Adquisición de señales GNSS-R: Método de Integraciones Cortas

The acquisition of reflected GPS signals on the ocean requires a high sensitivity receiver, high receiving antenna gain and averaging over a long period of time because of their low power. Typically, the receiver integrates 1 ms of signal coherently and averages 1000 of these results non-coherently, using a total signal time of 1 second to generate 1 delay-Doppler map, which is used to retrieve information about the state of the ocean. In this work an alternative method is presented that proposes using a shorter integration time in the partial correlations. By doing so, a larger number of integrations is available to be averaged in order to generate 1 map within the same total signal time. Theoretical results, obtained through a stochastic model of the signals, are presented and suggest a possible gain in the method compared to the 1 ms integration time case. That gain and the fidelity of the model are verified using real signals from the European Space Agency mission, TechDemoSat-1.