43results about How to "Improve information transmission efficiency" patented technology

The invention discloses a brain-computer interface communication system based on asymmetric visual evoked potential. The system comprises a liquid crystal display, an electroencephalogram electrode, an electroencephalogram amplifier and a computer processing platform, wherein the liquid crystal display is used for displaying a stimulation interface; the electroencephalogram electrode is used for collecting an electroencephalogram biological signal; the electroencephalogram amplifier is used for amplifying the signal through the electroencephalogram amplifier and inputting the amplified signal into a computer after carrying out filtering; the computer processing platform is used for designing and executing commanding codes based on a peripheral view asymmetric visual stimulation according to induction characteristics of the asymmetric VEP (Visual Evoked Potential), and finally, the electroencephalogram signal is decoded and converted into a BCI (Brain-Computer Interface) instruction to be output. Compared with a traditional visual BCI system, the brain-computer interface communication system based on asymmetric visual evoked potential can reduce the visual feeling of fatigue of a subject, meanwhile, the information transmission efficiency of the BCI system is improved, a perfect brain-computer interface system can be obtained through further researches, and considerable social benefits and economic benefits can be possibly caused.

The invention discloses a method for realizing a high anti-interference unmanned aerial vehicle remote control data link, which comprises two steps of data transmitting and data receiving, wherein the data transmitting comprises the steps of performing serial-parallel conversion, performing M-ary spread spectrum on parallel N-channel binary baseband information to obtain N-channel M-ary spread spectrum information, performing digital modulation, controlling a frequency hopping source to generate frequency hopping carriers by frequency hopping sequences and performing data sending; and the data receiving comprises the steps of receiving transmitted signals for bandpass filtering, synchronizing the system and dehopping, performing M-ary despreading, performing digital demodulation and performing serial-parallel conversion. The method adopts multi-channel M-ary spread frequency technology, and has higher information transmission efficiency compared with single-channel M-ary spread spectrum with high information transmission; the method adopts multi-channel M-ary spread spectrum, and each channel adopts frequency hopping sequences with different lengths and different code rules so that each channel has higher anti-interference ability; and the method adopts the combination of spread spectrum technology and frequency hopping technology, has the ability of resisting narrow-band interference and near-far effect of a frequency hopping communication mode, and meets the requirement of high interference resistance.

The invention belongs to the technical field of unmanned aerial vehicle communication, and discloses an unmanned aerial vehicle cellular communication base station selection method based on position information, which comprises the following steps: S1, building a hybrid base station; s2, constructing a cellular communication network; s3, the unmanned aerial vehicle obtains the longitude, latitude,height and timestamp of the unmanned aerial vehicle in each time slice; s4, taking the hybrid base station in the communication range of the unmanned aerial vehicle as a communication base station, and sending a telemetry frame to the communication base station by the unmanned aerial vehicle; s5, counting the distance by the communication base station; s6, the communication base station sends a distance statistics frame to the console in each time slice; s7, the console marks an active base station and an inactive base station of the unmanned aerial vehicle according to the accumulated distance of the sliding window; s8, the console notifies the movable base station to switch to the current movable base station; and S9, entering the next time slice to accumulate the distance of the next round of sliding window. The method is wide in communication range, and solves the problem of selection of the most suitable base station by the unmanned aerial vehicle in a sliding window distance accumulation mode.