THEMIS/GBO CDR Peer Review 1 Univ. of Calgary, Apr. 26-27, 2004 Ground Magnetometer David Pierce...

THEMIS/GBO CDR Peer Review 1 Univ. of Calgary, Apr. 26-27, 2004

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

Level Requirement Capability Comply? L1 Onset times to <30s Sample rate 2 Hz Yes L1 Determine onset locations Over 30 MAG sites Yes L2 Current disruption latitudes Churchill chain ~1 o spacing Yes L2 Identity PiB occurrences Sample rate 2 Hz; Res. 0.03 nT Yes L4 Measure ± 2000 nT Range ± 72,000 nT Yes L4 Resolve ±1 nT Resolution 0.03 nT (22 bits) Yes L4 Provide 1s time resolution Sample rate 2 Hz Yes L5 Survive arctic winter conditions Sensors operate at -170 o C Yes L5 Maintain orientation <5 o Seasonal tilting <5 o Yes


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

UCLA GBO MAGNETOMETER SYSTEM OVERVIEW

PIC18F452

Micro-Controller

GPS Serial Interface

DB

15FU

SB USB

Interface

USB Interface

DB

9F

PPS Timing Interface

PPS Timing Interface

GPS Heater & Power Interface

GPS Heater & Power Interface

TCXOTCXO

XC2S50

FPGA

FPGA FLASH

FPGA FLASH

Power Regulation

+/-15V +5V

Power Regulation

+/-15V +5V

DIN

-5F

Axis 1Axis 1

Axis 2Axis 2

Axis 3Axis 3

DB

25F

DriveDrive

Sensor Heater

Sensor Heater


Electrical Interfaces

GMAG Interfaces

GPS ACUTIME2000 Antenna DB-15F

GPS Serial NTP Interface DB-9F

USB Data Interface USB-B

Sensor Fluxgate MagnetometerDB-25F

Power DC Voltage Input DIN-5F


Electrical Interfaces

Micro ControllerMicro Controller

FPGA FPGA

RS-422 / TTLInterface


GPS Connector

(DB-15F)

GPS Connector

(DB-15F)

Event

PORTA

PORTB

PORTB

PPS

COM2(DB-9F)

COM2(DB-9F)



RXD

RTS

USB(Type B)

USB(Type B)

Data & Time Packets

GPS ACUTIME 2000 / NTP Interface Detail

GPS Time & Status

Precise Time Sync

GPS Configuration


Mechanical and Thermal

UCLA GBO Magnetometer Chassis

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

13.4cm

All components rated to

operate at -40C - +85C



GMAG PCB & Chassis



UCLA GBO Magnetometer Sensor

DB25M

~100cm

12.7cm

50Meters (Max)



Ground Magnetometer Fluxgate Sensor



Ground Magnetometer Fluxgate Sensor Components



Installed Fluxgate Sensor at LANL


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

All parts are industrial grade or better

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


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

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 Software


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

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

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 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

GPS Operation at extreme low temperatures

LINUX application software in development

THEMIS/GBO CDR Peer Review 1 Univ. of Calgary, Apr. 26-27, 2004 Ground Magnetometer David Pierce...

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