October 10, 2015ECE4007 L01, 02, & 03 Fall 20081 Detection of Aircraft Using Passive Radar Ali Athar...
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Transcript of October 10, 2015ECE4007 L01, 02, & 03 Fall 20081 Detection of Aircraft Using Passive Radar Ali Athar...
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 1
Detection of Aircraft Using
Passive RadarAli Athar
Luis CardonaThomas KingVarun PrasadRahul Sanon
Blake StewartMisam Taherbhai
Sections: L01, L02, & L03
Georgia Institute of TechnologySchool of Electrical & Computer Engineering
Project Advisor: Prof. Aaron Lanterman
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 2
Overview• Covert detection of airborne
objects • System advantages
– System is concealed – No transmitter required – No frequency allocation– Low power requirements
• System Users– Air Traffic Controllers– Military
• Total system cost: $96,932
Airplane
Transmitter
Receiver
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 3
Design Objectives
• Detecting airplane at range of 15-20 miles• Capturing reflected FM radio signals that
have bounced off the airplane• Data processing
– Filtering desired frequencies– Amplifying as well as digitizing them– Computing the signals with software
• Laying the foundation for further analysis
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 4
RF Front End
Figure taken from: A. Lanterman, “DURIP: Integrated Sensing and Computation for Passive Covert Radar, Signals Intelligence, and Other Applications Driven by Moore’s Law”
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 5
Atlanta Area Transmitters
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 6
99.7MHz FM (100kW)
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 7
Periodic Antennas KMA4113
Log Periodic Antenna Antenna positioning
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 8
D103J Discone Antenna
Discone Antenna Frequency (Hz)
Spectrum Analysis
Am
plit
ude
(d
B)
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 9
Antenna SpecificationsD130J Discone
• Diamond Antennas• Omnidirectional• Unity gain of 2dbi• Exploration of
beamforming techniques same as Lockheed Martin’s Silent Sentry 3 system
KMA 4113• Allow exploration of
systems such as Paul Howlands demo system at NATO and Prof. Sahr’s (UW) Manastash Ridge radar
• One pointed to get reflected path signal
• One copies the signal from exploited transmitter
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 10
Frequency Ranges
Antennas
Split
TV50 – 950
MHz
FM88 – 108
MHz
UHF300 – 3K
MHz
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 11
Gain Control Stage
• Maximize number of bits for A/D• Use 8-bit programmable attenuators
Attenuation range: 0 – 16.5 dB
(0.1+0.2+0.4+0.8+1+2+4+8 = 16.5)
SMA
Logic Adapter for TTL signals from I/O board
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 12
Power Source
• Acopian power supply for 15V• 12 Volt power supply for 12V
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 13
Equipment to be Powered
• Preamplifiers require 15V• Oscillators require 12V• Attenuators require 12V
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 14
Project Demonstration
• Acquiring and analyzing data– Antennas– Filters– Attenuators and Amplifiers– Spectrum Analyzer
• Ability to control equipment• Presence of strong carrier and
Doppler shifted tracks in data• Cross correlation with Doppler data
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 15
Current Status & Issues• Antennas
– Two 12ft log-periodic constructed– One discone antenna assembled– Mounting logistics to be figured out
• Filters and Gain control– Map I/O channels with TTL pins– Determine the optimal filter configuration– Organize equipment for interchangeability
• Lack of reliable drivers for A/D conversion
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 16
Completed Design AspectsLegend
Completed
Data Acquisition
Post Data Acquisition
Figure taken from: A. Lanterman, “DURIP: Integrated Sensing and Computation for Passive Covert Radar, Signals Intelligence, and Other Applications Driven by Moore’s Law”
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 17
Project Schedule
• Assembled discone antenna Oct 01 • Assembled Log-periodic Antennas Oct 18 • Mapped channel lines to TTL input Oct 21
• Connect log-periodic with filter and amps Nov 01• Operation of one attenuator Nov 08• Mount antennas and pass cable Nov 10• Reading data acquired by cards Dec 08• Reliably detect aircraft Dec 12
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 18
Budget and Cost Analysis
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 19
Summary
• Status– Antennas– Power– Attenuation and A/D conversion– Software scripts
• Great platform– Flexibility– Research usage
April 21, 2023 ECE4007 L01, 02, & 03 Fall 2008 20
Questions?