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The problem of identifying dynamical models on the basis of measurement data is usually considered in a classical open-loop or closed-loop setting. In this paper this problem is generalized to linear dynamical systems that operate in a complex interconnection structure and the dynamical relationships between the measured variables signals need to be identified. It is shown that the classical Direct...
Handling delays and uncertain parameters in control systems is difficult and of long-standing interest. In this paper, we consider the problem of stabilizing any single-input single-output (SISO) linear time invariant (LTI) controllable/observable plant with an arbitrarily large uncertain gain and time delay; to do so, we propose a non-linear time varying (NLTV) controller. Despite being NLTV, the...
Delay cost functions that quantify the cost of delay to airlines are essential to air traffic management research. Seventeen delay cost functions from previous research are evaluated with airline actions in Airspace Flow Programs. Airlines are assumed to solve a minimum cost perfect matching problem when matching flights to slots. Unobserved aspects of airline costs are accounted for by adding a noise...
This paper investigates the problem of mean-square asymptotic stability of uncertain neural networks with time-varying delay and stochastic noise. Based on generalized Finsler lemma and the linear matrix inequality (LMI) optimization technique, an improved delay-dependent stability criterion is developed. It is shown that the new stability criterion is less conservative and less computationally complex...
In this study, online identification of state delays is discussed. First, a novel adaptive time delay identification technique is proposed for general classes of autonomous nonlinear systems subject to state delays. As an extension, this technique is modified to design a tracking controller for general classes of nonlinear systems subject to state delays. The main novelty of this controller is that...
The Double Estimation Technique (DET) is a GNSS signal-tracking concept. DET has the capability to produce reliable unambiguous, full-precision delay estimates from the Binary Offset Carrier (BOC) signals which have been adopted by the modernized and new GNSS, including the European Galileo constellation. DET is robust, being able to function under conditions of low C/N0, strong multipath and filtering...
Pre-correlation differential detection (PDD) scheme is studied for global navigation satellite systems (GNSS) receiver design. By performing a differential detection at the chip or sample level before correlation process, the effect of both data and residual carrier is eliminated which in turn allows for frequency independent code phase acquisition. Hence the search space and computational complexity...
Dynamic logic style is used in high performance circuit design because of its fast speed and less transistors requirement as compared to CMOS logic style. But it is not widely accepted for all types of circuit implementations due to its less noise tolerance and charge sharing problems. A small noise at the input of the dynamic logic can change the desired output. Domino logic uses one static CMOS...
This paper presents results of statistical analysis of RTN in highly scaled HKMG FETs. A robust algorithm to extract multiple-trap RTN is proposed and applied to show that RTN can cause serious variation even when HKMG and undoped channel are introduced. We further focus on hysteretic behavior caused by RTN with time constants much longer than the circuit timescale. This reveals that RTN also induces...
This work considers the problem of quickest detection of signals in a system of 2 sensors coupled by a negatively correlated noise, which receive continuous sequential observations from the environment. It is assumed that the signals are time invariant and with equal strength, but that their onset times may differ from sensor to sensor. The objective is the optimal detection of the first time at which...
The next generation of Global Navigation Satellite Systems (GNSS) are implementing Binary Offset Carrier (BOC) modulation. These signals were expected to provide not only better precision in the estimation of the signal's delay and phase but also more robustness to multipath effects. The advantage of BOC signals is that the main lobe of the correlation is very narrow although they present side lobes...
Conventional edge triggered flip-flops sample a data signal synchronizing with single clock edge. If a noise signal occurs around the clock edge, flip-flops result in malfunction. Then, we have proposed dual edge triggered flip-flops to solve this problem. The flip-flop has highly ability to prevent sampling a noise signal on a data line because it samples the data signal synchronizing with both of...
This paper presents a novel method to improve the performance of sub-threshold (sub-VT) gates in 65-nm CMOS technology. Faster transistors with a lower threshold voltage are introduced in the weaker network of a gate. It is shown that the employed method significantly enhances the reliability and performance of the gate, with an additive advantage of a lower area cost compared to traditional transistor...
In this paper we consider the issue of localization in the context of underwater sensor networks which contain anchor nodes with perfect knowledge of their position, but asynchronous clocks. By taking advantage of a sequential broadcasting protocol the entire network can be localized simultaneously with minimal overhead. Additionally, it can be initiated by any node at any time. Through extensive...
This paper presents a new type observer design by using only the sampled delayed measurements where the delay value is different of the sampling period. This proposed piecewise continuous observer, called Piecewise Continuous Systems and derived by using the theory of a particular hybrid systems characterized by autonomous switchings and controlled impulses, has a very simple structure and can be...
In this paper, in order to reduce discretization errors of dynamics with variable structures (VS), we propose an improved digital integrator. Use of Richardson extrapolation (RE) and fractional delay (FD) can improve Euler integrator, so we can obtain an improved integrator. However, Euler integrator using RE and FD directly has an infinite gain at a Nyquist frequency, and it is unsuitable for integrations...
Scale Time Offset Robust Modulation (STORM) is a waveform design technique involving the simultaneous transmission of a base waveform as well as a time-scaled and time-delayed copy of that waveform. For some applications this technique is attractive as a possible candidate to enhance synchronization performance, due to the different tradeoffs of its performance properties. This paper first presents...
Satellite based coherent beacon systems have been used for ionospheric studies by measurement of the differential phase between the carriers. A simulation study of such a system is presented in this paper, along with the differences in performance occurring by using a spread spectrum beacon over this conventional one.Usage of spread spectrum has the desirable properties of exhibiting a narrowband...
Sophisticated voice source estimation techniques, such as closed-phase pitch synchronous inverse filtering method, relay on accurate estimates of glottal closure instants (GCIs). In this paper, a group delay approach to GCI estimation is presented. Specifically, the average group delay and the energy weighted group delay measures are discussed in detail. We propose an improvement to the implementation...
Mobile ad hoc networks (MANETs) are notoriously difficult to defend against attack. In this paper we demonstrate that by optimizing a previously reported covert timing channel, it is possible to simultaneously improve the reliability of the channel and create a metric that reliably detects attacks. Using standard methods from information theory, we compute the capacity of the covert channel and show...
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