Ground magnetometer
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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 specifications

Requirements & Specifications


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 AntennaDB-15F

    • GPS SerialNTP InterfaceDB-9F

    • USBData InterfaceUSB-B

    • SensorFluxgate MagnetometerDB-25F

    • PowerDC Voltage InputDIN-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 system100ma.Magnetometer250ma.Sensor Heater600ma. (max)Electronics Heater200ma. (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)

  • Delivery5/31/2004

  • EPO Software Windows LabView 7.0


Gmag software1

GMAG Software


Gmag software2

GMAG Software


Gmag software3

GMAG Software


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 #16/18/2004

GMAG #26/21/2004

GMAG #36/28/2004

GMAG #49/24/2004

GMAG #510/07/2004

GMAG #63/14/2005

GMAG #75/02/2005

GMAG #85/09/2005

GMAG #95/16/2005

GMAG #105/23/2005

GBO GPS Only Deliveries

GPS #17/02/2004

GPS #212/06/2004

GPS #31/25/2005

GPS #43/16/2005

GPS #55/16/2005

GPS #66/09/2005

GPS #711/01/2005

GPS #811/15/2005

GPS #912/01/2005

GPS #10TBD


Gmag delivery schedule1

GMAG Delivery Schedule

EPO GMAG Deliveries

EPOMAG #17/12/2004

EPOMAG #28/12/2004

EPOMAG #38/28/2004

EPOMAG #49/12/2004

EPOMAG #510/14/2004

  • EPOMAG #66/15/2005

  • EPOMAG #76/30/2005

  • EPOMAG #87/15/2005

  • EPOMAG #98/01/2005

  • EPOMAG #108/15/2005


Issues

Issues

  • GPS Operation at extreme low temperatures

  • LINUX application software in development


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