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Table 9 The signal-to-noise ratio of the mixed signal is improved after PCA noise reduction

From: RETRACTED ARTICLE: Recognition method of radar intra-pulse modulation type based on signal square spectrum bandwidth ratio

Signal

BPSK + QPSK

BPSK + 2FSK

BPSK + LFM

QPSK + 2FSK

QPSK + LFM

2FSK + LFM

Reconstruction degree = 98%

0.4–2.1

0.5–1.9

0.6–2.1

0.7–2.3

0.5–2.4

0.8–2.4

Reconstruction degree = 94%

1.1–3.2

1.3–3.4

1.5–3.3

2.0–3.7

1.8–3.5

1.6–3.8

Reconstruction degree = 90%

2.4–4.6

3.4–5.1

3.4–4.9

2.5–4.85

2.4–5.2

2.5–4.7

Reconstruction degree = 86%

2.6–4.3

3.5–4.9

3.1–4.6

2.7–4.3

2.3–4.8

2.3–4.5