A Spread Spectrum Signal Synchronization Method with Coarse Capture and Fine Capture

A spread spectrum signal, intermediate frequency signal technology, applied in the field of satellite navigation, can solve problems such as signal synchronization, and achieve the effect of improving synchronization accuracy

Active Publication Date: 2015-10-28
ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] In view of this, the present invention provides a method for synchronizing spread-spectrum signals with coarse capture and fine capture, which can solve the signal synchronization problem when receiving discontinuous navigation signals

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  • A Spread Spectrum Signal Synchronization Method with Coarse Capture and Fine Capture

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Embodiment Construction

[0030] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0031] In satellite navigation, the code period is 1ms, corresponding to the CA code in the GPS system, the distance corresponding to 1chip is 300m, the code phase accuracy reaches 0.01chip, the corresponding distance is 3m, and the pseudo code capture accuracy reaches 0.01chip, then the pseudorange The accuracy can reach 3m, which fully meets the positioning requirements. In an implementation method of this method, the step value of the code refinement is 0.01chip, and the precision of the pseudocode can reach 0.005chip (1.5m). The specific implementation method is as follows:

[0032] A kind of spread spectrum signal synchronous method of coarse capture plus fine capture of the present invention, such as figure 1 shown, including the following steps:

[0033] Step 1, determine the carrier Doppler frequency and code phase of the rough capture process: ...

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Abstract

The invention provides a coarse acquisition and fine acquisition spread spectrum signal synchronization method. At first, a carrier wave Doppler frequency and a code phase position are obtained through coarse acquisition, then a Doppler frequency starting frequency deviation is obtained making the carrier wave Doppler frequency as the center and making a Doppler frequency searching stepping value in a coarse acquisition process as a search range of Doppler frequency in a fine acquisition process, a code phase position starting deviation is obtained making the code phase position as the center and making a search stepping value of the code phase position in the coarse acquisition process as a search range of the code phase position in the fine acquisition process of the step, finally incoherent integration results under different Doppler frequency deviations and different code phase position deviations are obtained through searching within the Doppler frequency range and the code phase position range, and signal synchronization is completed according to a Doppler frequency deviation and a code phase position deviation, corresponding to the maximum incoherent integration result. Because the coarse acquisition and fine acquisition method is adopted, synchronization of discontinuous navigation signals can be achieved, and synchronization precision of the signals can also be improved. Therefore, the method can be used for obtaining pseudoranges.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for synchronizing spread-spectrum signals of coarse capture and fine capture. Background technique [0002] There are two main technical fields involved in the present invention, one is a new signal system in the navigation signal enhancement - burst navigation signal, and the other is in the urban environment, due to the complexity of the urban environment, in urban dense urban areas or cities In the canyon area, the satellite navigation signal will be blocked or interfered, which will cause the satellite navigation signal received by the terminal to show discontinuous characteristics and become a discontinuous navigation signal. The common feature of these two fields is that their signals are discontinuous, and we collectively refer to them as discontinuous navigation signals. [0003] Existing navigation signal synchronization algorithms are not suitable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/37G01S19/30
CPCG01S19/254G01S19/29G01S19/30
Inventor 徐颖袁洪袁超何智力
Owner ACAD OF OPTO ELECTRONICS CHINESE ACAD OF SCI
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