Detecting and localization method of unknown signal using aircraft with ADS-B system
A method of detecting an unknown signal and estimating a source location of the unknown signal using aircraft based on an automatic dependent surveillance-broadcast (ADS-B) system is provided. The method includes a first step (S 100 ) for obtaining from a plurality of airborne aircrafts provided with a network system, aircraft signals transmitted to an air traffic control (ATC) and a second step (S 200 ) for detecting, by the ATC, a presence of an unknown signal in the aircraft signals based on one of a time difference of arrival (TDOA) method, a time of arrival (TOA) method, and an angle of arrival (AOA) method. The method further includes a third step (S 300 ) for estimating the source location of the unknown signal and a fourth step (S 400 ) for transmitting unknown signal generation information associated with the unknown signal and the source location of the unknown signal to neighboring aircraft and the ATC.
1. A method of detecting an interference signal and estimating a source location of the interference signal using network connected aircraft, the method comprising:
obtaining, by airborne aircrafts, GNSS signals transmitted from navigation satellites affected by the interference signal transmitted from the source location of the interference signal, and obtaining, by the airborne aircrafts, jammer to noise ratio (J/N) measurements from the GNSS signals affected by the interference signal;
transmitting, by the airborne aircrafts, from a plurality of airborne aircrafts provided with a network system to an air traffic control (ATC), jammer to noise ratio measurements, through the network;
detecting, by the air traffic control (ATC), a presence of the interference signal by analyzing the J/N measurements;
estimating, by the ATC, the source location of the interference signal using the J/N measurements; and
transmitting, by the ATC, the source location of the interference signal, to neighboring aircraft and a second ATC through a flight information services-broadcast (FIS-B) or a notice to airmen (NOTAM).
2. The method of claim 1 , wherein the estimating comprises:
estimating the source location of the interference signal based on an equation represented
d
J
i
j
=
J
i
-
J
j
=
10
α
log
10
(
ⅆ
j
ⅆ
i
)
,
wherein and J i and J j each denote a signal power of the interference signal received from receivers (i,j), α denotes a path loss index, and d i and d j denote a distance from the source of the interference signal to the receivers (i, j).
3. The method of claim 1 , wherein the estimating comprises:
estimating the source location of the interference signal based on an equation represented by
dJ ij = JNR i − JNR j =( J i − N i )−( J j − N j )≈ J i − J j ,
wherein JNR i and JNR j each denote a J/N measurement in receivers (i, j), and N i denotes noise of a receiver (i).