Table 5 Comparison of image entropy of motion compensation methods under 35 dB noise environment.

From: Enhanced range doppler mapping algorithm for passive GNSS based radar aerial target detection

Code

State

B channel entropy

G channel entropy

R channel entropy

Average

GPS

Before noise reduction

2.16

1.85

1.50

1.84

After carrier phase compensation

4.91

4.82

3.36

4.36

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