Accurate and Contactless Vital Sign Detection in Short Time Window with 24 GHz Doppler Radar

Table 3

Displacement MAE under different arc lengths.

Amplitude	Central angle	MAE (percentage of error in displacement)
		The proposed method	Ellipse fitting algorithm
3 mm	1.92π	0.3049 mm (5.08%)	0.3891 mm (6.49%)
2.5 mm	1.6π	0.2044 mm (4.09%)	0.2938 mm (5.88%)
2 mm	1.28π	0.1944 mm (4.86%)	0.1955 mm (4.89%)
1.5 mm	0.96π	0.1502 mm (5.01%)	0.3293 mm (10.98%)
1 mm	0.64π	0.0827 mm (4.14%)	0.1902 mm (9.51%)
0.5 mm	0.32π	0.1008 mm (11.08%)	2.5702 mm (257.02%)