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SCHOOL OF BIO AND CHEMICAL ENGINEERING DEPARTMENT OF BIOMEDICAL ENGINEERING ANALOG AND DIGITAL COMMUNICATION (BME18R204) SOLI SENSOR FOR GESTURE RECOGNITION USING RADAR TECHNIQUES PRESENTED BY M.MARIKANI (9916020076) BME IV YEAR KARE
MOTIVATION
(^) Free air gestures for HCI in wearable, mobile, etc. (^) Ubiquitous gesture sensing, computing
SYSTEM OVERVIEW
HARDWARE
RADAR FUNDAMENTALS
(^) Modulated EM emitted towards the target (^) TX - radiation scatters (^) RX – radiation (with some energy) intercepts (^) Target properties extraction and estimation
RADAR DESIGN
(^) Hardware (^) Signal processing (^) Radar control software
DSSS
GENERAL MODEL OF SPREAD SPECTRUM SYSTEM
CHANNEL ENCODER MODULATOR CHANNEL^ DEMODULATOR^ CHANNEL DECODER PSEUDONOISE GENERATOR PSEUDONOISE GENERATOR INPUT DATA OUTPUT DATA
DSSS
(^) Input fed into channel encoder (^) Signal modulated using sequence of digits (^) Spectrum spread (^) Bandwidth gets increased (^) Receiver uses same sequence to demodulate signal (^) Demodulated signal fed into channel decoder
FMCW RADAR
(^) Synthesizer generates a chirp (^) TX antenna transmits the chirp (^) RX antenna receives the chirp (^) RX signal mixed with TX signal (^) Formation of IF signal
APPLICATIONS IN HEALTHCARE
(^) Eliminating input devices (^) Streamlining surgery (^) Kinect-based gesture recognition system
