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This paper develops the fundamental performance bounds for a radar operating in the presence of communication interference. To do so, we recast radar as a communication problem with the radar waveform acting as a convolutional encoder, which allows for the description of the achievable information-theoretic limits of the radar problem. While information theory has been applied to communications and...
In passive radar, the receiver is limited to commercial waveforms from various emitters of opportunity. In addition, the geometry in three dimensional space between the receiver and various transmitters creates many performance considerations when applying space time adaptive processing (STAP). This paper presents the difference in signal-to-interference-plus-noise ratio (SINR) performance for different...
In the frame of the research activities of the NATO SET-184 group, and thanks to the NATO SET Panel support, experimental tests of the Noise Radar Technology have been carried out in (and near to) Warsaw, in the Autumn of 2013. The paper describes why the particular experiments were made, placing them within the context of previous noise radar trials and with those which will be carried out in summer,...
There are high range sidelobes for Pseudo-random Code Phase Modulation Continuous Wave (PRC-CW) radar due to the characteristics of the code waveform. In order to suppress the range sidelobes and improve the detection performance, we present a method on the basis of Gold sequence. Given a bunch of Gold coded waveforms, a randomly selected waveform is transmitted. The receiver has the knowledge of...
This paper presents strategies of the target localization in passive bistatic radar in the presence of multiple receivers and non cooperative illuminators. One of the algorithms based on ellipsoid intersections is analyzed. The individual target position is calculated from the bistatic range (BR) measurements using closed form equation based on the time difference of arrival (TDOA) algorithm. Aim...
In this paper is described an experimental passive localization system based on SDR (Software Defined Radio) components. This system is designed to measure Time Differences of Arrival (TDOA) of radar pulses between two platforms. For a TDOA system, time error between the two receivers must be kept very low, which requires a very accurate way to synchronize the time bases. In this purpose, a custom...
In order to sort signals from the emitters with the same type, a sorting method based on fractal dimensions of pulse envelope's front edge is proposed in this paper. Firstly, a novel signal sorting flow based on fractal dimensions is presented. Then the approach for extracting the box dimension and information dimension of the pulse envelope's front edge is given. Finally, simulated signals and actual...
Within this special session paper we present a selection of our designed and prototyped silicon integrated circuits realized in SiGe BiCMOS technology at 10 GHz and 35 GHz. The circuits have been prototyped within European Space Agency contracts that SIRC implements as well as in an NCBiR project. The ICs, prototyped in IHP SG25V and SG13S technologies, have been mounted as chip on board and measured...
Passive radar networks offer several advantages compared to standard single radar. For instance a target is illuminated from different aspect angles and this leads to an increase of the detection performance and higher position estimation accuracy. Beside these both improvements the network is able to cope with an increased number of targets and the range/Doppler resolution is enhanced. As the system...
Communication system performance under jamming can be analyzed in most cases if the jamming hit rate (the percentage of jammed bits) is known or could be estimated. Radar electronic warfare (EW) engineers have used the theory of coincidence of pulse trains for similar situations with success. However, the theory does not hold for communications in all scenarios, especially if a fast sweeping (or stepping)...
A procedure of tacking small flying object based on a general principle of FMCW and Doppler radar is presented. In order to increase measurement range, this technique uses active signal source on the moving object. For simultaneous measurements of distance, radial velocity and direction (AoA) as well as simplified synchronization a combined FMCW-CW waveform is proposed. The presented measurement system...
This paper describes the problem of finding an optimum radar signal processor by taking into account the limited dynamic range of the receiver. The nonlinearities, the phase noise and other limitations effects of radar receivers have been extensively studied in the open literature. However, to the best of authors' knowledge, the above studies do not adequately cover the topic of finding the optimum...
This paper considers the localization of an emitter with an unknown linear frequency modulation (LFM) signal in the passive radar systems based on the direct position determination (DPD) method. To improve the localization accuracy, a novel strategy, wherein the position of the emitter and the unknown transmitted signal are jointly estimated, is proposed. As a result, a six-dimensional estimation...
In this paper, we investigate the demodulation of a communication signal that is interfered by a high-powered radar signal. We choose quaternary phase-shift keying (QPSK) modulation for illustration. A least squares estimator (LSE) is used to estimate the amplitude and phase of the interfering radar signal to be used for interference cancellation. Then a maximum likelihood detection (MLD) receiver...
Accurate classification or recognition of phase modulated radar waveforms, typically accomplished via the combination of pulse parameter estimates and matched filtering, poses a simple problem in ideal conditions. In less than ideal conditions, carrier frequency, time offset, pulse amplitude, initial phase, and bandwidth are unknown to the electronic warfare (EW) receiver rendering the application...
In this paper, we use an information theoretical sensor placement algorithm to assess the impact of target camouflage, concealment, and deception (CCD) effects on classifier performance. Physics-based target models are constructed to exhibit varying CCD effects of a single target class. An information theoretical sensor placement algorithm is used to identify potential sensor locations yielding highly...
Dual-function radar-communication (DFRC) systems enable information embedding into the radar signal emission. Existing methods for non-coherent phase-modulation DFRC employ multiple pairs of orthogonal waveforms and embed one communication symbol into each pair. The total number of symbols is equal to one-half of the number of waveforms. In this paper, we propose a new signaling strategy for embedding...
With an increasing need for worldwide counter-terrorism, security is becoming a top priority on the agenda of local governments. Governments has enforced patrols, security forces, and security equipments such as door frame detectors, screens and hand-held detectors in public places like railway stations and airports. The main purpose of these security equipments is to detect potentially dangerous...
RADAR (Radio Wave Detection and Ranging) systems are widely used now days for detecting a target, obtaining its location along with direction and velocity of detected object. Most challenging part in RADAR system is to getting better accuracy in range estimation and also frequency jamming. In this paper, I have designed a radar system transmitter and receiver using direct sequence spread spectrum...
Even though the wireless positioning in sensor networks has been extensively studied in the past decades, there is no contribution discussing positioning the receiver that belongs to another system, i.e., the third-party receiver. In this paper, we propose a new scheme to solve the problem by full-duplex rtechnique. In our scheme, we let the sensors conduct the full-duplex relay for the target receiver...
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