Table 6 Quality control criteria for the FCA of the SA experiment

0

No error—analysis result ok.

1

Time series unsuitable for analysis (signal amplitude too low or interference present)

2

Signal to noise ratio < − 3 dB

3

Fading time >6 _S

4

At least one cross-correlation function maxima lies outside end points

5

Percentage time discrepancy >35 %

6

\( {V}_c^2<0 \)

7

Ground diffraction pattern analysis breaks down

8

Apparent velocity magnitude V _a  > 400 ms^− 1

True velocity magnitude V _t  > 200 ms^− 1

9

Difference between apparent V _a and true V _t direction exceeds 40°.

10

V _a  > 10V _t

11

V _t  > 1.5V _a

12

Poor fit to cross-correlation function (CCF) maximum

13

At least one CCF maximum <0.2

14

Poor zero-lag auto-correlation function (ACF) interpolation

15

Insufficient number of lags on main peak of mean auto-correlation function (MACF) to estimate fading time

16

Poor fit to MACF

17

Secondary maxima in MACF >0.5 (oscillatory)

18

Mean ACF >0.5 at end lags

19

One or more CCF maxima exceeds 1.0