An Efficient Calculation Method of Multipath Signals in Complex Environment

Abstract

The invention relates to the field of satellite navigation, and provides an efficient calculation method for multipath signals in complex environments, including importing three-dimensional complex scenes, setting boundary conditions for multipath calculations; calculating N sets according to information on triangular surfaces in the scenes; acquiring satellites and the set of visible triangles of the triangles in the scene; obtain the user carrier information and the set of visible triangles of the triangles in the scene; After the surface is connected with the user carrier, a potential multipath reflection path is formed; the multipath point of each triangle in the calculation set is traversed; if the multipath point is located in the enclosed area of ​​the triangle, the multipath exists, and the The path point calculation generates the parameters of the multipath signal. Through the set intersection method, the efficiency of multipath signal simulation in complex environments is greatly improved.

Description

technical field [0001] The invention relates to the field of satellite navigation, in particular to an efficient calculation method for multipath signals in complex environments. Background technique [0002] In the field of satellite navigation, multipath effect has become the main source of error affecting high-precision positioning application scenarios, and multipath simulation based on real scenarios has become more and more important. At present, there are usually two methods for multipath simulation in the industry. One is to impose a fixed delay and attenuation on the basis of the direct satellite navigation signal; the other is to take into account the real environment of the satellite navigation terminal, using The ray tracing method calculates the multipath propagation path of all navigation satellites and satellite navigation terminals, and then calculates the time delay and power attenuation according to the path. [0003] The first scheme does not take into ac...

AI Technical Summary

Problems solved by technology

[0003] The first scheme does not take into account the real geographical environment of the satellite navigation terminal, and the simulated multipath signal cannot actually test and evaluate the performance of the satellite navigation terminal; the second scheme uses the ray tracing method to calculate all multipath propagation paths, However, there is a disadvantage of large amount of calculation. The algorithm complexity of this scheme is proportional to the square of the number of triangles in the real scene. In a complex environment such as an urban environment, the number of triangles contained in a scene is on the order of 100,000 to millions. like figure 1 As shown, the multipath signal of the triangular surface in the complex environment is calculated. For the complex environment, the calculation amount of the scheme is huge, and it cannot meet the needs of real-time simulation calculation. Therefore, the ray tracing scheme is only suitable for the application scenarios with simple scenes or low real-time calculation requirements.

Images