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IEEE/ICACT20230149 Slide.04        [Big Slide]	Oral Presentation
	These are some examples of drone RF signals. Generally, the remote control signals or the command and control signals are frequency hopping spread spectrum. They hop between a range of frequencies for drones like DJI S900. For simple cases, it may also hop between two or three frequencies like you see for Spektrum DSM 2. This is a combined remote control and video RF signals for DJI phantom 3. Generally, the video RF signals are direct sequence spread spectrum or OFDM signal and as usual the hopping signal is the remote control signal.

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