KEYWORDS: Global Positioning System, Satellites, Visualization, Receivers, Binary data, Data communications, Data transmission, Satellite navigation systems, Data storage, Reliability
In order to avoid rework and improve the efficiency of GPS static observation, it is very important to control the quality of GPS data in real time. On the basis of analysis of observation data decoding and observation data quality indices, a new program was compiled for decoding the original observation data and calculating and analyzing the quality indices such as the multipath effect and cycle slips etc. and the quality indices can be displayed intuitively by graphics in realtime. Moreover, the experimental verification is carried out with the engineering practice, and the results proved the correctness and reliability of the designed software RTQC, which can provide guidance and help for the practical work.
GPS has been used successfully to determine attitude for a moving platform. A direct calculation method of real-time attitude determination using three-antenna system for the moving platform is described. Since real-time integer ambiguity resolution for baseline vectors is a key process for a high accuracy real-time attitude determination, the ambiguity resolution method and validation test procedure epoch-by-epoch are proposed based on the special property of the three-antenna system. Simulation study results are presented in this contribution showing that better than one degree accuracy of the platform attitude can be achieved using the proposed method.
Vegetation Supply Water Index (VSWI) and Temperature Vegetation dryness Index (TVDI) are two most commonly used methods for surface soil moisture (SSM) retrieval using electromagnetic spectrum of visible, near infrared and thermal infrared band. Both of them take into account the effect of vegetation index (VI) and surface temperature (Ts) on SSM. A comparative analysis of the ability and effect of the two methods for SSM retrieval in karst areas was carried out, using the remote sensing data of Landsat 8 OLI_TIRS. The study area is located in Guilin, which is a typical karst area. The experimental results show that TVDI is more suitable for SSM retrieval in karst areas.
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