The anti-interference technology of the
UAV data link refers to the use of spread spectrum anti-interference technology, adaptive interference suppression technology, source and channel coding technology to ensure the smooth operation of the drone. In order to improve the system's anti-interference performance, reduce the intercept probability and detection probability, combined with the characteristics of the drone, the following technology should be strengthened:
(1) Anti-jamming technology develops from anti-jamming of single technology to combination of multiple technologies, from single physical layer anti-jamming to multi-layer combined with network layer and application layer to optimize anti-interference; from single device Anti-jamming develops to comprehensive anti-interference at the system level and network level.
(2) Anti-jamming intelligent zero-adjusting antenna: The intelligent zero-adjusting antenna adopts array signal processing and digital beamforming technology to form a zero point in the direction of the interference source, and the zero-setting depth can reach more than 20 decibels, thereby realizing airspace anti-interference.
(3) Adaptive interference calibration technique: The characteristics of the wideband useful signal and the narrowband interference signal are completely different in the frequency domain. According to this feature, the interference signal can be detected and eliminated by using adaptive trapping filtering technique.
(4) Cognitive-based anti-jamming technology: Cognitive-based anti-jamming technology is a new technology that combines spectrum sensing, spectrum management, and link transmission parameter reconfiguration. It uses spectrum sensing technology to obtain the occupancy of the spectrum space, provides a selectable alternate channel through spectrum management, and establishes the link on the new transmission channel to avoid the frequency band where the interference signal is located, thereby realizing reliable transmission of data.
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