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Method for generating spread spectrum code in satellite navigation system

A satellite navigation system and a spread spectrum code technology, which is applied to the generation field of spread spectrum codes in satellite navigation systems, can solve the problems of long time consumption, increased satellite burden, limited number of code groups, etc. definite effect

Inactive Publication Date: 2011-02-09
SHANGHAI JIAO TONG UNIV
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  • Description
  • Claims
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Problems solved by technology

However, this method is not suitable for real-time generation on the satellite, and it needs to be stored on the satellite in advance, which increases the burden on the satellite; and the whole process takes a long time, and the number of generated code groups is limited

Method used

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  • Method for generating spread spectrum code in satellite navigation system
  • Method for generating spread spectrum code in satellite navigation system
  • Method for generating spread spectrum code in satellite navigation system

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Embodiment Construction

[0033] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0034] Such as Figure 1-Figure 2 As shown, this embodiment includes the following steps:

[0035] In the first step, when the length q of the code to be spread is a prime number, generate a Legendre sequence with a length of q and a Weil sequence with a length of q to obtain (q-1) / 2 groups of Weil sequences with a length of q , go directly to the third step;

[0036] Otherwise, generate a Legendre sequence with a length of p and a Weil sequence with a length of p to obtain (p-1) / 2 sets of Weil sequences with a length of p, where: p is less than q and p is the closest prime number to q , perform the second step....

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Abstract

The invention provides a method for generating a spread spectrum code in a satellite navigation system in the technical field of information processing. In the method, a spread spectrum code is subject to Legendre sequence generation processing and Weil sequence generation processing to acquire a spread spectrum code sequence, and the spread spectrum code sequence is subject to judgment of even cross-correlation and odd cross-correlation to acquire a required spread spectrum sequence. Based on the Weil sequence generation spread spectrum code, the method realizes the requirement of the satellite navigation system to the spread spectrum code, and has the advantages of great number of generation code sequences and good cross-correlation character of the sequence.

Description

technical field [0001] The invention relates to a method in the technical field of information processing, in particular to a method for generating spreading codes in a satellite navigation system. Background technique [0002] The spread spectrum code in the satellite navigation system signal can enhance the anti-noise ability of the navigation signal and help users quickly distinguish different satellites, so it plays an important role in the signal system design of the satellite navigation system. Due to the good randomness between the spreading code chips, but the generation of the codes has certain rules and is not really completely random, so the spreading code is also called a pseudo-random code. The C / A code based on the gold sequence is the satellite navigation signal spreading code of the world's first satellite navigation system - GPS (Global Positioning System, Global Positioning System), as the spreading code of the code division multiple access satellite naviga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/01H04B1/707
Inventor 战兴群牛满仓翟传润张炎华杜刚刘卫刘莉
Owner SHANGHAI JIAO TONG UNIV
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