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Ground Magnetometer. David Pierce UCLA. CDR Topic Overview. GMAG Subsystem Requirements & Specifications Block Diagram Electrical Diagram / Layout Mechanical / Mass / Power GPS Timing Software Instrument Integration and Test Schedule Issues. Requirements & Specifications.

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Ground magnetometer

Ground Magnetometer

David Pierce

UCLA


Cdr topic overview
CDR Topic Overview

  • GMAG Subsystem

    • Requirements & Specifications

    • Block Diagram

    • Electrical Diagram / Layout

    • Mechanical / Mass / Power

    • GPS Timing

    • Software

    • Instrument Integration and Test

    • Schedule

    • Issues



Requirements specifications1
Requirements & Specifications

  • System Features

  • GPS Receiver Antenna and Electronics Integrated into one package May be located >30M from host (RS422 signals)  NTP compatible (1msec time accuracy)

  • Flxugate Magnetometer

  •  ±72KnT dynamic range @ 0.01nT Resolution (~23 bits) Offset DAC system for 256 possible ranges per axis  2 Vectors per second data rate Low Power < 4W Small Size 22cm x 13cm x 5cm Ruggedized All Weather Sensor Design USB interface for data retrieval and firmware upload


Block diagram

XC2S50

FPGA

PIC18F452

Micro-Controller

GPS Serial Interface

Block Diagram

  • UCLA GBO MAGNETOMETER SYSTEM OVERVIEW

TCXO

Sensor Heater

USB

USB Interface

FPGA FLASH

DB9F

Drive

PPS Timing Interface

Axis 1

DB25F

Axis 2

DB15F

Axis 3

GPS Heater & Power Interface

DIN-5F

Power Regulation

+/-15V +5V


Electrical interfaces
Electrical Interfaces

  • GMAG Interfaces

    • GPS ACUTIME2000 Antenna DB-15F

    • GPS Serial NTP Interface DB-9F

    • USB Data Interface USB-B

    • Sensor Fluxgate Magnetometer DB-25F

    • Power DC Voltage Input DIN-5F


Electrical interfaces1
Electrical Interfaces

GPS ACUTIME 2000 / NTP Interface Detail

USB

(Type B)

Data & Time Packets

Micro Controller

Precise Time Sync

COM2

(DB-9F)

RXD

RS-232 / TTL

Interface

GPS Configuration

RTS

GPS Time & Status

GPS

Connector

(DB-15F)

Event

RS-422 / TTL

Interface

PORTA

FPGA

PPS

PORTB

PORTB


Mechanical and thermal
Mechanical and Thermal

  • UCLA GBO Magnetometer Chassis

21.6cm

USB Type B – GBO Data System

DB9F – GBO Data System

All components rated to operate at -40C - +85C

DB15F – GPS Receiver

DIN 5F – +12V Power Input

13.4cm

DB25F – Fluxgate Sensor

5.1cm


Mechanical and thermal1
Mechanical and Thermal

  • GMAG PCB & Chassis


Mechanical and thermal2
Mechanical and Thermal

  • UCLA GBO Magnetometer Sensor

DB25M

50Meters (Max)

~100cm

12.7cm


Mechanical and thermal3
Mechanical and Thermal

  • Ground Magnetometer Fluxgate Sensor


Mechanical and thermal4
Mechanical and Thermal

  • Ground Magnetometer Fluxgate Sensor Components


Mechanical and thermal5
Mechanical and Thermal

  • Installed Fluxgate Sensor at LANL


Mass power
Mass & Power

  • Sensor Mass: 15 Kg

  • Chassis Mass: 1.2 Kg

  • Input Voltage: (9 – 18)VDC

  • Input Current: GPS system 100ma. Magnetometer 250ma. Sensor Heater 600ma. (max) Electronics Heater 200ma. (max)


Parts
Parts

  • All parts are industrial grade or better

  • All parts rated to operate at -40C - +85C


Gps timing
GPS Timing

  • GMAG Data Timing

  • Sampling determined by TCXO (<10ppm aging)

  • Time Tagging determined by GPS (5msec)

  • GPS Time Quality Factor Logged

  • Time Recalculated Periodically Typ. Hourly

  • Re-Synchronization at Programmable Rate Optional


Gmag software
GMAG Software

  • Program Components

  • GBO Site Installation Software Linux LabView 7.0

  • Delivery 5/24/2004

  • GBO Autonomous Software GNU C (POSIX)

  • Delivery 5/31/2004

  • EPO Software Windows LabView 7.0





Gmag software4
GMAG Software

  • GMAG 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)


Instrument integration and test
Instrument Integration and Test

Verification Tests Performed by UCLA

  • 2.6.1 GMAG Sensitivity (UCLA CF)

  • 2.6.2 GMAG 3-axis Sensing (SGDSD)

  • 2.6.3 GMAG Dynamic Range (UCLA CF)

  • 2.6.4 GMAG Time Resolution (UCLA CF)

  • 2.7.4 GPS Time Base (UCLA CF)

  • 2.7.9 Operating Temperature (UCLA CF)

    CF - Calibration Facility

    SGDSD - San Gabriel Dam Site Deployment


Gmag delivery schedule
GMAG Delivery Schedule

GBO GMAG Deliveries

GMAG #1 6/18/2004

GMAG #2 6/21/2004

GMAG #3 6/28/2004

GMAG #4 9/24/2004

GMAG #5 10/07/2004

GMAG #6 3/14/2005

GMAG #7 5/02/2005

GMAG #8 5/09/2005

GMAG #9 5/16/2005

GMAG #10 5/23/2005

GBO GPS Only Deliveries

GPS #1 7/02/2004

GPS #2 12/06/2004

GPS #3 1/25/2005

GPS #4 3/16/2005

GPS #5 5/16/2005

GPS #6 6/09/2005

GPS #7 11/01/2005

GPS #8 11/15/2005

GPS #9 12/01/2005

GPS #10 TBD


Gmag delivery schedule1
GMAG Delivery Schedule

EPO GMAG Deliveries

EPOMAG #1 7/12/2004

EPOMAG #2 8/12/2004

EPOMAG #3 8/28/2004

EPOMAG #4 9/12/2004

EPOMAG #5 10/14/2004

  • EPOMAG #6 6/15/2005

  • EPOMAG #7 6/30/2005

  • EPOMAG #8 7/15/2005

  • EPOMAG #9 8/01/2005

  • EPOMAG #10 8/15/2005


Issues
Issues

  • GPS Operation at extreme low temperatures

  • LINUX application software in development


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