Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 29 for “"distance estimation"”.
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Distance estimation through wavefront curvature in cellular systems
Thesis (S.B. and M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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The impact of background and context on car distance estimation
… well established that people underestimate the distance to objects depicted in virtual environments and two-dimensional (2D) displays. The reasons for the underestimation are still not fully understood. It is becoming more common to use virtual environment displays for driver training and …
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Accurate On-Body Distance Estimation using BLE RSSI and IMU Sensor Fusion
… Indicator (RSSI) for robust, short-range distance estimation on the human body remains a challenging area, primarily due to signal instability caused by multipath fading and body shadowing. This thesis presents a novel framework that fuses BLE RSSI with Inertial Measurement Unit (IMU) …
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Dynamic Braking Control for Accurate Train Braking Distance Estimation under Different Operating Conditions
… can accurately determine the train braking distance. One of the critical factors in Positive Train Control (PTC) is accurately estimating train braking distance under different operating conditions. Accurate estimation of the braking distance will allow trains to be spaced closer together, …
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Mass and Distance Estimation Simulations for the Nancy Grace Roman Space Telescope Using PyLIMASS and a Case Study on Intellectual Property Frameworks in Space Collaborations
… requirement, recovering the lens mass and distance in at least 40% of planetary events with better than 20% uncertainty, targeted simulations are essential. Using the pyLIMASS inference framework and Fisher matrix-based uncertainty propagation, I demonstrate that for the well-characterized …
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An analysis of perceptual errors in perspective displays
… The aim of this thesis was to develop a model of distance estimation errors in perspective displays. It was hypothesised that many of the perceptual errors observed in perspective displays, such as azimuth and inter-object distance estimation errors, were related to observers wrongly estimating …
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Adding direction to a directionless world
… antennas and previous work in RSSI based radio distance estimation, this work shows that using directional antennas alone, the angle between two devices can be approximated. Furthermore, this thesis shows the effect of distance estimation error on angle estimation and how the number of samples …
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Retrieval, action and the representation of distance in cognitive maps
… the influence of action on the representation of distance in cognitive maps. It is proposed that bias in distance estimation is a function of the contexts of retrieval that trigger the representation of action in memory during evaluation tasks. The proposal is consistent with embodied cognition …
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Frames of reference and electronic anchors: An investigation of map displays for helicopter flight
… for helicopter navigation. Results were mixed. Distance estimation, wayfinding, and the orientation component of the target location score were generally facilitated by the fixed map, while reorienting from an unfamiliar location was facilitated by the rotating map. Color anchors facilitated …
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Robust Efficient Estimation of Semiparametric Covariate Models based on Minimum Hellinger Distance
… models. For this purpose, we employ the minimum distance approach which in general is automatically robust with respect to the stability of the quantity being estimated. In particular, the minimum Hellinger distance estimation (MHDE) introduced by Beran (1977) for parametric models produces …
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Wideband processing and analysis of lightning in the earth-ionosphere waveguide
… cutoff region. Preliminary formulas for distance estimation have been developed from the simulations, based on slow tail separation time and spectral ratios. These methods are evaluated for consistency against real events.
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Statistical Inferences for Two-Component Semiparametric Location-Scale Mixture Models
… structures. Traditional methods of parameter estimation in mixture models, such as Maximum Likelihood Estimation (MLE), are widely used due to their desirable asymptotic properties such as asymptotic efficiency. However, MLE can be highly sensitive to model misspecification and the presence of …
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Locating Unmanned Aerial Vehicles (UAVs)
… tag. The method consists of two stages: distance and location estimation. We compared distance estimation using three different methods: Time of Arrival (ToA), counter, and Received Signal Strength Indication (RSSI). Long Range Wide Area Network (LoRaWAN) protocol is utilized in the …
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Analysis of bluetooth low energy beacons in indoor localization policy and application
… low setup cost method based off of existing RSSI distance estimation research. Bluetooth low energy beacons are explored as a cheap method to enable localization indoors by using the beacons to collect signal readings and create distance models empirically. Further techniques are discussed to …
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Categorical and coordinate visuospatial processing in younger and older adults
… judgements was found to be affected by the distance of the dot from the bar and by the visual field in which stimuli were presented. However, the inconsistent effects of visual field across experiments made interpretation of these findings difficult. Experiment 4 examined patterns of eye …
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Localizatation estimation usign the technique of multi-sequence positioning
… study is focusing on using a distribution-based estimation method. The reason for selecting this method because it is considered an energy saving effort comparing to costly centralized localization scheme. The scope of the estimation in localization of sensor nodes is a Multi-Sequence Positioning …
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Localization Of Sensors In Presence Of Fading And Mobility
… a sensor node determines its location from distance measurements to mobile anchors of known locations. We take into account the uncertainty and fluctuation of the RSS as a result of fading and take into account the decay of the RSS which is proportional to the transmitter-receiver distance …
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Designing Future Interactions for Situated Extended Reality Maps
… while Ring Maps aid in navigation, distance estimation, and spatial awareness. The findings of this thesis offer valuable insights for the development of XR map systems, particularly in applications that require spatial reasoning, navigation, and environmental awareness and open up …
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Behavioral measurements of visual processing in adult male and female hooded rats: Do visual tasks reflect sex differences in visual cortex morphology?
… male and female rats, given a checkerboard distance cue in a fixed or movable position, were trained to jump up to 40cm from one elevated platform to another. There was no difference in the landing accuracy or in the number or size of head bobs that were generated to produce motion parallax …
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