Sliding Mode Control Based on High-Order Linear Extended State Observer for Near Space Vehicle

Table 2

Phase errors of high-order LESO in the low-frequency band.

System order	Expansion order	Observation bandwidth	Phase errors at 0.2 rad/s (deg)	Phase errors at 0.4 rad/s (deg)	Phase errors at 0.8 rad/s (deg)
3	1	5	-9.14	-18.3	-36.4
3	2	5	-0.143	-1.07	-6.81
3	3	5	0.0715	0.526	2.77
3	1	10	-4.58	-9.14	-18.3
3	2	10	-0.0182	-0.143	-1.07
3	3	10	0.00911	0.0715	0.526
4	1	5	-11.4	-22.9	-45.5
4	2	5	-0.248	-1.81	-10.07
4	3	5	0.125	0.884	3.93
4	1	10	-5.72	-11.5	-22.9
4	2	10	-0.0317	-0.249	-1.81
4	3	10	0.0159	0.124	0.886