Table 1 Parameters estimation for each navigational points. The centroid frequency of the received radar signal, the drift slope of the centroid frequency, the derived loss tangent, and the derived TiO2 + FeO contents at different segments of the LPR data. The uncertainties for all the estimated values are the 95% confidence bounds. The navigation points are shown in Figs. 1c and 5b
LPR segments | Centroid frequency (ft, MHz) | Frequency drift rate (\( \Delta {f}_r \),MHz/ns) | Loss tangent (tanδ) | TiO2 + FeO (wt.%) |
|---|---|---|---|---|
N105–N106 N106–N107 N107–N108 N108–N202 N202–N203 N203–N204 N204–N205 N205–N206 N206–N207 N207–N208 | 504.75 ± 1.22 502.10 ± 1.58 496.52 ± 1.70 510.37 ± 1.40 505.30 ± 1.31 501.44 ± 1.41 498.57 ± 1.38 495.11 ± 2.28 497.40 ± 1.30 501.24 ± 1.74 | − 1.623 ± 0.043 − 1.661 ± 0.059 − 1.217 ± 0.066 − 1.653 ± 0.047 − 1.219 ± 0.040 − 1.079 ± 0.044 − 1.128 ± 0.042 − 1.152 ± 0.071 − 1.107 ± 0.043 − 1.536 ± 0.070 | 0.0162 ± 0.0004 0.0168 ± 0.0005 0.0126 ± 0.0006 0.0162 ± 0.0004 0.0122 ± 0.0003 0.0109 ± 0.0004 0.0116 ± 0.0004 0.0120 ± 0.0006 0.0114 ± 0.0004 0.0156 ± 0.0006 | 29.54 ± 0.33 30.02 ± 0.44 22.58 ± 0.70 29.48 ± 0.35 25.36 ± 0.41 23.82 ± 0.52 24.63 ± 0.47 25.13 ± 0.77 24.42 ± 0.50 28.94 ± 0.58 |