Angular Dependency of Human Speech Recognition using Interferometry Radar

The use of radar in speech recognition is a growing field of interest in recent years. The inclusion of radar introduces several new variables into the scenario. One of the lesser-known variables of this process is the effect that a radar’s inherent angular dependency has on the recovered speech signals. This paper presents a study into this effect seen through continuous wave (CW) Doppler radar. The vocal vibrations were detected without aid of secondary passive or active amplification to isolate the radars sensitivity to this effect. The phrases considered in this study were the words “A,” “I,” and “O.” The readings of each phrase were compared across several angles of observation to map the difference in signal-to-noise ratio (SNR) from 80 – 100 degrees for a person.