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The detection performance of a passive radar systems is generally determined by the received reference and surveillance signals purity. In recent times a number of interference cancellation techniques have been researched to deal with the disturbances on the surveillance channel. The variety of different methods operate in the space, time and frequency domains with having different implementations...
The Radar Research Group of the Budapest University of Technology and Economics has been developing a distributed passive radar system. Multilateration principle is used to locate uncooperative drones, by capturing radio traffic in the ISM bands. The proposed radar system should be integrated into a more complex reconnaissance scheme, where additional sensors (e.g. PTZ cameras, microphone arrays,…)...
The Radar Research Group of the Budapest University of Technology and Economics has been developing a distributed passive radar system. Multilateration principle is used to locate aircraft in the zone defined by the location of the receivers. The measurement principle challenges the conventional tracking algorithms, therefore a new solution was developed.
The detection performance of the passive radars systems is limited by the direct path interference. The application of digital beamforming antenna arrays in the surveillance channel has been proposed so far. The suppression can be accomplished with the proper beampattern synthesization. In this paper real measurement data utilising the spatial filtering techniques are presented. The detected target...
This paper addresses the design and evaluation of monopulse antenna array used in UAV on-board collision avoidance radar. The antenna array use the advantages of the fractal geometry. The inverted Koch square patch fractal antenna has been modified in order to gain more control over the efficiency degradation originating from production difficulties and to meet the requirements of a monopulse collision...
In 2007, a group of students at Budapest University of Technology and Economics had decided to realize the first Hungarian satellite, called Masat-1. In 2012, Masat-1 was launched from French Guyana by VEGA maiden flight (the first really own rocket of European Space Agency - ESA) to an elliptical orbit. Nowadays, Masat-1 is still working, although the planned lifetime was only 3 months. Our aim was...
A Passive radar system is able to operate fully independent of illuminators of opportunity. In most cases these illuminator sources are traditional telecommunication or broadcast signals. During the design of a passive radar we are trying to exploit the opportunities of an already existing system, thus we need to face such problems that could be simply eliminated during the design of a traditional...
The Radar Research Group of the Budapest University of Technology and Economics has been developing a distributed passive radar system. Multilateration principle is used to locate aircraft in the zone defined by the location of the receivers. This position estimation method is based on accurate time measurement. The current system uses the signaling of the secondary surveillance radar, specifically...
Microwave remote sensing based real vehicle movement estimator is under development. The application of this microwave sensor effectively increases the safety of traffic. The movement sensor provides further information about the estimation of the road-quality and the condition of shock-absorber, which are useful for the maintainer.
In this paper we present a method, and a fully implemented and tested hardware, for testing the operation of primary radars, may it be used in air traffic control or in military service. The realization of the radar tester was based on the theory of controlled radar cross section (CRCS), this way creating spurious targets or clutters, with known parameters, on the screen of the radar. According to...
Our aim is to develop a microwave receiver antenna system, which can form its radiation pattern (main lobe direction, null-point direction, structure of the side lobes), measure the direction of the RF source in milliseconds. In this paper we will show the theoretical background of the antenna system, the build-up of the realized system and some measurement results.
Our aim is to develop a microwave receiver antenna system, which can form its radiation pattern (main lobe direction, null-point direction, structure of the side lobes), measure the direction of the RF source in milliseconds. In this paper we will show the theoretical background of the antenna system, the build-up of the realized system and some measurement results.
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