GPS信噪比用于潮位變化監(jiān)測研究
[Abstract]:Sea level change directly affects the evolution of global weather and long-term climate, which is one of the important issues of environmental science. At the same time, sea level change is also an important part of geodynamics, dynamic geodetic surveying and marine surveying and mapping research. It is related to the unification of the global elevation datum and the importance of modern SPATIAL GEODETIC technology. With the continuous research and application of GNSS (Global Navigation Satellite System), GNSS-MR (Global Navigation Satellite System Multipath Reflectometry) inversion technology based on multipath effect (Global Navigation Satellite System) is used for surface environmental monitoring (vegetation, soil moisture, snow depth, sea level, volcano, etc.) and has become a new remote sensing hand. From the relationship between GPS multipath and signal-to-noise ratio, this paper studies the theory and method of monitoring water surface change by GPS-MR technology, and obtains the regional average sea surface based on GPS-MR technology, and verifies the feasibility of monitoring sea level change by GPS signal-to-noise ratio. The main contents and innovation points of this paper are as follows: 1. the reasons of GPS multipath generation are explored. The space-time characteristics and the influence on the design of the GPS antenna are studied. The polarization mode of the GPS reflection signal and the reflection coefficient of the reflector are studied. The concept of the GPS signal to noise ratio is given. The characteristics and the influence factors of the signal to noise ratio sequence are analyzed. On this basis, the relationship between the GPS multiplex diameter effect and the signal to noise ratio is analyzed in detail, and the low altitude angle is pointed out. The lower signal-to-noise ratio (SNR) (Signal-to-Noise Ratio) is seriously affected by multipath, and the multipath effect of GPS will directly affect the change of the signal to noise ratio of GPS. Therefore, the surface environment parameter.2. that causes GPS multipath reflection can be obtained through the spectrum analysis of SNR, and the function model of the water level detection based on the signal to noise ratio observational value GPS-MR technology is studied and the signal to noise is used. The extraction method of the residual sequence and the selection of the effective satellite arc are discussed. The standard of determining the validity of the vertical reflection distance from the LSP (Lomb-Scargle periodogram) spectrum analysis is proposed. Through the theory of the Finel reflection area, the range of the inversion of the tidal level is analyzed by the GNSS station. By an example, the GPS-MR technique is used for the lake surface. The water level of the tidal diurnal variation is retrieved respectively. The validity of the GPS-MR technology applied to the monitoring of the water level change is verified. The reasons for the different inversion accuracy of the GPS-MR technology are also analyzed. It is proved that the shore based CORS (Continuously Operating Reference Stations) station can be used as a tide test to some extent. The supplement.3. introduces the basic theory of ocean tide and regional average sea surface water surface acquisition, and gives the method of obtaining the average sea surface of the region by GPS-MR technology. Through an example analysis, it is proved that the GPS-MR technology has high precision in obtaining the average sea surface surface of the region and exerts the application value of the shore base CORS station in the sea level change monitoring.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:P228.4;P229
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