Method and apparatus for removing spoofing signal in satellite navigation system
AssigneeElectronics and Telecommunications Research Institute
InventorsTae Hee KIM, Sang Uk LEE
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Abstract
Provided is a method and apparatus for removing a spoofing signal. The apparatus may convert a global positioning system (GPS) signal from an RF signal to an IF signal, and remove a spoofing signal based on whether the spoofing signal is present in the RF signal. The apparatus may obtain and track the spoofing signal using the IF signal, and generate a characteristic of the spoofing signal. The apparatus may generate an anti-spoofing signal by shifting a phase of the spoofing signal 180 degrees based on the characteristic of the spoofing signal.
Claims12
An apparatus for removing a spoofing signal, the apparatus comprising:
- a radio frequency (RF)-intermediate frequency (IF) converter to convert a global positioning system (GPS) signal from an RF signal to an IF signal, and to remove a spoofing signal based on whether the spoofing signal is present in the RF signal;
- a spoofing signal processor to obtain and track the spoofing signal using the IF signal and to generate a characteristic of the spoofing signal;
- an anti-spoofing signal generator to generate an anti-spoofing signal by shifting a phase of the spoofing signal 180 degrees based on the characteristic of the spoofing signal;
- and
- a spoofing signal detector/controller to determine whether the spoofing signal is present and to control the spoofing signal processor and the anti-spoofing signal generator.
A method of removing a spoofing signal, the method comprising:
- determining whether a spoofing signal is present in a received GPS signal between a radio frequency (RF) output terminal of a GPS antenna and an RF input terminal of a GPS receiver;
- transmitting the received GPS signal to the RF input terminal of the GPS receiver when the spoofing signal is absent;
- extracting a characteristic of the spoofing signal when the spoofing signal is present;
- generating an anti-spoofing signal based on the extracted characteristic of the spoofing signal;
- and
- removing the spoofing signal using the generated anti-spoofing signal.
Dependencies are inferred from the claim text.