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05
Korea Aerospace Research Institute Promising Technologies for Commercialization
Outline of Technology
Technical features and
advantages
Distinctiveness
• A procedure of localizing jammers is reduced
by only searching a quadrant having an actual
jammer among coordinates where location
solutions are shown and excluding other
quadrants from the searching range.
TLO of the KARI
Person-in-charge
Senior Administrator Moon-Hee, Cho
E-mail : moonyxp@kari.re.kr
R&D Performance Diffusion Division
A device and method capable of localizing multiple
jammers using a time difference of signal arrival
(TDOA)
Localization
method of
multiple
jammers
Inventor
Senior researcher, Deok-won Lim
Team
Satellite Navigation Team
Status of right
• US : 8587478
• US : 14/763465
Title
• LOCALIZATION METHOD OF MULTIPLE JAMMERS
BASED ON TDOA METHOD
• DISTURBANCE SIGNAL DETECTION APPARATUS
AND METHOD
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Lab-scale basic performance verification
Technical Readiness Level
TRL 1
TRL 2
TRL 5
TRL 6
TRL 7
TRL 8
TRL 9
TRL 4
Technical effects
• Accurate detection of locations of multiple jammers, and secure operation of a system are
possible.
Technical features and advantages
Prior art
Subject technology
Flowchart of localization algorithm of multiple jammers
All the combinations of true TDOA measured values
and false TDOA measured values for estimating
locations of multiple jammers à Localization is not
possible because the estimated values of locations of
jammers do not converge at one location, but are spread
broadly.
An average value of true estimated values converges
near multiple actual jammers
Technical detail
Flowchart of localization algorithm of multiple jammers
1. Multiple sensors for receiving GPS signal are arranged, and TDOA measurements are obtained
while a reference sensor is changed in order among the multiple sensors.
2. Location solutions of multiple jammers are estimated using the obtained TDOA measurements.
3. The estimated location solutions of multiple jammers are shown in the coordinates set in
reference to each sensor.
4. A searching interval and a searching range with respect to a quadrant having the highest density
of the location solutions shown in the coordinates are decided, and a cell including all true
location solutions corresponding to the number of sensors is searched while shifting by searching
intervals.
5. Each average value of distances between the true location solutions in the searching cells having
the true location solutions are calculated to define the number of jammers, and location solutions
of the jammers are calculated.
TRL 3
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05
Market and future prospects
Localization
method of
multiple jammers
• A satellite navigation system is an infrastructure used
in transportation, time, national defense, etc. the related
market is continuously increasing, and independent satellite
navigation systems have been established by the United
States and Russia as well, as by Europe, China, India, and
Japan.
• The GNSS market is expected to increase 8.3% every year
until 2019, and 4.6% until 2023. In 2023, the net sales of
GNSS chipset are anticipated to break through 100 billion
euros and the sales including smart devices will reach about
300 billion euros.
2013
0
50
100
150
200
250
300
2014
2015
(GLOBAL)
(GLOBAL)
2016
2017
2018
2019
2020
2021
2022
2023
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Source : European GNSS Agency, “GNSS Market Report”, Issue 4, Mar. 2015.
1 Obtaining estimated TDOA measurements by changing a reference sensor
2 Localizing all the locations of jammers from the estimated TDOA
measurements
3 Displaying all the location solutions of multiple jammers
4 Searching for a cell including true location solutions of multiple jammers
5 Calculating the total number of multiple jammers and location solutions
Demand for technology
Application parts
Defense industry company
Mobile communication field
Traffic safety field
(aviation/maritime/railways, etc.)
Network equipment
manufacturer, etc.
National defense field including military planes,
tanks, warships, etc.
• Applicable to various fields of mobile communication base stations, national defense equipment,
etc.
- A technique of localizing multiple jammers can be utilized in diverse fields using GPS signals
such as mobile communication, measurement, emergency rescue, agriculture, traffic safety
including aviation/maritime/railroad/highway, infrastructure, and national defense related
equipment including military planes.
Applications
