Total Mission Concept
Ground System Process Control
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AbstractEmbedded parallel processing provides unique advantages over sequential and symmetrical processing architectures. During the past decade, the architecture of ground control systems has evolved from utilizing sequential embedded processors to modular parallel, distributed, and/or symmetrical processing. The concept of utilizing embedded parallel processing exhibits key features such as modularity, flexibility, scalability, host independence, non-contention of host resources, and no requirement for an operating system. These key features provide the performance, reliability and efficiency while at the same time lowering costs. Proper utilization of embedded parallel processing on a host computer can provide fault tolerance and can greatly reduce the costs and the requirement of utilizing high-end workstations to perform the same level of real-time processing and computationally intensive tasks.
SponsorsInternational Foundation for Telemetering
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DSP BASED SIGNAL PROCESSING UNIT FOR REAL TIME PROCESSING OF VIBRATION AND ACOUSTIC SIGNALS OF SATELLITE LAUNCH VEHICLEST.N., Santhosh Kumar; A.K., Abdul Samad; K.M., Sarojini; Indian Space Research Organisation (International Foundation for Telemetering, 1995-11)Measurement of vibration and acoustic signals at various locations in the launch vehicle is important to establish the vibration and acoustic environment encountered by the launch vehicle during flight. The vibration and acoustic signals are wideband and require very large telemetry bandwidth if directly transmitted to ground. The DSP based Signal Processing Unit is designed to measure and analyse acoustic and vibration signals onboard the launch vehicle and transmit the computed spectrum to ground through centralised baseband telemetry system. The analysis techniques employed are power spectral density (PSD) computations using Fast Fourier Transform (FFT) and 1/3rd octave analysis using digital Infinite Impulse Response (IIR) filters. The programmability of all analysis parameters is achieved using EEPROM. This paper discusses the details of measurement and analysis techniques, design philosophy, tools used and implementation schemes. The paper also presents the performance results of flight models.
Evaluation of the Feasibility of the Algae Cultivation-Extraction-Digestion-Recultivation Process to Recycle Nutrients and Determine the Nitrogen Balances and Impacts in the ProcessOgden, Kimberly; Zhang, Bingcong; Field, James; Sierra, Reyes (The University of Arizona., 2018)Nutrient supply is one of the critical obstacles limiting algal biofuel industrialization. It has been demonstrated that anaerobic digestion is an effective method to release nitrogen and phosphorus from algal biomass, but the nutrient recycle system of cultivation-extraction-digestion-recultivation has not been completely evaluated. In this dissertation, algae were cultivated on nutrients released from anaerobic digestion of lipid extracted algae. Algae recovery was calculated to demonstrate the feasibility of the nutrient recycle process. The quality of recultivated algae for algal biofuel was validated and the limiting nutrient was analyzed. Initial nitrogen concentration was shown to have significant impact on the entire process including algae and lipid productivity, as well as lipid and nitrogen content of the biomass. The nitrogen balance for each step of the entire process was closed within experimental error. Total nitrogen recoveries throughout the whole process were all approximately 65% regardless of the different initial nitrogen concentration. The biggest nitrogen losses occurred in lipid extraction and algae cultivation steps. The work described in this dissertation demonstrates the effectiveness of this nutrient recycle system, and therefore provides a promising method to significantly lower nutrient cost for algal biofuel production. Nitrogen analysis validates the experimental and analytical methods in this dissertation and provides points of future work to further optimize this recycle process.