Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Three threshold function airspeed data denoising evaluation index value
| Denoising Evaluation Index | Soft threshold | Hard Threshold | Improved Threshold Function |
|---|---|---|---|
| SSE | 3046.4 | 2721.5 | 2477.4 |
| NCC | 0.985 | 0.988 | 0.990 |
Improved threshold function wavelet construction method experimental effect evaluation form
| Algorithm evaluation index | Engine Speed | Airspeed | Temperature Data | Humidity Data |
|---|---|---|---|---|
| SSE | 462060 | 24774 | 24.682 | 21.835 |
| NCC | 0.998 | 0.989 | 0.978 | 0.810 |