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Phase discrimination method for suppressing multipath signals in global navigation satellite system

A technology of global navigation satellite and multipath signal, applied in the field of global navigation satellite system, can solve the problem of serious application of short delay multipath and so on

Active Publication Date: 2014-11-05
SHANDONG GUANGAN ELECTRONICS SCI & TECH CO LTD
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Problems solved by technology

[0003] Multipath is one of the main sources of error in GNSS, and although various multipath reduction and delay estimation techniques have been developed, the application of short-delay multipath in high-precision, indoor and dense urban environments is still serious

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  • Phase discrimination method for suppressing multipath signals in global navigation satellite system
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  • Phase discrimination method for suppressing multipath signals in global navigation satellite system

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Embodiment Construction

[0013] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0014] The embodiment of the present invention proposes a phase detection method for suppressing multipath signals in GNSS signals. In the code tracking loop of the GNSS signal processing process, after obtaining the cross-correlation power of multipath signals, the method based on the precise TK sampling interval is adopted. The phase detection method can effectively suppress multipath signals, and can achieve the purpose of improving the accuracy of the GNSS receiver.

[0015] Such as figure 1 As shown, the GNSS signal receiver is mainly composed of antenna, RF front-end, high-speed analog-to-digital converter, FPGA correlator, DSP digital signal processor and memory. figure 2 The flow chart of the method for receiving high-precision GNSS signals provided in t...

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Abstract

The invention discloses a phase discrimination method for suppressing multipath signals in the global navigation satellite system and belongs to the technical field of global navigation satellite systems. The method includes: receiving GNSS (global navigation satellite system) signals containing the multipath signals and performing analog-digital conversion after down-conversion is performed to generate low-intermediate frequency signals; and performing carrier stripping for the GNSS signals subjected to the analog digital conversion to obtain signals of a path I and a path Q and performing code stripping for the signals of the path I and the path Q. In a code tracking loop during GNSS signal processing, after cross-correlation power of the multipath signals is obtained, the multipath signals can be suppressed effectively by adopting the phase discrimination method based on precise TK (teager-kaiser) sample intervals, and precision improvement of a GNSS receiver can be achieved.

Description

technical field [0001] The invention relates to the technical field of the global navigation satellite system, in particular to a phase detection method for suppressing multipath signals in the global navigation satellite system. Background technique [0002] In the application of Global Navigation Satellite System (GNSS, Global Navigation Satellite System), the improvement of receiver performance is the premise of promotion and application industry. In order to improve the receiving performance of the navigation signal, it is necessary to filter out the multi-path signals coming from different reflectors or multiple reflections. In fields such as surveying and mapping, technologies such as choke coils and narrow correlation are often used to suppress multipath signals; while in fields such as remote sensing, a left-handed antenna specially used to receive reflected signals is used to process the received reflected signals, and then the ocean, land, etc. Conduct remote sens...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/22
Inventor 杨东凯刘德荣李伟强张波
Owner SHANDONG GUANGAN ELECTRONICS SCI & TECH CO LTD
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