Organizational Unit:
Daniel Guggenheim School of Aerospace Engineering

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Now showing 1 - 2 of 2
  • Item
    Optimized communications protocol for low earth orbit cubesat
    (Georgia Institute of Technology, 2018-05) Desai, Baijun
    The purpose of this document is to describe and analyze the implementation of a communications protocol to transfer data between a CubeSat and ground station. The mission of the CubeSat is to track debris in low earth orbit (LEO). Data transfers to and from the satellite include images, telemetry, commands, and processed data. The communications channel operates on a half-duplex connection with a single linearly polarized half-wave UHF dipole attached to the CubeSat, and a circularly polarized Yagi-Uda antenna on the ground station. Data will pass through a Software Defined Radio (SDR) and on the ground station over packet radio. The challenges faced in designing the protocol include high packet loss, short and infrequent access times, high delay times, variable signal strength, and limited power. The designed protocol will be implemented and tested on the CubeSat. It is evaluated against other existing communications protocols for performance.
  • Item
    Mixing in compressible shear layers
    (Georgia Institute of Technology, 2016-07-18) Mohan, Ratheesvar
    Efficient fuel-air mixing is vital to supersonic combustion, which is the basis of supersonic combustion RAMjets, or SCRAMjets, the preferred method of combustion for hypersonic flight. This study investigates mixing in compressible shear layers and its dependence on convective Mach number. The primary stream is air at Mach 2.5 and the secondary stream is seeded with acetone. PLIF and Schlieren imaging techniques are used to quantify mixing. Reduction of data is still in progress; this thesis reviews literature on the topic, outlines the experimental method employed, presents preliminary Schlieren results and presents the raw data obtained. Additionally, mass flow rates of both streams are calculated. It was determined that the experiments are highly repeatable, evidenced by the low standard deviations of the mass flow rates during runs.