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.
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Showing 1 to 20 of 74 for “"Ground Station"”.
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Distributed Ground Station Network for CubeSat Communications
… as well as the trend to build one control station per cubesat, result in a bottle neck effect whereby existing communications methods are no longer sufficient to support the increasing data volumes of the spacecraft. This Masters Thesis work explores the concept of deploying a network of …
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GUCCI: Ground station Uplink Command and Control Interpreter
… (LAICE) CubeSat to ensure best results. The ground station up-link software is created with this aim in mind. This will make the operation center for the LAICE project efficient. This will also help in evaluating the effect of a particular schedule on LAICE instrument interface board (LIIB) …
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Low cost and portable software defined radio ground station
… as to why this is evident is because traditional ground stations, which are largely hardware dependent, are expensive to develop. However, with the introduction of Software Defined Radios (SDRs) many of the operations formerly done using hardware can now be implemented in software. Using a SDR can …
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The HETE-II primary ground station system and electronics
Ground stations are crucial elements in the success of a satellite mission. With the shift in spacecraft design to provide increased autonomy, the ground station design will also undergo a similar paradigm shift. This thesis describes one such ground station design, which supports the HETE-II (High …
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A Distributed Software Framework for the Virginia Tech Ground Station
The key goal in this work is to enable a flexible ground station that is not constrained to a particular mission or set of hardware. In addition, with the concepts and software produced in this thesis, it will play a significant role in educating engineers and students by providing critical …
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Satellite Scatterometers: Calibration Using a Ground Station and Statistical Measurement Theory
… applications. First, the use of a calibration ground station is considered. A new methodology is established for calibration of SeaWinds, NASA's current scatterometer, using a receive-only ground station. Principles of the methodology are implemented, new analysis techniques developed, and …
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DESIGN OF AN OPTICAL GROUND STATION FOR SPACE-BASED QUANTUM KEY DISTRIBUTION
… with acceptable link loss. Meanwhile, on the ground, a network of optical ground station (OGS) is necessary to support quantum satellite missions. The optical receivers are required to maximise the collection of photons that are sent down to generate secret keys for encryption. Hence, there is …
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Design and Performance Analysis of an Aeronautical Routing Protocol with Ground Station Updates
… modes depending on the mission requirements. Ground station (GS) update mode is an AeroRP mode in which the GS sends geolocation or topology updates to improve routing accuracy. The main contribution of this thesis is to develop and implement the GS updates in AeroRP and analyse its …
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Frequency Estimation of Linear FM Scatterometer Pulses Received by the SeaWinds Calibration Ground Station
The SeaWinds Calibration Ground Station (CGS) is a passive ground station used to receive and sample transmissions from the SeaWinds scatterometer. During post processing, the received transmissions are characterized in order to verify proper instrument operation and to eliminate error in satellite …
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A detailed analysis of the helical array as a high performance portable ground station antenna
… satellite operations often require a portable ground station capability. However, the traditional large parabolic dish solidly mounted in concrete is not conducive to portable operation. This work offers the helical array as a viable alternative. A critical literature survey shows what work has …
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Balloon Borne GPS-Enabled Radiosondes That Enable Simultaneous Multi-Point Atmospheric Sensing With a Single Ground Station
… track multiple sondes with a single ground station. Sensors to measure temperature and pressure were added to improve measurements of the atmospheric state. A printed circuit board shield and 3D-printed shell were designed to make mass manufacturing possible. A thermistor-based …
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Ground Station Mixed-Signal PCB and SFP Ethernet-to-Optical Connector for the Deployable Optical Receiver Aperture (DORA) CubeSat
… in the corresponding direction. The DORA optical ground terminal (OGT) will be stationed on the ground to communicate with the DORA CubeSat in flight. This thesis project will address the ground station analog and digital electronics and data transfer needed to deliver data received from the DORA …
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MACHINE LEARNING IN MOBILE CUBESAT COMMAND AND CONTROL (MC3) GROUND STATIONS
The Mobile CubeSat Command and Control (MC3) ground station network is a program designed to enable many organizations to command and control very small satellites (or CubeSats) in low-earth orbit. The MC3 network currently consists of ground stations that are geographically dispersed and utilize …
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Portable optical ground stations for satellite communication
… is required from both the space terminal and the ground station. While existing lasercom ground stations have primarily utilized professional telescopes at observatory-class facilities, making optical ground stations more affordable and transportable is a key enabler for expanding lasercom to …
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RadioSTAR (Radio Spacecraft for Telecommunications Assessment and Risk-reduction): A 3U CubeSat for validation of ground stations and link budgets
… in orbit increases, an increasing number of ground stations must be constructed, recommissioned, or updated in order to provide uplink and downlink access. However, prior to deployment of a spacecraft, it is difficult to evaluate a ground station’s performance capabilities. Over-the-air …
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Scenario-based uncertainty quantification for deep space optical communications
… designs. Five architectures, including arrayed ground stations, a relay at the Earth-Sun L4 Lagrange point, and a space-based receiver array in Earth orbit, are evaluated using data rate, availability, data volume, and cost proxy as figures of merit. A statistical model for data rate is …
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Hardware integration of parachute guidance, navigation, and control for the Affordable Guided Airdrop System (AGAS)
… analyze and improve the simulation model. A ground station utilizing the modelƦs control algorithms, a downlink of platform position and attitude data, and a FutabaR Pulse Code Modulated uplink demonstrated controlled guidance of a round cargo parachute (G-12). This system evolved as an …
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Cooperative human-robot search in a partially-known environment using multiple UAVs
… a live video from its front-facing camera to a ground station over a wireless network. The human operator views the video on the ground station, and uses it to locate the target object, culminating the mission.
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Efficient spectrum-handoff schemes for cognitive radio networks
… networks pose interference risks to mobile ground stations; while inter-satellite links can interfere with terrestrial radio astronomy observations. Terrestrial wireless networks, commercial earth observations and terrestrial radio astronomy observations also require mechanisms that will …
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FPGA-aided MAV vision-based estimation
… estimation for systems that are deployed on the ground, have various sensors, as well as multiple cameras, a current challenge consists of deploying minimalistic systems suited specifically for MAVs. This thesis presents a novel approach for six-degrees of freedom motion estimation using a …
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