used as a transmitter of opportunity GSM BTS stations has been proposed for vehicle traffic monitoring. The paper presents a feasibility study on using GSM signals for traffic control in different environments including urban areas, highways and small agglomeration roads. The initial analysis shows that such system can be successfully used to extract traffic parameters...
This paper presents the concept of an airborne passive radar and the preliminary results of the experiments carried out using two mobile platforms: a car and an aircraft. In the research conducted for the study of this concept, a passive radar mounted to an aircraft was used. The radar utilizes signals transmitted by illuminators of opportunity, e.g. FM radio or DVB-T transmitters. In this way, it...
The paper describes the results of a conception-stage experiment with a ground-based bistatic noise SAR (Synthetic Aperture Radar) demonstrator. Its aim was to research the ability of a simple Commercial-Off-The-Shelf (COTS) build system to provide a bistatic SAR image using non-cooperative illuminator. The noise signal used in the experiment is similar to a signal used in many transmission systems...
In the paper, an analysis of bistatic tracking accuracy in passive radar is presented. The influence of parameters such as integration time, probability of false alarm, signal-to-noise ratio and spectral density of process noise is investigated. Simulations are performed for three popular types of illuminators of opportunity: FM, DAB and DVB-T.
The paper presents a comparison of three different computing platforms for signal processing in Passive Coherent Location radar: general-purpose PC, Sony Play Station 3 and NVIDIA graphic card with CUDA technology. The radar under consideration was developed at Warsaw University of Technology, and it is called PaRaDe (Passive Radar Demonstrator). It utilizes commercial FM radio transmitters as illuminators...
Passive Coherent Location (PCL) radar measures the bistatic parameters of a target: the time difference of arrival and the Doppler shift. In order to localize a target in the Cartesian coordinates, the data from multiple transmitter-receiver pairs can be used. This task is, however, challenging due to the ambiguities in the measurements assignment. In the paper, a tracking algorithm is presented,...
The paper presents a family of passive coherent location (PCL) radar demonstrators, called PaRaDe (passive radar demonstrator), which were developed at Warsaw University of Technology. The systems exploit commercial FM radio transmitters as illuminators of opportunity in order to detect and track airborne targets. In the paper, the details of demonstrator systems are described and the results obtained...
A new class of signal processing algorithm based on CLEAN methods primary introduced in radio-astronomy is presented in the paper. The classical radar signal processing is based on match filtering concept, which is optimal in mean square sense in case, when single target echo is detected against white or colour Gaussian noise. Such approach was effective when pulse radar have been widely used. The...
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.