High precision hybrid RF and ultrasonic chirp-based ranging for low-power IoT nodes

EURASIP Journal on Wireless Communications and Networking

Table 2 Standard deviation and difference between actual distance and mean value (ε) from Monte Carlo simulations with a single microphone at a distance of 1.553 m

SNR (dB)		20	10	6	3	1	0
35 khz - 25 khz	ε	0.044	0.061	0.063	0.061	0.049	0.007
10 kHz BW	σ	0.024	0.043	0.058	0.092	0.277	0.573
45 khz - 25 khz	ε	0.001	0.011	0.008	0.008	0.029	0.068
20 kHz BW	σ	0.004	0.021	0.31	0.042	0.300	0.565
55 khz - 25 khz	ε	0	0	0	0.001	0.020	0.080
30 kHz BW	σ	0.001	0.014	0.020	0.042	0.316	0.652
65 khz - 25 khz	ε	0.001	0.002	0.004	0.005	0.029	0.109
40 kHz BW	σ	0.001	0.006	0.014	0.023	0.435	0.833
75 khz - 25 khz	ε	0.001	0.001	0.001	0.001	0.053	0.138
50 kHz BW	σ	0.001	0.004	0.008	0.099	0.550	0.887