Research on Measurement Accuracy of Area Measuring Instrument Combined with GPS
In recent years, the development of mobile computing and remote sensing technology, and the continuous maturity of GPS technology, the application of various industries is constantly deepening, providing strong technical support for the use of embedded development of location-based geographic information services. The state is implementing a digital strategy that requires various industries to achieve information and digitalization, such as digital cities, digital transportation, digital forestry, and intensive farming. In these areas, remote sensing, GPS satellite positioning and other technologies are used to obtain information, and GIS systems are used to store and process information. With the help of computer networks and communications, information processing and analysis are finally achieved, decision-making basis is provided, and information is transmitted in real time. The area measuring instrument plays a very important role in the measurement of agricultural area, and the related results obtained are also accurate and reliable.
The area measuring instrument adopts GPS single point positioning to determine the coordinates of the sub-group boundary points, and the principle is the same as the distance rendezvous in the measurement distance. The position of the GPS satellite in the air is known at any moment. As long as the star source is used to observe 4 satellites in the air at the boundary feature of the subclass, the distance (the pseudorange) from the observation instant to the point to be measured can be calculated. The coordinates of the point to be measured. Because GPS satellites operate independently in the air, the GPS time of each satellite is corrected to become a unified UTC time. Ground users can open Star Sources to observe and locate anytime, anywhere. The distance from the punctual point observed by Starsource to the satellite is not the actual distance, which includes the error caused by the satellite clock and the satellite receiver's clock skew.
The accuracy of the area measuring instrument is affected by many factors such as the GPS positioning error, the size of the plot, the shading of the forest and the mountains. If the Xingyuantong Palm Forest Surveyor can accept more than 4 satellites, it can effectively locate and complete the area measurement. When the plot area is less than 600m2, the area measurement error will exceed 5%. The smaller the parcel, the greater the relative error. Canopy closure affects the reception of GPS signals, which in turn affects area measurements. When equipped with micro-antennas, Xingyuantong can be positioned smoothly in woods with close to 1 degrees of cactus without affecting the accuracy of area measurement. The effect of the mountain on satellite signals is an issue that cannot be overcome by any GPS device. In the Grand Canyon, because of the inability to receive signals from 4 satellites, this product, like other products, is difficult to locate and measure.
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