Sea High-Level Determination using Pseudorange Range Difference of Carrier Phase and Code between GPS Reflection and Directly Signal

The GNSS signal reflection technique at the tide station can provide accurate results and is more far-reaching from the coast to the sea, it is possible to provide real-time sealevel information including high wave and tsunami. With the use of two receivers with two antennas, one facing upwards as a direct signal receiver and a second antenna facing downwards as a signal receiver of reflection can be obtained both phase data and GNSS signal codes from both direct and reflected signals. With the different methods of signal trajectory that propagates directly and propagates through reflection by sea level, it can be determined the difference in distance between the master and the shadow rover receivers. The sea level can be determined which is half the distance between the two receivers. In this paper, the results of the data analysis of the different trajectory distances of GNSS signals from code data are presented, from the simplest one, namely a GNSS satellite is assumed to have a linear relationship with the satellite elevation angle with a gradient proportional to sea level. The computation results show that the reflected signal data is suspected not only from sea level but originating from the surrounding environment. It is necessary to experiment with the reflected signal in an area that ensures that the signal is only reflected once by sea level or other reflected plane.