International Telemetering Conference Proceedings / November 04-07, 1991 / Riviera Hotel and Convention Center, Las Vegas, Nevada / A digital device for rapid acquisition of the initial phase of PN code has been implemented. The principles and results of the experiment are introduced in this paper. The m PN code is modulated on IF with BPSK type. The cycle of PN code P=255 chips. The rate of PN code R=5.1 × 10 chips /s. The IF is not acquired. The shift in Doppler 6 frequency f is within l-4KHz. In these conditions, the phase of PN code can be acquired d within 3 ms and the error of sychronization is less than 0.5 chip.

International Telemetering Conference Proceedings / October 27-30, 1997 / Riviera Hotel and Convention Center, Las Vegas, Nevada / Caterpillar Inc. has been testing construction and mining equipment using Computerized Analysis Vans for two decades. During our latest van upgrade, we chose to move to PCM/FM from FM/FM mainly to increase the channel count. We also replaced our old signal conditioning that used span and balance potentiometers with computer programmable signal conditioning. This new signal conditioning requires that the gain and balance point be calculated for every channel on each test. The formulas for these calculations depend on the sensor, the signal conditioning card used, and the test requirements. Due to the number and variety of machines tested at the Caterpillar Proving Grounds, these calculations needed to be automated. Using a few initial parameters and the information from our sensor calibration database, each channel’s balance point, gain, and expected slope are calculated. This system has increased productivity, accuracy, and consistency over manually calculating these parameters. This paper covers the sensor database, the calculated parameters and an overview of the way the system works.

ITC/USA 2005 Conference Proceedings / The Forty-First Annual International Telemetering Conference and Technical Exhibition / October 24-27, 2005 / Riviera Hotel & Convention Center, Las Vegas, Nevada / In GPS receiver the acquisition process generates two important parameters: the initial carrier frequency and the initial phase of the C/A code. In this paper two different methods for acquisition are mainly discussed: serial search in the time domain and FFT search in the frequency domain. Frequency domain acquisition involves using the Fast Fourier Transform (FFT) to convert the GPS signals into the frequency domain. One fast and easy-to-implement algorithm for averaging correlation is implemented and explained in detail. The FFT search method is both simulated in Matlab and evaluated in Altera Stratix DSP development board.

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Electrical and Electronic Engineering / Master / Master of Philosophy

During software development various forms of software documentation can be produced to make the software easier to understand and maintain after the software have been developed. One of these forms of software documentation is code comments, which is a form of software documentation that is produced to make source code easier to read and maintain. Although code comments make the code easier to read and maintain, code comments can become outdated and inconsistent with their corresponding code. Outdated and inconsistent code comments increase the probability for future bugs and when these comments are encountered, developers could lose the confidence for all other comments. In order to reduce the amount of outdated and inconsistent code comments, a program named the comment validator is presented in this study. The comment validator provides developers with the opportunity to manually validate code comments by segmenting code into three segments of code that needs to be manually validated: classes, methods and properties. The comment validator identifies when code segments have been modified after validation, therefore indicating that the code segments corresponding code comments could be outdated and inconsistent. The comment validator were evaluated through functional testing and through a field study in order to test that the comment validator could reduce the amount of outdated and inconsistent code comments. The evaluation showed that the comment validator did remove outdated and inconsistent code comments when it were used according to the description presented in this study, therefore providing a new way to reduce the amount of outdated and inconsistent code comments in software development projects.

This study examines the language situation in the media discourse on The Opposite Direction, al-Jazeera’s flagship talk show hosted by Faisal al-Qasim. It investigates the phenomenon of code-switching between Standard Arabic and different spoken vernaculars during the talk exchange. Theories of code-switching proposed by Gumperz, Giles, and Myers-Scotton et al. are introduced after the history of Arabic discourse analysis is briefly discussed. In order to explain under what conditions code-switching happens, I choose to observe and analyze instances of code-switching in four episodes of the program, focusing on the communicative functions and motivations for language choice. The applicability of relevant theories is examined to find the theories that best account for speakers’ engaging in code-switching in the pan-Arab media discourse. / text

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