VLF Interferometer VLF Interferometer Defense University Research Instrumentation Program (DURIP) Project Advisor: Umran Inan Project Team: Jeffrey Chang, Katie Braden, Timothy Chevalier, Andrew Park, Joseph Payne
Jan 02, 2016
VLF InterferometerVLF 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?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 InterferometerPurpose 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.
Interferometer V2.0Interferometer V2.0
Validate Sampling method
Test Connection to CF media.
Fix any gotchas
Cleanup design Improve Stability Get ready for
Production
Version 1.0 Version 2.0
Arrangement of InterferometerArrangement of Interferometer
Interferometer CapabilitiesInterferometer 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 ReceiverBlock Diagram of Receiver
Antennas
Preamplifier
Line Receiver Clipper Anti-aliasing LPF Filter
16-Bit A/D (250 ksps)
Control Logic (FPGA)
CPU (i386)
UT+ Oncore GPS
1GB Storage Device
Modem?
Preamp
Line Receiver
Time SynchronizationTime Synchronization
1PPS GPS Clock
Temp. Controlled
Crystal Osc. ~10MHz
FPGA 16-Bit A/D
Control Signals
i386
Data BusControl Signals
Main EquipmentMain Equipment
Tern i386 controller.
IBM Microdrive.
Motorola Oncore UT+.
Equipment Cont.Equipment Cont.
1 x 6V, 189 A-Hr Batteries
2 x 12V, 55 A-Hr Batteries
Laptop.
Wagon!
PreampPreamp
PreampPreamp
Preamp CardsPreamp Cards
Matches the impedence of the square loop antenna with a transformer.
Amplifies and filters signal.Output driver with a transformer.
Line ReceiverLine Receiver
MotherboardMotherboard
MotherboardMotherboard
Voltage regulation.Mounts for CPU and GPS cards.FPGA for glue logic.ISA type slots for adapter cards.
CPU CardCPU 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 CardGPS Card
Motorola Encore GPS card.Small form factor.For timing use, +/- 500ns timing accuracy.Serial I/O
Filter CardFilter 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 FilterSample Filter
CF Storage CardCF 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 CardSampling 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.
LocationsLocations
HAARP– Near transmitter– Power lines nearby
Lake Louise & Paxton– ~45 Minutes away– In the middle of no-where– No power lines nearby– Low Noise
HAARP SetupHAARP Setup
HAARP SetupHAARP Setup
Lake LouiseLake Louise
Lake LouiseLake Louise
Lake LouiseLake Louise
Lake LouiseLake Louise
Lake LouiseLake Louise
HAARP SU DataHAARP SU Data
HAARP SU DataHAARP SU Data
HAARP SU DataHAARP SU Data
Lake Louise SU DataLake Louise SU Data
Lake Louise SU DataLake Louise SU Data
Lake Louise SU DataLake Louise SU Data
HAARP AU DataHAARP AU Data
Lake Louise AU DataLake Louise AU Data