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Method for acquiring navigation satellite signal by using chaotic system

A chaotic system and navigation satellite technology, which is applied in the field of navigation satellite signal acquisition to achieve the effect of improving sensitivity

Inactive Publication Date: 2013-04-03
BEIHANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] However, the above-mentioned prior art only utilizes the chaotic system to detect the existence of the perturbation small signal

Method used

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  • Method for acquiring navigation satellite signal by using chaotic system
  • Method for acquiring navigation satellite signal by using chaotic system
  • Method for acquiring navigation satellite signal by using chaotic system

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Embodiment Construction

[0020] The specific implementation manner of the present invention will be described in detail below in conjunction with the accompanying drawings, and the description will take capturing a weak GPS signal as an example.

[0021] The Duffing equation is a nonlinear elastic system motion equation, which can describe the chaotic motion. Under the action of periodic external force, the Duffing equation is:

[0022]

[0023] Fix δ, ω, and make γ increase from small to large, and the system will go through various states such as homoclinic orbit, bifurcation, chaos, and large-scale cycles. Such as figure 1 , figure 2 , the phase diagrams of the system in the chaotic state and the large-scale periodic state are given respectively. The inventors of the present application consider that in order to detect weak signals, adjust γ to an appropriate value, so that the system is just in the critical state between the chaotic state and the large-scale periodic state. At this time, in...

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Abstract

The invention provides a method for acquiring a navigation satellite signal by using a chaotic system. The navigation satellite signal comprises a ranging code. The method comprises the following steps of: A, keeping the chaotic system in a critical state between a chaotic state and a large-scale periodic state; B, correlating the navigation satellite signal with a local signal, transmitting the navigation satellite signal to the chaotic system, and acquiring a phase of the ranging code of the navigation satellite signal by judging whether the chaotic system is subjected to phase change, wherein the local signal is a copy code of the ranging code; and C, continuously inputting the correlated signal which makes the chaotic system subjected to the phase change, finding an intermittent chaotic period by searching at least three phase change points of the chaotic system, and further solving a frequency of the navigation satellite signal. In the method, a weak signal in the background of astrong noise is acquired by sensitivity on parameters of chaotic motion. Compared with the conventional method, the method provided by the invention has the advantage that detection sensitivity is improved greatly.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 200810240061.X. technical field [0002] The invention relates to the field of navigation satellite signal capture, in particular to a method for capturing navigation satellite signals by using a chaotic system. Background technique [0003] In recent years, satellite navigation systems have been more and more widely used. The general-purpose satellite navigation receiver can easily perform three-dimensional positioning and achieve high positioning accuracy. However, under harsh positioning environments such as indoors, forests, city centers, and tunnels, the navigation satellite signal is severely attenuated, and the power of the navigation satellite signal is far lower than the working range of the general receiver. If the signal of the navigation satellite cannot be captured in the environment, tracking and positioning cannot be performed. In order to break the limitations of this appl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/30
Inventor 秦红磊金天张骅
Owner BEIHANG UNIV