1. THEMIS/GBO Engineering Peer Review 1 UCB, Oct. 17, 2003 GROUND MAGNETOMETER GBO DESIGN

2. THEMIS/GBO Engineering Peer Review 2 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Sub-System Features GPS Receiver  Antenna and Electronics Integrated into one package  May be located >30M from host (RS232 signals)  NTP compatible (<1msec time accuracy) Flxugate Magnetometer  ±72KnT dynamic range @ 0.03nT Resolution (~22 bits)  Offset DAC system for 72 4KnT ranges per axis  2 Vectors per second data rate  Low Power < 2W  Small Size 22cm x 13cm x 5cm  Ruggedized All Weather Sensor Design  USB interface for data retrieval and firmware upload

3. THEMIS/GBO Engineering Peer Review 3 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design GPS Receiver Block Diagram GBO Magnetometer To Fluxgate Sensor Antenna Heater To Power Supply Power Control RS232 bidirectional Survival Heater and Thermistor GPS Power RS232 bidirectional USB Interface GBO Data System GPS Receiver Up to 30M cable length Up to 50M cable length 12VDC

4. THEMIS/GBO Engineering Peer Review 4 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design FEEDBACK UCLA Sigma-Delta Fluxgate Magnetometer MAG CLOCKS MAG CLOCKS SHIFT & INTERNAL LOGIC CLOCKS SHIFT & INTERNAL LOGIC CLOCKS FEEDBACK LATCH FEEDBACK LATCH DATA FORMATING & OUTPUT REGISTERS DATA FORMATING & OUTPUT REGISTERS DIGITAL NOISE SHAPING FILTER DIGITAL NOISE SHAPING FILTER XILINX XC2S50 DRIVE CIRCUIT DRIVE CIRCUIT SYNC. Demodulator SYNC. Demodulator 3 AXIS SENSOR ASSEMBLY 3 AXIS SENSOR ASSEMBLY INTEGRATOR SYNC. Demodulator SYNC. Demodulator INTEGRATOR SYNC. Demodulator SYNC. Demodulator INTEGRATOR SYSTEM CLOCK Offset DAC Offset DAC Offset DAC Offset DAC Offset DAC Offset DAC OFFSET DAC OUTPUT REGISTERS OFFSET DAC OUTPUT REGISTERS Sensor Heater Sensor Heater Electronics Heater Electronics Heater

5. THEMIS/GBO Engineering Peer Review 5 UCB, Oct. 17, 2003 x dt Integrator 1  Comparator 1-bit DAC x dt Integrator 2  FPGA Digital Decimation Filter 21-bits x(n) x(t) y(t) -- Fs:fs 32:1 Fs y(n)  Fluxgate Sensor AC Coupling Input Amplifier Synch demodulator x dt Integrator Band-Pass Filter Feedback Resistor Analog-to-Digital Converter ADC 16-24 bits Second Order Sigma-Delta Modulator Ground Magnetometer – GBO Design

6. THEMIS/GBO Engineering Peer Review 6 UCB, Oct. 17, 2003  Fluxgate Sensor AC Coupling Input Amplifier Synch demodulator x dt Integrator 1  x dt Integrator 1Comparator 1-bit DAC Feedback Resistor FPGA 2FO D Q FO/2 1 1 - Comb Filter Decimate 32 IIR Filter Decimate 75 18-bits 2Hz Data 2 nd Order  Fluxgate Magnetometer - Ground Magnetometer – GBO Design

7. THEMIS/GBO Engineering Peer Review 7 UCB, Oct. 17, 2003 UCLA GBO MAGNETOMETER SYSTEM OVERVIEW Ground Magnetometer – GBO Design PIC18F452 Micro-Controller GPS Serial Interface DB15F USB COM PORT USB Interface DB9F PPS Timing Interface GPS Heater & Power Interface TCXO XC2S50 FPGA FPGA FLASH Power Regulation +/-15V +5V Power Regulation +/-15V +5V DIN-5F Axis 1 Axis 2 Axis 3 DB25F Drive Sensor Heater

8. THEMIS/GBO Engineering Peer Review 8 UCB, Oct. 17, 2003 UCLA GBO Magnetometer Chassis -Mechanical Ground Magnetometer – GBO Design DB15F – GPS Receiver DB9F – GBO Data System USB Type B – GBO Data System 21.6cm DB25F – Fluxgate Sensor DIN 5F – +12V Power Input 5.1cm 12.7cm

9. THEMIS/GBO Engineering Peer Review 9 UCB, Oct. 17, 2003 UCLA GBO Magnetometer Sensor -Mechanical DB25M ~100cm Ground Magnetometer – GBO Design 12.7cm 50Meters (Max)

10. THEMIS/GBO Engineering Peer Review 10 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Ground Magnetometer Fluxgate Sensor ~100cm

11. THEMIS/GBO Engineering Peer Review 11 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Ground Magnetometer Fluxgate Sensor Sub Components

12. THEMIS/GBO Engineering Peer Review 12 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Ground Magnetometer -Electrical Input Voltage:(9 – 18)VDC Input Current:GPS system100ma. Magnetometer150ma. Sensor Heater600ma. Electronics Heater100ma.

13. THEMIS/GBO Engineering Peer Review 13 UCB, Oct. 17, 2003 GBO Magnetometer Data Timing Sampling determined by TCXO (<10ppm aging) Time Tagging determined by GPS (<100μsec) GPS GPS Time Quality Factor Logged Time Recalculated Periodically Typ. Hourly Re-Synchronization at Programmable Rate Optional Ground Magnetometer – GBO Design

14. THEMIS/GBO Engineering Peer Review 14 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Sigma-Delta Fluxgate Magnetometer Test Data

15. THEMIS/GBO Engineering Peer Review 15 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Sigma-Delta Fluxgate Magnetometer Test Data

16. THEMIS/GBO Engineering Peer Review 16 UCB, Oct. 17, 2003 GBO Magnetometer Data Products Data Inputs Include:  Configuration File (UCLA_GBO_ssss_Vxx_xx.INI)  uP Firmware File (UCLA_GBO_ssss_Vxx_xx.UPF)  FPGA Firmware File (UCLA_GBO_ssss_Vxx_xx.GAF) Data Outputs Include:  Mag Vector Data (ssssdddddd_MAG_hh_cc.RMD)  Mag Housekeeping Data (ssssdddddd_MAG_hh_cc.HKD)  Magnetometer Log Data (ssssdddddd_MAG_hh_cc.LOD)  Mag Calibration Data (UCLA_GBO_ssss_Vxx_xx.CAL) Ground Magnetometer – GBO Design

17. THEMIS/GBO Engineering Peer Review 17 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design GBO Magnetometer Vector Data File Format [File Preamble(I 32 )] [File Name(string “ssssdddddd_MAG_hh_cc.RMD”)] [Nominal Vector Interval in msec (I 32 )] [Time of next data point(string “mmddyyyy-hh:mm:ss-mmm”)] [Number of vectors to follow N (I 32 )] [V ector 1 (3xI 32 )] [V ector 2 (3xI 32 )] …… …..[Vector N-1 (3xI 32 )] [Vector N (3xI 32 )] [Time of next data point(string “mmddyyyy-hh:mm:ss-mmm”)] [Number of vectors to follow N (I 32 )] [V ector 1 (3xI 32 )] [V ector 2 (3xI 32 )] …… …..[Vector N-1 (3xI 32 )] [Vector N (3xI 32 )] [File Postamble( I 32) ]

18. THEMIS/GBO Engineering Peer Review 18 UCB, Oct. 17, 2003 GBO Data System Software Features Magnetometer Setup using LabView Program  Real time display of three axis time series data  Real time display of three axis Power Spectra  Operator control of Magnetometer settings including, Heaters, Offset DACs, and operating modes Autonomous Operations using C++ Program  Command Line execution  Initialization controlled via Configuration file Ground Magnetometer – GBO Design

19. THEMIS/GBO Engineering Peer Review 19 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Ground Magnetometer GBO Schedule

20. THEMIS/GBO Engineering Peer Review 20 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Ground Magnetometer GBO Schedule

21. THEMIS/GBO Engineering Peer Review 21 UCB, Oct. 17, 2003 Ground Magnetometer – GBO Design Ground Magnetometer GBO Schedule