Multi-path prediction method for three-dimensional scene navigation signal
A technology of three-dimensional scene and prediction method, which is applied in the direction of measuring device, radio wave measurement system, satellite radio beacon positioning system, etc., and can solve problems such as poor accuracy
Inactive Publication Date: 2016-03-02
NORTHWESTERN POLYTECHNICAL UNIV
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[0004] In order to overcome the deficiency of poor accuracy of the existing navigation signal multipath prediction method, the present invention provides a three-dimensional scene navigation signal multipath prediction method
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[0044] refer to Figure 1-3 . The specific steps of the three-dimensional scene navigation signal multipath prediction method of the present invention are as follows:
[0045] Step 1. Searching based on reflective surfaces and diffractive prisms of the 3D scene.
[0046] First, a three-dimensional scene model is established. Taking an urban scene as an example, buildings are characterized by geometric parameters and electrical parameters. It can be seen that satellite positions and speeds are calculated by ephemeris and receiving point coordinates.
[0047] Secondly, with the transmitting source (satellite) / receiving source (receiver) as the center, scan horizontally and then vertically to obtain visible reflecting walls and visible diffraction edges as the first-level virtual source;
[0048] Then, traverse all the reflective surfaces and diffraction edges in the first-level virtual source in turn, and scan again in the visible area to determine all the second-level virtual...
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The invention discloses a multi-path prediction method for three-dimensional scene navigation signals and solves a technical problem of poor precision existing in a navigation signal multi-path prediction method in the prior art. According to the method, a three-dimensional scene model is established, an emission / reception source is taken as a center, reflection wall faces and visible diffraction ribs are acquired through scanning and are taken as first-level virtual sources; all reflection faces and diffraction ribs in the first-level virtual sources are sequentially traversed, scanning in the visible area is carried out another time to determine all second-level virtual sources of reflection sources; all virtual sources are found and are stored in a tree structure. Through the method, on the basis of establishing the three-dimensional scene model, actual positions of a satellite and a receiver are utilized to carry out reflection ray tracking, through solving reflection / diffraction paths and signal intensity, multi-path navigation parameters including time delay, frequency shift, fading and phase shifting are accurately predicted finally.
Description
technical field [0001] The invention relates to a navigation signal multipath prediction method, in particular to a three-dimensional scene navigation signal multipath prediction method. Background technique [0002] With the development of satellite navigation systems, its receivers have been integrated into many devices to provide high-precision timing and positioning. The application range of satellite navigation systems has expanded to all aspects of human production and life, and more requirements have been put forward for its performance. , where the further demand for precision requires us to explore various error sources of satellite navigation systems and methods to weaken their influence. Multipath is a major source of errors in satellite navigation systems, which can cause serious damage to navigation and positioning systems. [0003] Document "3DEnvironmentModelingforGPSMultipathDetectioninUrbanAreas[C]9 th International Multi-conference on Systems, Signals and...
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CPCG01S19/22
Inventor 郭淑霞张磊高颖王亚锋陈旭于学伟董文华刘瑞兵李瑛
Owner NORTHWESTERN POLYTECHNICAL UNIV