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.
As one of the important steps in the process of self-organization of wireless ad hoc networks, neighbor discovery has substantial influence on the network performance. Especially in the modern warfare environment, the time consumption of neighbor discovery is very important for holding the battlefield situation. In this paper, we address the problem of neighbor discovery in ad hoc network with double-face...
In this paper, we leverage previous work on securing Automatic Dependent Surveillance Broadcast (ADS-B) to propose a secure ADS-B framework that substantially enhances the original safety and security solutions. The enhancements are obtained by feeding real flight data along with malicious data at the secure ADS-B sender and observing the outcome at the secure ADS-B receiver that we developed as part...
Information fusion is an important step in cooperative reconnaissance signal processing, which can be divided into three types: data-level, feature-level and decision-level fusion. Data-level fusion has the advantage of information completeness but the large data volume makes it hard to apply practically. Based on the sparse representation of intercepted signal and the correlations between signals,...
Cognitive Radio (CR) is an intelligent method for opportunistic access of idle resources and a solution for spectrum resources scarcity. In this article a new technique for spectrum access is proposed. This technique combines spectrum sensing with geolocation database. The proposed technique is employed in radar bands of (960–1400 MHz, 2.7–3.6 GHz and 5–5.85 GHz). These bands occupy quite large bandwidth...
The recovery of polarization and direction of arrivals (DOAs) of multiple targets locating at the same range but different angles in the forward-looking direction is of great trouble for conventional active radar. Based on compressive sensing (CS) framework, a joint polarization-DOA estimation strategy for single-input-multiple-output (SIMO) radar is proposed, which can reconstruct the sparse target...
In the TDOA location of multi-Radar System, steepest descent method which is the commonly method has small amount of calculation while it's jagged, slow convergence, and the step size is difficult to choose. Although the genetic algorithm could accurately solve the global optimal solution, but the speed of convergence could slow down with the iterative process. The article proposed the TDOA location...
In this paper performance of a symbol-based WCP-OFDM radar estimation algorithm is studied. Particularly, benefits of using orthogonal time-frequency localized pulses rather than biorthogonal rectangular pulses (traditionally used in CP-OFDM receiver) is investigated in presence of white Gaussian noise. Numerical examples show that the former provide better dynamic range and tolerance to Doppler for...
EMI/EMC issues are the most important design challenges for modern electronic systems. The problem becomes quite complex in case of mixed signal processing. Traditional techniques for noise and interference reduction may not produce desirable solutions in such situations. Frequency Modulated Continuous Wave (FM-CW) Radar Altimeter required for altitude measurement during landing aerial vehicles is...
By sharing hardware resources, integrated radarcommunication systems can effectively solve issues of high cost, complicated electromagnetic environment, and inefficient information processing, which the traditional systems with individual radar and communication models suffer from. For integrated radar-communication systems, accurate channel estimation is essential to guarantee the system performance,...
Radar systems are widely used for military, transportation and scientific purposes. For radars, the ability of the device to mitigate the effects of noise and interference is of great importance because it will determine its performance. Radars may suffer from attacks aimed to hinder their performance, known as jamming attacks. In this context, noise jamming attacks are a very common type of attack,...
Space Fence, currently under construction on Kwajalein Atoll, will revolutionize Space Situational Awareness (SSA) using advanced phased array radar technology in two of the largest phased arrays to ever be constructed. Space Fence will provide catalog completeness, accuracy and timeliness with vastly improved performance in Low Earth Orbit (LEO) and capability to support missions in Geosynchronous...
Digital receivers are an important component of phased array radars. This is due in part to the fact that they can allow for multiple simultaneous receive beams and useful modes of radar operation. Their development is normally restricted to detailed engineering activities with specifications flow-down from system level requirements. While this method is the normal approach to subsystem and component...
This paper is given in tutorial form using a simple explanation starting from basics of phased arrays and how they work. Physical insight into MIMO is then given. No heavy math used. It has been shown in the literature that MIMO thin/full array radars can provide orders of magnitude better resolution and accuracy than conventional radars. The thin/full array consisted of two collocated parallel linear...
A surveillance systems based on passive radar technique with distributed node has several advantages compared to traditional monostatic radar systems. For instance, a target will be illuminated and observed from different aspects angles. This improves the detection performance and the range/Doppler estimation. A distributed network topology of the surveillance system allows to increase the number...
We propose an online blind deconvolution approach to sequential through-the-wall-radar-imaging (TWI) where the received signal is contaminated by front wall ringing artifacts. The sequential measurements correspond to individual transmitter-receiver pairs where the front wall ringing induces a multipath kernel that corrupts the received target reflections. The convolution kernels may vary across sequential...
In this paper we consider the classical problem of blind deconvolution of multiple signals from its superposition, also called blind demixing and deconvolution. One is given a signal ∑ri=1 wi ∗ xi = y ∊ RL which is the superposition of r unknown source signals {xi}ri=1 and convolution kernels {wi}ri=1 The goal is to reconstruct the vectors w; and x;, which are elements of known but random subspaces...
In the paper, a non-contact vibration retrieval method was presented and the performance was analyzed based on linear frequency modulation continuous wave (LFMCW) radar. Firstly, the backscattered signal model of a vibrational target was introduced with the stop-go assumption. Then a vibration retrieval method was proposed by extracting phase based on the backscattered signal model of a vibrational...
We optimize the jamming signal for disrupting the operation of a MIMO radar system in order to understand the threat jamming poses to such systems. The jamming signal optimization is formulated as a minimax problem minimizing the maximum SINR that the receivers can achieve, resulting in a semidefinite program for a Toeplitz jamming covariance matrix or a second-order cone program for a circulant approximation...
In this paper, a double V-chirp waveform scheme is employed to suppress the false targets present in the delay-Doppler maps, which are caused by the use of traditional V-chirp transmitted signal in multiple targets environment. Then a family of nonlinear processing methods are applied and the delay-Doppler resolutions of these two waveform schemes are also compared, proving that the proposed waveform...
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.