Research on the calculation method of the geographical coordinates of the operation area under the background of precise target spraying
[Objective]Determining the geographic coordinates of the operation area is one of the key problems for the implementation of precision target spraying by UAV.If there are many operation areas to be sprayed or the operation areas to be sprayed are paddy fields,etc.,the traditional manual point-by-point measurement method in the field has the disadvantages of large workload,cumbersome measurement steps,and difficult access to the measurement area.Therefore,the geographic coordinates of a limited number of locations located at the boundary or outside the boundary of the operation area are measured,and then the geographic coordinates of each operation area are calculated according to a certain algorithm,which will overcome the above disadvantages and have great practical application value,and will greatly improve the efficiency and application of precision target spraying.[Method]According to the solving requirements of the geographic coordinates of the operation area for precision target spraying,a method for obtaining the relative position of ground points is found in surveying.At the same time,this method is introduced and improved.Two algorithms for calculating the geographic coordinates of the operation area are proposed,which are based on the geometry method assuming that the earth is a sphere and the projection method assuming that the earth is an ellipsoid.[Result]The experiments show that the errors of the two algorithms are in the range of centimeters compared with the measured value,which meets the requirements of precision spraying on the target.In terms of solving speed,the geometric method is faster than the projection method.In terms of solving complexity,the geometric method is better than the projection method.[Conclusion]The two algorithms proposed in this paper to solve the geographic coordinates of the operating cell-the geometric method and the projection method can meet the requirements of precision spraying on the target in terms of precision.However,in the process of solving the geographic coordinates of the operating cell using the two algorithms respectively,it is found that in terms of calculation complexity and calculation speed,the geometric method is better,simpler and more suitable for solving the geographic coordinates of the operating cell when implementing precision spraying on the target.
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