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In this paper, the E-pulse (extinction pulse) method known as aspect-independent ultra-wideband radar target discrimination technique is discussed. An alternative synthesis algorithm for the subsection polynomial E-pulse is introduced. The algorithm consists in building a skeleton E-pulse, its further extending and series of integration which all could be performed over the coefficients of basic functions...
A major future challenge to providers of nautical equipment and navigational radar systems is to make such systems affordable to cost-sensitive customers in the commercial maritime market. This paper presents an approach for a combined S- and X-band navigational phased array radar. The state of the art as well as expected advantages of the proposed solution are discussed. This study also provides...
Vehicle speed detection in a highway can be performed using either laser or radio-frequency (RF) signals. Since laser speed detectors are prone to weather conditions and easy to jam, they are not preferred in practical applications. However, FMCW radars in the GHz frequencies provide excellent distance and speed measurement performance where high accuracy and reliability are needed. In this study,...
In this work, we have presenteda focusing algorithm for tree-penetrating radar applications. The details of our imaging and focusing algorithm to detect cavities inside a tree-body were given. First, the algorithm has been tested with the simulation data that were generated by the help of perfect point scatterers. Then, the algorithm was applied to the measurement data that have been collected from...
This paper report on the development and field trial of a dual-band and dual-use system based on a single photonics-based transceiver and a single radiating element, able to simultaneously carry out radar and communication functionalities. The coexistence of the two operations does not introduce any penalty on the system performance. The innovative sharing of both transceiver and antenna element allows...
This paper presents an experimental system dedicated for the detection and tracking of small aerial targets such as Unmanned Aerial Vehicles (UAVs) in particular small drones (multirotors). The system was proposed in response to increasing drone popularity and the related threats. The hardware and software parts of the system are covered, including the analogue front-end, FPGA based pre-processing...
In this paper, we introduce our recent experiment for ground moving train imaging by a Ka-band dual-channel radar of 2GHz bandwidth. High resolution images of two receiving channels as well as along-track interferometric-phase image are obtained. Both radial velocity and azimuth velocity of the train are estimated from the images. From the interferometric phase along the train body we have observed...
In this paper front-end design for a Ka band milimeter wave (MMW) radar which consists of an antenna, a low noise amplifier (LNA) and a band pass filter is presented. The operation frequency of the designed system is between 24–25 GHz in Ka band. A high gain axially displaced elliptical (ADE) dual reflector antenna is employed on the antenna structure. ADE sub-reflector with 5 cm diameter is illuminated...
In this paper the possibility to distinguish hydrometeors with similar polarization properties inside the reflecting volume and estimating their differential impact onto polarization properties of reflected signal is made. The results are important for different practical applications of radar meteorology including drop size distribution estimate, rainfall intensity estimate, wind speed measurement,...
This paper presents the ground moving target imaging algorithm for dual-channel high resolution SAR images. The algorithm is thoroughly described, including target detection, extraction, imaging and velocity estimation. Selected results of the real airborne mission are presented and further research and improvements are proposed. The radar system used and the test scenario are also briefly described...
A novel concept of orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) radar for automotive applications is presented in this paper. Multiple transmit antennas are multiplexed via OFDM subcarrier interleaving. Such a multiplexing enables a simultaneous operation of transmit antennas, while the complete bandwidth is utilized by each of them. Whereas the known OFDM-MIMO...
In this paper the experimental results of C-band synthetic aperture radar (SAR) system integration on an unmanned aerial vehicle (UAV) are shown. The goal of the presented trials was to check the capabilities and limitations of the SAR system in UAV applications. The trials were conducted with a UAV system developed and operated by the Portuguese Air Force Academy (PAFA) using a compact SAR system,...
POWERS is a polarimetric weather radar signal simulator developed by the RaSS (Radar and Surveillance System) Laboratory. This software allows to produce realistic weather radar measurements from a known meteorological scenario, generated by the WRF (Weather Research and Forecast) model. One of the problems encountered when developing complex simulators like POWERS, is to identify a number of methods...
This paper demonstrates performance evolution starting with a traditional one band active radar through a two band radar using MIMO (Multiple Input Multiple Output) data and signal fusion ending with a two band radar with some of a cognitive features such as resource management and waveform diversity. A probability of detection of small RCS targets can be improved by utilization of some MIMO processing...
The bistatic radar network has significant advantage over the network of monostatic radars in terms of the system cost. Moreover, the separation of transmit and receive radar units lead to better system performance in contrast to monostatic radars. However, the number of transmit nodes is often limited by the system costs and available resources. To address this issue, we present the approach of topology...
The NATO SET-225 Research Group is planning a series of live trials of Noise Radar technology to be performed in summer, 2016 at the Fraunhofer FHR Institute in Wachtberg (near Bonn). The preliminary architecture of the Demonstrator to be used in these trials is described starting from aims and requirements and arriving to define the main system functions, the parameters and the signal processor....
A carrier- and Doppler-tunable Active Radar Calibrator (ARC), consisting of a receive antenna and transmit antenna, with an FPGA-based digital signal processing in between, followed by an RF amplifier, is proposed as a tool for conducting high-precision calibration measurements of continuous-wave (CW) radar systems. The ARC can be designed to have a large radar cross section and a flat wideband frequency...
Maritime radar is one of the main sensors used on board of the vessel. Managing radar information is currently a task of separate radar systems or integrated navigational systems. However ICT systems used on board and in marine environment have become more and more sophisticated and navigational radar on board is definitely a part of them. The idea presented in this paper is to use object modelling...
The paper presents considerations on presenting of radar data in mobile systems used for navigation in inland waters. The concept of using modern achievements of mobile cartography for this purpose is given. Such approach allows enhancing and facilitating of radar information interpretation, especially for unexperienced users. Short analysis of radar information in inland navigation is included, followed...
The measurements presented in this paper show that feature extraction can be used to identify objects of interest by making use of the scattering present and angular resolution available when using low TeraHertz (low-THz) (0.1 THz-1 THz) devices. The results shown were obtained by measuring two different types of overhead power cables of similar size but with different surface structure which causes...
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