Up C/A Code Processing Down-Converter Correlators L1 ADC Master CLK L1 L1 ACC. ADC C/A L2 Code L2 Down-Converter P1 P2 L2 ACC. Microprocessor P(Y) Code Processing L1 Summation Circuits L2 PC W Down Early Prompt Late P-Code Model Code and Carrier Tracking R C/A Code Generator R W-Chip Different Lags R(.) WF Figure 13. Basic approaches of the reconstructed GNSS-R technique (adapted from [125], [126]). C/A Code Generator L1D y BPF Tc 0 Code and Carrier Tracking ( ) dt Re(.) Extracted in-Phase Components (P & M) Interferometric Processing K.W2 R(.) WF L1R Figure 14. Basic approach of the partial interferometric GNSS-R technique (adapted from [127]). 24 ieee Geoscience and remote sensing magazine december 2014