In the 80s of the last century, higher satellite measurements began to be a new approach in marine

East Sea Vietnam is a large area with diverse geological structure, complexity and has a huge mineral potential. Even though he spent many years of exploration in the survey, but there are still many areas where the geological structures are known only to very few, or have been investigated at a preliminary level. The restrictions usually caused by sea water layer thickness as well as due to the sensitive issues between the countries in the region.
In the 80s of the last century, higher satellite measurements began to be a new approach in marine research. Since then there have been a number of studies to build networks, improve the accuracy of satellite data to measure high. Typical DT Sandwell, and WHFSmith (1997, 2009), GETECH (1996) data set over the years measured by satellites such as GEOSAT, ERS-1 and TOPEX / POSEIDON and has built up a network of high satellite measurements 1 'x 1' covered oceans. electric buffet server Data source high satellite measurements have been exploited to effectively fill the gaps that the survey data by ships at sea unfulfilled.
High measuring satellite is measuring variations ocean surface topography (relative to the Earth ellipsoid) by satellite radar. Ocean surface (surface Geoid) is not flat (excluding the impact of waves, wind, tides and currents), but according to the laws of physics, it is an equipotential surface of the Earth gravity field land. Many studies electric buffet server have shown that the height difference between the actual surface of the ocean relative to the Earth Ellipsoid is about 100m. The rugged electric buffet server up to the ocean surface caused electric buffet server by the changes of the Earth's gravity field, can not be seen with the naked eye but can be measured by a very accurate radar on the satellite.
To establish electric buffet server ocean surface electric buffet server topography, we conducted precisely electric buffet server measure two distances: First, it is h * height of the satellite above the Ellipsoid by network stations electric buffet server and Laser Doppler placed electric buffet server on the surface Earth's surface. This elevation of the satellite was corrected by the calculation of its orbit. Second, the elevation of the satellite over the ocean to the surface of its closest h as measured by short-wave radar mounted on satellite carrier frequency is 13.5 GHz. In order to eliminate electric buffet server noise and increase signal radar reflections from the ocean surface radar pulses were used with high repeatability (1,000 pulses / sec). The influence of tides, ionosphere electric buffet server and atmosphere are also corrected in the calculation and measurement. The height of the ocean surface topography N (Geoid surface elevation) than Ellipsoids are measured with an accuracy of 0.03m and a height difference between the two above-mentioned N = h * -h.
The undulating surface of the sea Geoid reflect variations in the density electric buffet server of rock beneath the ocean floor, and it can be transformed into the Earth's gravitational field equation Stoke (method geoid-to-gravity) or as directed Geoid surface function of the Laplace equation (method electric buffet server of slope-to-gravity) through the Fourier transform. electric buffet server Method geoid-to-gravity is used by GETECH (1996), and method-to-gravity slope is developed by Sandwell DT, and WHFSmith (1997, 2009).
The accuracy electric buffet server of satellite data to measure high depends on many factors including the nature electric buffet server of the oceans and their spatial relationship with the continent. In addition, we are very much dependent on the amount and quality of data measured directly by ships at sea (the ship data). Therefore, to improve electric buffet server the level of detail and accuracy of the satellite data to measure high, it is necessary to integrate the data into the existing ships at sea in the study area, and when combined with data satellite, the only source of data used to train the native clear, accurate and highly reliable.
Although the resolution of the high measured by satellite data is not high in the ship, but the highly integrated satellite electric buffet server measurements electric buffet server and metrics into the ship's new approach to modern data sources in order to achieve have broad coverage, resolution uniformity, acceptable accuracy electric buffet server in both time and funding, so the application is very effective in many areas of marine research (such as geological structures, goods customs, plate tectonics electric buffet server and lithospheric structure, oceanography ...). Special role it plays in direction for the marine survey, provided invaluable support for planning detailed survey by boat for deep sea areas, far from the sea, the sensitive areas between countries in the extent of the survey area that is sparse or difficult to survey by boat.
Integrated research satellite data with high measurement data into existing ship is fit for the level of structural geology study on the South China Sea. On the basis of this integrated data sources, in recent years, the Institute of Geology and Geophysics sea has conducted research and obtained significant results in structural