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

Table 1

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

System order	Expansion order	Observation bandwidth	Magnitude errors at 0.2 rad/s (dB)	Magnitude errors at 0.4 rad/s (dB)	Magnitude errors at 0.8 rad/s (dB)
3	1	5	-0.0277	-0.111	-0.44
3	2	5	0.135	0.506	1.6
3	3	5	0.00232	0.0361	0.485
3	1	10	-0.00695	-0.0277	-0.111
3	2	10	0.0346	0.135	0.506
3	3	10	0.000148	0.00232	0.0361
4	1	5	-0.0347	-0.139	-0.55
4	2	5	0.201	0.736	2.18
4	3	5	0.00461	0.071	0.902
4	1	10	-0.0087	-0.0348	-0.139
4	2	10	0.0516	0.202	0.735
4	3	10	0.000292	0.00462	0.0711