Power waveforms analysis of GNSS-R delay signals from beidou GEO satellite

GNSS remote sensing can play an important rule for monitoring the earth's surface. For this why, this technique is proposed to retrieve some information from water surface. Specifically, scattered signals from the ocean surface can provide significant information of water surface and its current condition. In this paper, direct and scattered power waveforms of GEO Satellite of Beidou are mainly focused and analyzed. Due to delay of reflected signal, the waveforms pattern & characteristics are clearly different from direct signals. These power waveforms are determined for different coherent integration times, different wind speeds and different satellite elevation angles. Z-V scattering model and Tanos Elfouhaily wave spectrum model are utilized to present the power waveforms of reflected signals and these waveforms are compared with the power waveforms of reflected & direct signals of real data. It is observed that these waveforms are sensitive to integration time, wind speed and satellite elevation angle. It is also found that the waveforms are directly related to these three parameters (time, wind speed & elevation angle). As a result, the model waveforms and real data waveforms have performed a good matching each other.