RESEARCHING THE GNSS RECEIVER JAMMERS THAT ARE RESISTANT TO SUPPRESSION THROUGH EMPLOYMENT OF COHERENT AUTOMATIC JAMMING CANCELERS

Active jamming of a global navigation system GNSS receiver (GPS, Galileo, GLONASS, BeiDou) is of growing significance for the missions of security, control and monitoring. GNSS facilitates organization of various tasks: transportation, protecting mobile facilities or persons, traffic control, and a lot of others. Organizing generation of effective jamming denying normal navigation represents an important applied problem. Jamming GNSS, even though formally subject to international restrictions, is nevertheless a mandatory military technical component of ensuring the defensive capability of any developed state.

The experience of recent years testifies to fast development of the equipment generating jamming against GNSS, and the technologies of counteracting jamming. Effective employment of jamming against GNSS users made the arms manufacturers seriously tackle the problem of improving jamming immunity of GNSS through modern techniques. Given the certain narrow limits for this characteristic of a system (long distances to satellites, limitations imposed on the power of information signals emitted by them, feeble directivity of their transmitting antennas), the countries possessing GNSS have published a plethora of information related to having achieved a dramatic improvement of their antijamming capacity giving rise to certain doubt in objectivity of the data.

The article presents the results of scientific analysis and modeling of effectiveness of jamming against users of GNSS information with the receivers outfitted with correlative automatic jamming cancellers (AJC). Proof is provided of corrupting effectiveness of jamming cancellation, based on use of essentially parametric properties of the AJCs. 

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