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Efficient Harmonic Analysis Technique for Prediction of IGS Real Time Satellite Clock Corrections

Efficient Harmonic Analysis Technique for Prediction of IGS Real Time Satellite Clock Corrections

DOI: 10.4236/pos.2017.83003 38 Positioning real-time through the predicted part, the rapid precise ephemerides are available with latency about 17 - 41 Hours, and the final precise ephemerides is available with delay about 12 - 18 days [1]. IGS final products enable users to achieve centemeter-level accuracy if the IGS conventions are considered [2]. However, this accuracy is achievable only in post-processing rather than in real-time. The only precise product that available to users in real-time is the predicted part of the IGS ultra-rapid products (IGU). However, the accuracy which can be ob- tained using the predicted part is much less than that can be obtained from products derived from real measurements [3]. In 2001, the “Real-Time Working Group” (RTWG) was established by the IGS, in order to meet requirements of precise real-time applications, and defined the framework for “Real-Time Ser- vice” (RTS). In August 2011, the IGS RTS project started providing access to real-time satellite precise orbit and clock corrections in addition to raw GNSS data by streaming via internet. The IGS RTS is officially launched in April 1 st ,
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Simulation research of PEMFC gas starvation diagnosis based on wavelet analysis and harmonic theory

Simulation research of PEMFC gas starvation diagnosis based on wavelet analysis and harmonic theory

The principle of THDA technique using for PEMFC faults diagnosis is that: by adding small amplitude and fixed frequency signals, if the voltages vary in some cells for certain reasons, the output stack voltage will be corresponding warp and distortion, and then through a series analysis of out coming effects of the critical voltage drops, the faults can be accurately judged, and the action can be take. The advantage of this new approach is that: barely through the analysis of the real-time stack output voltage, whether the stack or even the single cell operates in a safe and reliable condition can be judged [12]. For instance, such as simulating the insufficient air supply in cathode, which is often happened in a fuel cell, the insufficient air inflow generates the decreased oxygen proportionally, leading to a high diffusion resistance in cathode, and thus caused a slightly drop of the voltage. By superposing an input disturbance, the PEMFC system will produce a certain harmonic distortion in the output. The harmonic distortion will be analyzed in frequency domain, and compared with the original superposition frequency, in order to achieve the purpose of faults diagnosis.
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Real time Analysis of Sensory Dissonance

Real time Analysis of Sensory Dissonance

Figures 3 and 4 plot the first three and a half minutes and four minutes respectively. The timings of the same section of the score differ due to different performance tempi. The periodic attacks of contrabass and trombone are visible as troughs in both of the roughness plots. The peaks in between correspond to tutti sustained chords which gradually evolve from harmonic at the opening (less rough) to inharmonic (more rough) to flickering string sonorities in the middle register (less rough). A second excerpt from the third to the sixth minute (figure 5) follows the opposite path, as dense brass and wind clusters and multiphonics in the low register (more rough) expand out into widely-spaced wind and string chords in the upper register (less rough). The motif of inhalation and exhala- tion, discussed by Grisey in his own analysis of the piece, is clearly visible in the roughness plots, as is the larger trend of increase and decrease in tension governing this section.
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AN ANALYSIS OF DISTRIBUTED REAL TIME SYSTEMS: AN OVERVIEW

AN ANALYSIS OF DISTRIBUTED REAL TIME SYSTEMS: AN OVERVIEW

Different distributed real-time systems (DRS) must handle aperiodic and periodic events under diverse sets of requirement. A real time distributed computing has heterogeneously networked computers to solve a single problem. So co-ordination of activities among computers is a complex task and deadlines make it more complex. The performance of the system depends on many factors such as traffic workloads data base system architecture, first configurable component middleware services for admission control and load balancing of aperiodic and periodic event handling, underlying processor, disk speeds, concurrency control, transaction management. Simulation study has to be performed to analyze the performance under different transaction scheduling, different workloads arrival rate priority policies, altering slack factors and preemptive policies.. The throughput of the system depends on the arrival rate of transaction. The performance can be enhanced by adaptively minimizing the slack factor.
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Real Time Analysis of Pollutants inVehicles [R.T.A.P.V]

Real Time Analysis of Pollutants inVehicles [R.T.A.P.V]

Esp8266 Wi-Fi module also helps us determine the location of the person through the help of the geo- location API. In order to get the geo-location API, a person needs to get a key from the Google API to use the geo-location API. The key provides us the access to know the location of the given module we have attached to the gadget, i.e., the esp8266 module. What it actually does is send the location of the device connected to the internet and providing Wi-Fi to the module. The API gives us the latitude as well as longitude thus providing accurate location of the module. Hence, the gadget is able to perform spatio-temporal analysis of pollutants in vehicles.
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Analysis of Emotions in Real-time Twitter Streams

Analysis of Emotions in Real-time Twitter Streams

The purpose of this paper is to present EmoTwitter 2.0, a system for visualizing discussions and emotions of Twitter users in real time over a specific geographical location. The system, given location information as input, streams users’ tweets posted in real time using the Twitter API. In addition, using content analysis, it extracts and visualizes the most frequent words and emotional content of the streamed tweets. Through demonstrations of potential use cases and testing, the system has shown to have practical applicability. It provides an opportunity to easily visualize and compare the discussions of people on Twitter in certain geographical locations, which can be useful, for instance, in targeted messaging.
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An Experiment in Design and Analysis of Real-Time Applications

An Experiment in Design and Analysis of Real-Time Applications

In the problem part algorithmic elements of the application are presented independently of the hardware. Problem part can be directly gen- erated from LACATRE notation. By using ob- ject representation of all real time elements, this translation can be simple and straightforward. Worst-case execution time analysis is performed in two phases. In the first phase, structure of the program by means of blocks, loops, decisions, etc., is identified. Then for all linear parts of the code maximal execution time is estimated. Similar to the code generation, execution time analysis is highly dependent on the micropro- cessor used. Because of this, basic execution time analysis should be integrated within a low- level code generator. Thus, in ObjectPEARL compiler each object for code generation also has a corresponding method for execution time estimation. High-level temporal analysis is per-
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A Framework for Real-Time Twitter Data Analysis

A Framework for Real-Time Twitter Data Analysis

Polarity analysis is classifying the polarity of a, a sentence or an entity feature/aspect is positive, negative, or neutral. Screenshot of projecting the Polarity Analysis is as shown in. Polarity analysis for the Facebook data retrieved by using the hash tags mentioned in the section 3.3.2.1.7 is writer. Sentiment Analysis works based on the identified emotions such as "angry", "sad", and "happy". A basic task in sentiment analysis is classifying the polarity of a given text at the document and sentence. Screenshot of projecting the Sentiment Analysis.
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Modelling and analysis of real-time coordination patterns

Modelling and analysis of real-time coordination patterns

The formal model of Timed Automata, presented in Section 2.2, has first been introduced in [AD94] (and later in [Alu99]), and—as has been outlined in Sec- tion 2.2.4—has been studied, modified and extended intensively since that time. The Definitions and results in Section 2.2 have not been developed by us, but are entirely based on previous work on this field, which we have made clear by providing pointers to corresponding fundamental literature all throughout the Section. The nonetheless in-depth character of Section 2.2 is owed to the facts that there exist so many variants of TA (with sometimes only minor differences) that it is impossible to use the notion of the Timed Automaton without further explanations, and that the time-related notions (guards, invariants, update maps) directly carry over to TCA and TNA. Section 2.2 thus serves the purpose to make clear which notions and concepts of TA we use in this thesis, and to establish the concepts for handling of real-time. Moreover, it serves as the formal basis for the formula representation and SAT-based verification of TA introduced in the next Chapter.
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Dynamic Harmonic Analysis of Long Term over Voltages Based on Time Varying Fourier series in Extended Harmonic Domain

Dynamic Harmonic Analysis of Long Term over Voltages Based on Time Varying Fourier series in Extended Harmonic Domain

Harmonics have become an important issue in modern power systems. The widespread penetration of non-linear loads to emerging power systems has turned power quality analysis into an important operation issue under both steady state and transient conditions. This paper employs an Extended Harmonic Domain (EHD) based framework for dynamic analysis of long term analysis over voltages during the transients caused by inrush currents while large power factor capacitors are located at transformer secondary side. In such cases, a combination of capacitor and inductive system impedance may lead to parallel resonance circuits of high impedance. As a significance of the developed method, it is fully frequency domain dependent solution technique which uses time dependent Fourier series, orthogonal bases and matrix operators as addressed in EHD. The proposed method has been successfully tested on several networks and the obtained results are compared to those of a time-domain software, followed by discussion on results.
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Aspects of real time digital spectral analysis

Aspects of real time digital spectral analysis

University of Warwick institutional repository: http://go.warwick.ac.uk/wrap A Thesis Submitted for the Degree of PhD at the University of Warwick http://go.warwick.ac.uk/wrap/57021 This[r]

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Analysis of Reliability of Real Time Surveillance System

Analysis of Reliability of Real Time Surveillance System

Abstract. Reliability of real time surveillance system was analyzed and computed. The system tree was constructed. The relations between fault ratio and temperature of subassembly and element were also calculated. And their reliability was predicted and estimated. From the analysis, improvement methods were presented to optimize and consummate the real time surveillance system.

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A Framework for Real-time Analysis in OLAP Systems

A Framework for Real-time Analysis in OLAP Systems

Phase 1 is carried out independently on each backend node without requiring the PSI layer. At the end of the phase 1, each backend node has a local result set that is ready to be merged with the result sets of the other nodes. A careful examination of algorithm 9 shows that both the compressed index file as well as the compressed view file are read from file one block at a time. For large files, especially compressed view files, this translates to a large number of I/O calls. A second characteristic of this algorithm is that I/O calls to read from the index file are overlapped with the I/O calls to read from the view file. Alternatively reading from the index file and view file forces the disk to seek constantly. Furthermore, both the decompressIndexBlock and decompressDataBlock procedures take place in memory and each compressed block can be decompressed independently from the other blocks.
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Discontinuous Galerkin Finite Element Methods for the
time harmonic Maxwell equations in periodic media

Discontinuous Galerkin Finite Element Methods for the time harmonic Maxwell equations in periodic media

Now that it is known how to use discontinuous Galerkin methods for the time-harmonic Maxwell problem in a cavity, we will continue to the goal of this project, namely how to approximate the magnetic field/eigenvalues in a periodic medium. Since the magnetic field is expanded in Bloch-modes, it will be beneficial to adapt the basis functions accordingly. This will be done in Section 4.1. After that, the IP-DG discretization will be derived in Section 4.2, followed by some details on how to implement that discretization in Section 4.3. Finally, in Section 4.4, some results will be given for the simplest case, namely an infinite homogeneous domain.
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The Continuous Wavelet Transform Associated with a Dunkl Type Operator on the Real Line

The Continuous Wavelet Transform Associated with a Dunkl Type Operator on the Real Line

for all f  E   R . The intertwining operator X has been exploited to initiate a quite new commutative harmonic analysis on the real line related to the differential-dif- ference operator Λ in which several analytic structures on R were generalized. A summary of this harmonic analysis is provided in Section 2. Through this paper, the classical theory of wavelets on R is extended to the dif- ferential-difference operator Λ. More explicitly, we call generalized wavelet each function g in 2  , 2 1 d 

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Equivalence of K Functionals and Modulus of Smoothness Generated by a Generalized Dunkl Operator on the Real Line

Equivalence of K Functionals and Modulus of Smoothness Generated by a Generalized Dunkl Operator on the Real Line

The authors have developed in [7] [8] a new harmonic analysis on the real line related to the differential-dif- ference operator Λ in which several classical analytic structures such as the Fourier transform, the translation operators, the convolution product, ..., were generalized. With the help of the translation operators tied to Λ , we construct in this paper generalized modulus of smoothness in the Hilbert space L 2 (  , x 2 α + 1 dx ) . Next, we

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Harmonic analysis of CFL and incandescent lamp

Harmonic analysis of CFL and incandescent lamp

current waveform, from a input sinusoidal voltage source. In order to show the undesirable effects and adversity of these non-sinusoidal signals, harmonic definition was introduced by Institute of Electrical and Electronics Engineers (IEEE) in 1981 which can be defined as the sum of the sinusoidal signals in different frequencies by Fourier series. According to IEEE Standard 519 (IEEE Std. 519-1981) reported in 1981, Harmonic is defined as “A sinusoidal component of a periodic wave which consists of a frequency that is an integer m of the fundamental frequency”. The abundance usage
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Time Frequency Analysis of Higher Harmonic Generation in a Three Color Laser Pulse

Time Frequency Analysis of Higher Harmonic Generation in a Three Color Laser Pulse

Figure 6 shows spectral profile and time profile of HHG in zones (a) and (c) respectively. Zone (b) shows time frequency analysis of HHG. The power spectrum of high order harmonics is computed by Eq. 8 and is shown in Fig. 6-a. in this figure, one can clearly see that the power spectrum starts to get smoother from 80 th order up to 180 th order that is the cutoff of the power spectrum and corresponds to the peak of the time frequency distribution (in part (b)). The Gabor transformation of dipole acceleration that is given by Eq. 13 is depicted in zone b. it asserts that each frequency can occur on two different times. It means that electrons that take part in HHG process may pass two separated energy paths. In this work short path is more dominant. In the region that distribution of HHG is more dominant, emission takes place. By exploring time profile of HHG that is computed by Eq. 9 by filtering harmonics near cutoff region, and isolated 53 as pulse is generated. This pulse measures the width of the emitted photon. It is of principle to point that according to Fig. 2 ionization rate is maximum into time steps. The electrons that are ionized in Fig. 2 recombine in later times in Fig. 6-b. but the only emission that leads to generation of attosecond pulse is the one that emits between times 1.37-1.4. fluctuations of the intensity in Fig. 6-c shows the intensity of their corresponding emission in zone b. before, it was mentioned that  which is the width of WF plays an important role on the resolution of spectral and temporal components.
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Scheduling of Real- Time processes, strategies and analysis

Scheduling of Real- Time processes, strategies and analysis

– It may be useful to use round-robin scheduling in systems that execute the same application in more than one process. In this case, multiple tasks would be executing the same code, and it is possible that a task might not relinquish the CPU to a task of the same priority running in another process (running the same binary). Note that round-robin scheduling is global, and controls all tasks in the system (kernel and processes); it is not possible to implement round-robin scheduling for selected processes. Round-robin scheduling is enabled by calling kernelTimeSlice(ticks), which takes a parameter for a time slice, or interval. If ticks = 0 round-robin is disabled. This interval is the amount of time each task is allowed to run before
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Comparison Between Real-Time Polymerase Chain Reaction and DNA-Microarray in Detection and Identification of Mycobacterium Species

Comparison Between Real-Time Polymerase Chain Reaction and DNA-Microarray in Detection and Identification of Mycobacterium Species

With the recent global issue of mycobacterial infections, it is necessarily to find rapid, sensitive, and specific diagnostic methods for the detection and identification of M. tuberculosis and NTM in clinics (Bloom BR, Murray, CJL. 1992). The traditional diagnosis of mycobacterial infection is accomplished by a culture-based identification method. It is a time consuming due to its slow growth which usually takes 4 to 6 weeks or longer (Jeager H, 1967). Direct examination with microscope is faster but it lacks sensitivity and specificity. Rapid and sensitive diagnosis not only prevents of resistance and further spread of infections but also avoids unnecessary drug exposure (Griffith, DE, 2007)
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