Table 5 DFT estimation results with different lengths of data window
Parameter | True value | Different lengths of data window | ||
|---|---|---|---|---|
2 s | 3 s | 4 s | ||
Amplitude A1 (A) | 10 | 10.0917 | 9.9904 | 10.0677 |
Frequency f1 (Hz) | 50 | 50.000 | 50.000 | 50.000 |
Phase φ1 (rad) | − π/4 | − 2.3562 | − 2.3562 | − 2.3562 |
Amplitude A2 (A) | 0.2 | − | − | 0.1417 |
Frequency 2sf1 (Hz) | 0.4 | − | − | 0.5000 |
Phase φ2 (rad) | π/2 | − | − | 1.3516 |
Amplitude A3 (A) | 0.2 | − | − | 0.1423 |
Phase φ3 (rad) | π | − | − | 2.7031 |