Around and Around: An Investigation of Signals for Acoustic Position Estimation of Moving Objects

摘要: Abstract —Positioning methods have been investigated fordecades now. Especially conditions like environmental noise andmultipath propagation still drive the quest for robust methodsthat provide precise position estimates. Where radio frequencysignals stumble, sound may succeed. Our approach to acousticpositioning is based on time-of-flight measurements utilizing thecorrelations of audible test signals and a choice ofsystem parameters that allow positioning in harshenvironments such as mines. Applying linear frequency chirpsignals, we obtain precision estimates themillimeter range stationary situations. However, soon asthe object under observation motion, its velocity causes thereceived be Doppler-shifted, thus introduces atime-shift distortion respective correlation signals.In this contribution, present remedy Doppler shiftproblem by using pairs hyperbolic chirp signals. We haveinvestigated performance chirpsignals employing them estimate mobiletag which was moved circle at different levels constantvelocity. results illustrate single chirps, theposition describe distorted due Dopplershift. pair setup, attain positionestimates are alignment with circular movement. Instationary scenarios, very high rangeof 7 mm can achieved down signal-to-noise ratio -2.8 dBusing In situations objects moving ata 1 m/s, use leads toa around 3 cm of-3.2 dB.