GPS ocean altimetry from aircraft using the P(Y) code signal

Contributions to GNSS-R earth remote sensing from nano-satellites

“…Since then, several additional theoretical work modeling the expected signal waveform and accuracy have appeared (e.g [15][16][17]). Experimental campaigns to characterize GPS altimetry from a fixed location over a lake [18], from an aerostatic balloon over a lake [19], and from an airborne platform [20][21][22][23][24], have been conducted. The first GPS reflections from space were detected from the analysis of the data collected during Space-borne Imaging Radar-C (SIR-C) mission on board the Space Shuttle [25].…”

“…S. Lowe et al performed a cGNSS-R experiment using the encrypted P(Y) GPS code, but not in real time[20], and B. Wilmhoff et al employed the encrypted P(Y) code to perform a real time experiment over the sea[23].…”