Vlf interferometer
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VLF Interferometer. Defense University Research Instrumentation Program (DURIP). Project Advisor: Umran Inan Project Team: Jeffrey Chang, Katie Braden, Timothy Chevalier, Andrew Park, Joseph Payne. What Is the Interferometer?.

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VLF Interferometer

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VLF Interferometer

Defense University Research Instrumentation Program (DURIP)

Project Advisor: Umran Inan

Project Team: Jeffrey Chang, Katie Braden, Timothy Chevalier, Andrew Park, Joseph Payne


What Is the Interferometer?

  • Nine element array of time synchronous receivers.

  • Capable of simultaneous recording in 3 channels, like an expensive VCR.

  • Low power, battery operated, standalone units.

  • Modular design for easy upgrade.


Purpose of Interferometer

  • Measure near field of HAARP modulated electrojet currents.

    • Determine spatial distribution of currents.

    • Help to maximize ELF/VLF wave production.

  • Standalone receiver that can truly be deployed anywhere anytime.


Validate Sampling method

Test Connection to CF media.

Fix any gotchas

Cleanup design

Improve Stability

Get ready for Production

Interferometer V2.0

Version 1.0

Version 2.0


Arrangement of Interferometer


Interferometer Capabilities

  • Capture from ~100 Hz to ~10 kHz.

    • Upper bound is largely variable by changing filter and sample rate.

  • Sensitivity of 1.5*10-6 v/m-Hz-1/2 at 1khz.

  • Low power consumption, ~6W.

  • Store 1 GB of data.


Block Diagram of Receiver

Antennas

Line Receiver

Clipper

Anti-aliasing LPF Filter

Preamplifier

16-Bit A/D (250 ksps)

Preamp

1GB Storage Device

CPU (i386)

Control Logic (FPGA)

UT+ Oncore GPS

Modem?

Line Receiver


Time Synchronization

1PPS GPS Clock

Control Signals

FPGA

16-Bit A/D

Temp. Controlled Crystal Osc. ~10MHz

Control Signals

Data Bus

i386


Main Equipment

  • Tern i386 controller.

  • IBM Microdrive.

  • Motorola Oncore UT+.


Equipment Cont.

  • 1 x 6V, 189 A-Hr Batteries

    2 x 12V, 55 A-Hr Batteries

  • Laptop.

  • Wagon!


Preamp


Preamp


Preamp Cards

  • Matches the impedence of the square loop antenna with a transformer.

  • Amplifies and filters signal.

  • Output driver with a transformer.


Line Receiver


Motherboard


Motherboard

  • Voltage regulation.

  • Mounts for CPU and GPS cards.

  • FPGA for glue logic.

  • ISA type slots for adapter cards.


CPU Card

  • Manufactured by Tern.

  • I386 u-controller with lots of goodies…

  • Two serial lines, one for programming, one for LCD display and GPS.

  • 16 Bit data bus, 7 Bit Addressing (but word access only)

  • Port pins as CS for ADC or CF card.


GPS Card

  • Motorola Encore GPS card.

  • Small form factor.

  • For timing use, +/- 500ns timing accuracy.

  • Serial I/O


Filter Card

  • Instrumentation Amplifier – differential input to single ended output.

  • Selectable 8 pole or 16 pole Chebyshev filter.

  • Selectable output gain from unity to 40dB.


Sample Filter


CF Storage Card

  • CF connector, capable of docking with both Type I or Type II CF cards.

  • CF cards in IDE mode.

  • Otherwise, nothing special.

  • Future version might have two flash card slots on it.


Sampling Card

  • 3 LTC1606 ADC chips, simultaneous sampling (rated @ 250 ksps each).

  • Sampling controlled by FPGA, with CS from processor.

  • 16 bit tri-state buffers as hacked remedy to power problem

  • Temperature controlled oscillator…for accurate timing.


HAARP

Near transmitter

Power lines nearby

Lake Louise & Paxton

~45 Minutes away

In the middle of no-where

No power lines nearby

Low Noise

Locations


HAARP Setup


HAARP Setup


Lake Louise


Lake Louise


Lake Louise


Lake Louise


Lake Louise


HAARP SU Data


HAARP SU Data


HAARP SU Data


Lake Louise SU Data


Lake Louise SU Data


Lake Louise SU Data


HAARP AU Data


Lake Louise AU Data


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