Beidou satellite navigation signal large-scale parallel real-time transmission realization method and system
A signal transmission and navigation signal technology, applied in the field of satellite navigation, can solve the problems that the power of navigation signals cannot be guaranteed, and the high-speed transmission of navigation messages cannot be realized.
Active Publication Date: 2018-04-13
WUHAN UNIV
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[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 in 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, let alone realize the high-speed transmission of navigation messages to meet the needs of users for real-time positioning
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[0087] 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:
[0088] S1 takes satellite parallel signal transmission branches as 4 channels;
[0089] S2 generates a binary satellite navigation message with a length of 24 bytes, divides it into 4 groups, each group has 6 bytes, and forms a 4×6 matrix;
[0090] S3 sends the grouped satellite navigation messages to 1~4 parallel signal transmission branches in turn;
[0091] S4 takes the state variable x of 3 x with different parameters 1 、x 2 、x 3 A set of non-li...
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The invention discloses a Beidou satellite navigation signal large-scale parallel real-time transmission realization method and system. According to the method and system, large-scale parallel signaltransmission branches are constructed; satellite navigation messages are massively divided into different groups according to structures; 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 sub ranging codes for the navigation satellite parallel transmission branches; spectrum spreading is carried out on navigation messages of all the branches respectively; modulation is carried out by same carrier waves with different frequency shifts; the carrier wave modulated navigation signals of all the branches are superposed, and noises are added to the superposed navigation signals, and therefore, composite satellite navigation signals can be formed; the compositesatellite navigation signals are emitted by a single antenna; a receiving terminal carries out carrier removing, dispreading, and demodulation on the received navigation signals in a single antenna receiving manner according to the branches, and thus the navigation messages are transformed from a parallel mode into a serial mode; and the navigation messages are 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 users with navigation messages. The navigation messages of the Beidou satellite navigation system are divided into traditional D1 and D2 navigation messages according to the speed and structure, and B-CNAV1 and B-CNAV2 navigation based on the data block format of the information type. Message: D1 and D2 navigation messages are ...
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IPC IPC(8): H04B7/185
CPCH04B7/1851G01S19/02G01S19/243H04B1/69H04B7/18513
Inventor 何志彪肖模艳
Owner WUHAN UNIV
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