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GROUND MAGNETOMETER GBO DESIGN

GROUND MAGNETOMETER GBO DESIGN. 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)

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GROUND MAGNETOMETER GBO DESIGN

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  1. GROUND MAGNETOMETER • GBO DESIGN

  2. 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. Ground Magnetometer – GBO Design • GPS Receiver Block Diagram GPS Receiver RS232 bidirectional Up to 30M cable length USB Interface GBO Data System RS232 bidirectional To Power Supply Power Control 12VDC Survival Heater and Thermistor Antenna Heater Up to 50M cable length GPS Power GBO Magnetometer To Fluxgate Sensor

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

  5. Ground Magnetometer – GBO Design Second Order Sigma-Delta Modulator x(n) FPGA xdt xdt 21-bits Integrator 2 Comparator Integrator 1 Digital Decimation Filter Fs y(n) x(t) S S - - y(t) Fs:fs 32:1 1-bit DAC Fluxgate Sensor Band-Pass Filter Analog-to-Digital Converter Synch demodulator Input Amplifier xdt Integrator AC Coupling S ADC 16-24 bits Feedback Resistor

  6. Ground Magnetometer – GBO Design 2nd Order SD Fluxgate Magnetometer 2nd Order SD Fluxgate Magnetometer Fluxgate Sensor Synch demodulator Input Amplifier xdt xdt Integrator 1 Comparator Integrator 1 AC Coupling S S D Q 1 - FO/2 - Feedback Resistor 2FO 1-bit DAC 1 FPGA Comb Filter Decimate 32 18-bits IIR Filter Decimate 75 IIR Filter 2Hz Data

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

  8. Ground Magnetometer – GBO Design • UCLA GBO Magnetometer Chassis - Mechanical 21.6cm USB Type B – GBO Data System DB9F – GBO Data System DB15F – GPS Receiver DIN 5F – +12V Power Input 12.7cm DB25F – Fluxgate Sensor 5.1cm

  9. Ground Magnetometer – GBO Design • UCLA GBO Magnetometer Sensor - Mechanical DB25M 50Meters (Max) ~100cm 12.7cm

  10. Ground Magnetometer – GBO Design ~100cm • Ground Magnetometer Fluxgate Sensor

  11. Ground Magnetometer – GBO Design • Ground Magnetometer Fluxgate SensorSub Components

  12. Ground Magnetometer – GBO Design • Ground Magnetometer - Electrical • Input Voltage: (9 – 18)VDC • Input Current: GPS system 100ma. Magnetometer 150ma. Sensor Heater 600ma. Electronics Heater 100ma.

  13. Ground Magnetometer – GBO Design • 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

  14. Ground Magnetometer – GBO Design • Sigma-Delta Fluxgate Magnetometer Test Data

  15. Ground Magnetometer – GBO Design • Sigma-Delta Fluxgate Magnetometer Test Data

  16. Ground Magnetometer – GBO Design • 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)

  17. Ground Magnetometer – GBO Design • GBO Magnetometer Vector Data File Format • [File Preamble(I32)] [File Name(string “ssssdddddd_MAG_hh_cc.RMD”)] • [Nominal Vector Interval in msec (I32)] • [Time of next data point(string “mmddyyyy-hh:mm:ss-mmm”)] • [Number of vectors to follow N (I32)] [Vector 1 (3xI32)] [Vector 2 (3xI32)] …… • ….. [Vector N-1 (3xI32)] [Vector N (3xI32)] • [Time of next data point(string “mmddyyyy-hh:mm:ss-mmm”)] • [Number of vectors to follow N (I32)] [Vector 1 (3xI32)] [Vector 2 (3xI32)] …… • ….. [Vector N-1 (3xI32)] [Vector N (3xI32)] • [File Postamble(I32) ]

  18. Ground Magnetometer – GBO Design • 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

  19. Ground Magnetometer – GBO Design Ground Magnetometer GBO Schedule

  20. Ground Magnetometer – GBO Design Ground Magnetometer GBO Schedule

  21. Ground Magnetometer – GBO Design Ground Magnetometer GBO Schedule

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