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Large-scale parallel real-time transmission method and system for Beidou satellite navigation signal

A signal transmission and navigation signal technology, applied in the field of satellite navigation, can solve the problems that the high-speed transmission of navigation signals cannot be realized, and the power of navigation signals cannot be guaranteed.

Inactive Publication Date: 2017-07-07
WUHAN UNIV
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Problems solved by technology

[0005] In addition, Beidou navigation satellites are powered by solar-charged batteries. In addition to ensuring the transmission power of navigation signals at each frequency point, they also need to supply power for other loads of the system. Therefore, the use of large-scale multi-antenna parallel signal transmission branch transmission methods will not Ensure that the navigation signals transmitted by each antenna have sufficient power, and it is impossible to achieve high-speed transmission of navigation signals to meet the needs of users for real-time positioning

Method used

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  • Large-scale parallel real-time transmission method and system for Beidou satellite navigation signal

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Embodiment Construction

[0085] Since the small and medium scale parallel signal transmission branch, large scale parallel signal transmission branch and ultra large scale parallel signal transmission branch realize the same principle in real-time satellite navigation signal transmission technology, for this reason, this example will use the navigation satellite transmitter as the medium and small The realization of the large-scale parallel signal transmission branch system is explained, according to figure 1 The implementation steps are as follows:

[0086] S1 takes satellite parallel signal transmission branches as 4 channels;

[0087] S2 generates a binary satellite navigation message with a length of 24 bits, and divides it into 4 groups, each with 6 bits;

[0088] S3 sends the grouped satellite navigation messages to 1~4 parallel signal transmission branches in turn;

[0089] S4 takes the state variable x of 3 x with different parameters 1 、x 2 、x 3 and sin function with different diffusion ...

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Abstract

The invention discloses a large-scale parallel real-time transmission method and system for a Beidou satellite navigation signal. Large-scale parallel signal transmission branches are built; large-scale grouping is carried out on satellite navigation messages in sequence; the grouped satellite navigation messages are sent to the parallel signal transmission branches successively; a complex shifting pseudo-random code generator is used for obtaining special navigation satellite parallel transmission branch sub ranging code; spectrum spreading is carried out on navigation messages of all branches respectively; modulation is carried out by same carrier waves with different frequency shifts; carrier wave modulation navigation signals of all branches are superposed and noises are added to form a composite satellite navigation signal; the composite satellite navigation signal is emitted by a single antenna; a receiving terminal carries out carrier removing, dispreading, and demodulation on the received navigation signal in a single antenna receiving manner according to branches and thus the navigation message are transformed from a parallel mode into a serial mode; and a navigation message is obtained to realize real-time navigation and positioning of a Beidou satellite navigation system. The large-scale parallel real-time transmission method and system can be applied to a satellite navigation system widely as well as various ranging systems, communication systems, radio and television systems and control systems.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method and system for realizing large-scale parallel real-time transmission of Beidou satellite navigation signals. Background technique [0002] The world's four major satellite navigation systems include the GPS (Global Positioning System) satellite navigation system of the United States, the GLONASS (Global Navigation Satellite System) satellite navigation system of Russia, the Galileo satellite navigation system of the European Union and the BeiDou satellite navigation system of China. Navigation and positioning are realized by providing navigation messages for users. Navigation messages are generally composed of superframes, main frames and subframes. The navigation messages of the Beidou satellite navigation system are divided into D1 and D2 navigation messages: the superframe of D1 navigation messages is 36000 bits ( bits), each superframe is composed of 24 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/02
CPCH04B7/1851G01S19/02G01S19/243H04B1/69H04B7/18513
Inventor 何志彪肖模艳
Owner WUHAN UNIV
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