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Multifunction RF systems which can operate with different RF functions like radar, communication and electronic warfare offer a variety of benefits beyond the well-known AESA (Active Electronically Steerable Antenna) features. To reach a sufficient technology maturity to start product development a series of challenges most stemming from the large required operation bandwidth have to be resolved....
This article is focused on Precision Approach Radar with active electronically scanned antenna AESA. For more detailed explanation is presented only azimuth antenna. It was explained by the fundamental principle of weighting in the mode of transmission and reception. Final results are presented on the realized antenna.
Operation of sky wave radar in Canada is challenged by the presence of ionospheric clutter from the earth's auroral zone due to severe Doppler spreading, which results in clutter-limited detection of aircraft. Elevation angle control in the transmit and/or receive beams to separate the target can mitigate the auroral clutter to some degree, but may not be always effective especially when operating...
A novel orthogonal frequency division multiplexing (OFDM) multiple input multiple output (MIMO) radar concept 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 utilizing the complete bandwidth. Whereas the known OFDM-MIMO radar concepts use an...
Advancements in high level integration of MMIC in package have led to the development of a system comprising of a multi-channel transceiver with antenna in package (AiP). Multi-channel systems provide additional advantage by enabling digital beamforming for direction of arrival estimation at 60 GHz. Different beamforming techniques are studied and practically implemented with a radar platform to find...
Under the ever more complex and dense electromagnetic environment, specific emitter identification (SEI) technique opens up prospects for discriminating and identifying different emitters of the same class. SEI is implemented by employing the unintentional modulation on pulse (UMOP), which is unavoidable and unique to individual emitters. However, the characteristics of UMOP have not been sufficiently...
In this paper, we present the new developments of the multiphysics numerical models designed for predicting the time-dependent electromagnetic signature of rocket engine plumes. We first describe the physical and numerical model for aerothermochemical physics and for electromagnetic applications. A mock up rocket engine (MoSER) has been designed and its signature has been measured in UHF and X band...
This paper addresses several issues which are novel in respect of the rapidly-evolving state of the art of low-terahertz radars: firstly, the sensitivity available from currently-available radars, secondly the likely effects of source noise and thirdly the effects of the fact that even relatively small targets, like people, occupy more than one resolution cell, as a consequence of the high resolutions...
Minimizing the dimension is one of the most challenging requirements for automotive radar sensor designs. Investigations for a very compact automotive radar antenna have been done based on TDK Low Loss LTCC. For the automotive radar band (76 – 81 GHz), an antenna element and a via transition have been simulated, manufactured and measured.
Over the past few years, the use of Multiple Input Multiple Output (MIMO) radar has gained increased attention as a way to mitigate the degredation of micro-Doppler classification performance incurred when the aspect angle approaches 90 degrees. In this work, the efficacy of co-located MIMO radar is compared with that of distributed MIMO. The performance anaylsis is accomplished for three different...
This paper introduces a novel concept of augmenting the coverage of an airborne monostatic maritime surveillance radar with an additional bistatic receive only node. The simulation is modeled in Matlab to evaluate the concept. For the radar and environmental parameters considered in this paper, it is found that a 22% increase in coverage area is obtained. A generalisation is presented which allows...
Ultra-wideband RF systems offer a multitude of advantages over narrow band systems. One major point is that these systems can perform multiple functions, like communications, radar and others all using the same aperture. This big advantage of these systems is at the same time their biggest handicap: The wideband receivers are open to much more types of signals compared to narrow band systems. Due...
In order to both lower the cost and improve the technical capabilities of commercial and civilian phased array radars dramatic cost and size reductions of basic MMIC components and modules when compared to the present military system approaches must be realized. These cost reductions and capability improvements can only be achieved by radically changing the radar architecture from the traditional...
In this paper, the construction of a modular target simulator for automotive radar sensors is described. Using a fully analog design, the simultaneous covering of all E-band automobile radar bands is possible. Static scenarios and moving targets with realistic parameters can be simulated.
Today's electronic warfare (EW) systems require fast electronic intelligence (ELINT) to measure frequency parameters of radars and to scan predefined frequency bands for possible target radar emissions. Target radar signals are usually strictly time limited events and ELINT systems should be able to catch these emissions and categorize the source radar according to its threat library in a very short...
Cheap and easy to use, landmines are among the favourite weapons in civil wars and wars of insurgency and are used by governments and guerrillas alike. These “eternal sentinels” stand guard long after the conflicts have ended and kill and maim without mercy or discrimination. Therefore, there is a pressing need to remove these devices and to clear the contaminated land. As many landmines have low...
This paper introduces an approach to combine a FMCW MIMO radar frontend with a communications datalink frontend all integrated in a single Printed Circuit Board (PCB). The chosen MIMO configuration allows to integrate communication antennas without increasing the size of the PCB. The system is all incorporated in a single planar PCB with 36 radiating elements, 16 for receive (RX) and 16 for transmit...
In this paper two closely spaced circularly polarized on-chip antennas each fed by a differential 90° branchline coupler are investigated. The antennas are radiating by the principle of an integrated lens antenna and can be used as antennas of an amplitude monopulse radar with two separated receivers. The common broadside radiation of both antennas feeding the transmit path is superposed by the beam...
The capability of identifying remote-controlled Micro Aerial Vehicles (MAVs), which pose a growing threat on critical infrastructure areas, is of great importance nowadays. The low cost, the easy handling, and a considerable payload make them an excellent tool for unwanted surveillance or attacks. Most platforms can be equipped with all kind of sensors or, in the worst case, with explosive devices...
This paper concerns the use of Frequency Modulated Continuous Wave (FMCW) radars for Radio Frequency Identification (RFID) transponders identification and range localization. In our study, we consider the transponder identification by applying a shift frequency to the RFID transmitted signal. Consequently, our investigation addresses the spectral analysis of the received signal on the FMCW radar....
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