Identification and positioning method and system for acquiring arrival angle of wireless signal by intelligent antenna

Abstract

The invention belongs to the technical field of wireless positioning navigation, and discloses an identification and positioning method and a system for acquiring an arrival angle of a wireless signalby an intelligent antenna. The method comprises the following steps: carrying out a phase synchronization processing on received array data; solving an actual signal initial arrival angle by methodssuch as Orthogonal Matching Pursuit (OMP); carrying out a more accurate signal arrival angle estimation on a preliminary estimation value of the arrival angle by using a neighboring angle power difference method so as to perform positioning; after an accurate arrival angle is obtained for the first time, obtaining an initial arrival angle of a next position state by using beam forming, and carrying out continuous estimations and positioning of high-accuracy arrival angles by using an Auto Astro Position Device (AAPD). The identification and positioning method and the system for acquiring the arrival angle of the wireless signal by the intelligent antenna have the advantages that estimation precision of an arrival angle of a target wireless signal can be effectively improved under the conditions of low signal-to-noise ratio and less receiving end array element number; and estimation errors caused by multipath are suppressed, thereby achieving an algorithm with strong stability and highfeasibility, and improving related positioning precision.

Description

technical field [0001] The invention belongs to the technical field of wireless positioning and navigation, and in particular relates to a method and system for identifying and locating angles of arrival of wireless signals acquired by a smart antenna. Background technique [0002] The global positioning system (GPS) of the United States, the Beidou positioning system of my country, the GLONASS system of Russia and the Galileo system of Europe belong to the wireless positioning system based on satellites. widely used. However, in important scenarios such as the civil field with great development potential at present, it is difficult for the positioning system to form positioning when it is physically blocked by buildings, especially in indoor environments, where such signals cannot be covered and the positioning effect is poor. With the development of IEEE802.11 wireless network communication protocol, the latest development standard adopts OFDM signal as the main signal, an...

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Problems solved by technology

[0005] (1) The existing satellite navigation and positioning system is difficult to form positioning under the condition of physical occlusion such as buildings, especially in the indoor environment, the signal cannot be covered, and the positioning effect is poor

[0006] (2) The existing algorithms based on correlation matrix eigendecomposition are very sensitive to noise, and the effect will be significantly improved when the signal-to-noise ratio is high, which means that in daily applications, low signal-to-noise ratio and multipath less effective in severe cases

[0008] The wireless signal is seriously interfered by multipath, which seriously affects the accuracy of positioning and navigation

In the field of multi-antenna angle measurement and positioning, the existing angle-of-arrival estimation methods are easy to be affected by the environment and cause erroneous estimates when the signal-to-noise ratio is low, especially when there will be obvious error jitter during the movement process. The main influencing factors restricting high-precision angle measurement and positioning in the process of movement

At present, there is no method that can effectively control the error jitter

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