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Advisor: Dr. Steven Reising • Elliot Buller • Luke Ciavonne • Mehdi Mehrpartou • Passive microwave measurement device • Measures black body radiation • Tuned to resonant frequency of water vapor (22.235 GHz) • Extremely sensitive to changes in water vapor • Can detect water vapor through cloud cover • Forecasting weather •Measuring sea surface temperature •Cloud cover •Precipitation rate • Predicting larger regional and global trends • Study of atmosphere and surfaces of planets • Embedded Intel SBC running Windows 98 • Off the shelf boards for data acquisition • Custom power conditioning circuit • Limitations • Prone to failure • Power requirements • Heat produced • Low power consumption (<3 Watts) • Small Size • Reliable • Low latency interrupt response • Sufficient I/O ports (3 Serial ports, 16 A/D channels) • Two board solution: • Custom designed 4 layer PC104 daughter card designed by Pat Kusbel • ARM9 based commercial single board computer • Boards communicate over PC104 bus Device Power (prev) Power (new) Computing System 6.9 W 1.8 W Analog Board 5.6 W 0.5 W RF 2.5 W 2.5 W Total 15 W 4.5 W • 6 Switching Voltage Regulators • High Efficiency at High Currents ( > 90%) • 7 Linear Voltage Regulators • Low Noise (typically 30 μVrms, 10 Hz to 100 kHz) • Low Quiescent Current (30 μA) • Low Output to Input Ratio for Higher Efficiency • DC Voltage Levels • Output Voltage Ripple • Noise • Stability • Transient Response • Electromagnetic Interference (EMI) • Custom board digitizes 4 analog channels from Radiometer • ARM9 board initializes and controls custom board • Boards communicate with each other over PC104 bus • Custom board includes FPGA running Microblaze processor • Processor tasks include: •Periodically polling ADCs •Buffering samples on-board •Maintain local time-base •Control off-board power to radiometer • Processor clock is faster than PC104 clock • Provide temporary storage of data • Send periodic interrupt request to trigger data dump to ARM9 board • Receive control parameters from ARM9 board • Linux kernel module •Service Interrupts from FPGA • SD Card storage daemon •Shuttles data from device driver to SD cards • Temperature control software •Communicates with Peltier unit to control temp within 0.1˚C • Time management •Communicates with GPS to store and synchronize time on both boards • Hardware •Finish testing power supplies •Run transient analysis on DACs •Test all power supplies with dummy loads • Software •Write time management software to synchronize with GPS •Write Microblaze mini-kernel to interface to ADCs •Write software to control positioning apparatus •Write user interface to configure device and dump data Dr. Steven Reising Sharmila Padmanabhan Pat Kusbel • Flavio Iturbide-Sanchez • Olivera Notaros