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    Browsing by Department "Aerospace Engineering and Engineering Mechanics"

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    Now showing items 1-20 of 234

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      • Ablation onset in unsteady hypersonic flow about nose-tips with a forward-facing cavity 

        Silton, Sidra Idelle, 1973- (2001-08)
        A forward-facing cavity is examined as a means of reducing the severe heating and delaying ablation onset at the nose-tip of a hypersonic vehicle. Whereas previous studies have concentrated on heating rates alone, the ...
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        Accuracy Limits for Globally-Referenced Digital Mapping Using Standard GNSS 

        Narula, Lakshay; Murrian, Matthew J.; Humphreys, Todd E. (IEEE, 2018)
        Exchange of location and sensor data among connected and automated vehicles will demand accurate global referencing of the digital maps currently being developed to aid positioning for automated driving. This paper ...
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        Achieving the Cramer-Rao Lower Bound in GPS Time-of-Arrival Estimation: A Frequency Domain Weighted Least-Squares Estimator Approach 

        Wesson, Kyle; Humphreys, Todd E. (2013)
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        Adaptive Estimation of Signals of Opportunity 

        Kassas, Zaher M.; Ghadiok, Vaibhav (2014-04)
        To exploit unknown ambient radio frequency signals of opportunity (SOPs) for positioning and navigation, one must estimate their states along with a set of parameters that characterize the stability of their oscillators. ...
      • Adaptive interplanetary orbit determination 

        Crain, Timothy Price, 1973- (2000-08)
        This work documents the development of a real-time interplanetary orbit determination monitoring algorithm for detecting and identifying changes in the spacecraft dynamic and measurement environments. The algorithm may ...
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        Adaptive output feedback controllers for a class of nonlinear mechanical systems 

        Miwa, Hideaki (2002)
        Even from the early days of adaptive control theory, it has been a primary target for several researchers to guarantee global stability using as limited assumptions as possible. Currently, there exist applicable theories ...
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        Advanced navigation algorithms for precision landing 

        Zanetti, Renato, 1978- (2007-12)
        A detailed analysis of autonomous navigation algorithms to achieve autonomous precision landing is presented. The problem of integrated attitude determination and inertial navigation is solved. The theoretical results ...
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        Advances in GNSS Equipment 

        Humphreys, Todd E. (2010)
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        Analysis and order reduction of an autonomous lunar lander navigation system 

        Newman, Clark Patrick (2009-08)
        A navigation system for precision lunar descent and landing is presented and analyzed. The navigation algorithm is based upon the extended Kalman Filter and employs measurements from an inertial measurement unit to propagate ...
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        Analysis of Ionospheric Scintillations using Wideband GPS L1 C/A Signal Data 

        Humphreys, Todd E.; Ledvina, Brent M.; Psiaki, Mark L.; Kintner, Paul M. (2004)
        A non-real-time GPS receiver has been developed and tested for use in scintillation analysis. The receiver consists of a digital storage receiver and non-real-time software acquisition and tracking algorithms. The goal ...
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        Application of automatic differentiation to trajectory optimization via direct multiple shooting 

        Garza, David Marcelo (2003)
        Automatic differentiation, also called computational differentiation and algorithmic differentiation, is the process of computing the derivatives or Taylor series of functions from the computer source code implementing ...
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        Assessing the Spoofing Threat: Development of a Portable GPS Civilian Spoofer 

        Humphreys, Todd E.; Ledvina, Brent M.; Psiaki, Mark L.; O'Hanlon, Brady W.; Kintner, Paul M. (2008)
        A portable civilian GPS spoofer is implemented on a digital signal processor and used to characterize spoofing effects and develop defenses against civilian spoofing. This work is intended to equip GNSS users and receiver ...
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        Assured Navigation and Timing 

        Humphreys, Todd (2017-09-28)
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        Attitude dynamics stabilization with unknown delay in feedback control implementation 

        Chunodkar, Apurva Arvind (2009-12)
        This work addresses the problem of stabilizing attitude dynamics with an unknown delay in feedback. Two cases are considered: 1) constant time-delay 2) time-varying time-delay. This is to our best knowledge the first ...
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        Automated generation and optimization of ballistic lunar capture transfer trajectories 

        Griesemer, Paul Ricord (2009-08)
        The successful completion of the Hiten mission in 1991 provided real-world validation of a class of trajectories defined as ballistic lunar capture transfers. This class of transfers is often considered for missions to the ...
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        Automotive Collision Risk Estimation Under Cooperative Sensing 

        LaChapelle, Daniel; Humphreys, Todd; Narula, Lakshay; Iannucci, Peter; Moradi-Pari, Ehsan (IEEE, 2020)
        This paper offers a technique for estimating collision risk for automated ground vehicles engaged in cooperative sensing. The technique allows quantification of (i) risk reduced due to cooperation, and (ii) the increased ...
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        Automotive-Radar-Based 50-cm Urban Positioning 

        Narula, Lakshay; Iannucci, Peter A.; Humphreys, Todd E. (IEEE, 2020)
        Deployment of automated ground vehicles (AGVs) beyond the confines of sunny and dry climes will require sub-lane-level positioning techniques based on radio waves rather than near-visible-light radiation. Like human sight, ...
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        A Blueprint for Civil GPS Navigation Message Authentication 

        Kerns, Andrew J.; Wesson, Kyle D.; Humphreys, Todd E. (2014-05)
        A proposal for civil GPS navigation message authentication (NMA) is presented with sufficient specificity to enable near-term implementation. Although previous work established the practicality and efficacy of NMA for ...
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        CASES: A Novel Low-Cost Ground-based DualFrequency GPS Software Receiver and Space Weather Monitor 

        Crowley, Geoff; Bust, Gary S.; Reynolds, Adam; Azeem, Irfan; Wilder, Rick; O'Hanlon, Brady W.; Psiaki, Mark L.; Powell, Steven; Humphreys, Todd E.; Bhatti, Jahshan A. (2011)
        GPS receivers can be used for monitoring space weather events such as TEC variations and scintillation. This paper describes the new GPS sensor developed by ASTRA, Cornell and UT Austin. The receiver is called “Connected ...
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        CASES: A Smart, Compact GPS Software Receiver for Space Weather Monitoring 

        O'Hanlon, Brady W.; Psiaki, Mark L.; Powell, Steven; Bhatti, Jahshan A.; Humphreys, Todd E.; Crowley, Geoff; Bust, Gary S (2011)
        A real-time software-defined GPS receiver for the L1 C/A and L2C codes has been developed as a low-cost space weather instrument for monitoring ionospheric scintillation and total electron content. The so-called CASES ...

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        • facebook
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        • CONTACT US
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        Subscribe to our NewsletterGive to the Libraries

        © The University of Texas at Austin