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Method for optimizing spreading codes of navigation signals

A navigation signal and spreading code technology, applied in the field of satellite navigation, can solve the problem that the code length of the code set to be optimized cannot be directly obtained from the target code length, and achieve the effect of improving performance

Active Publication Date: 2014-02-12
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

This method only describes the situation that the code length of the code set to be optimized is equal to the code length of the target code set, but in practical applications, the code length of the code set to be optimized often cannot be directly obtained from the target code length

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  • Method for optimizing spreading codes of navigation signals
  • Method for optimizing spreading codes of navigation signals
  • Method for optimizing spreading codes of navigation signals

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[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] The embodiment of the present invention overcomes the shortcomings of the prior art and provides a method for optimizing the spreading code of navigation satellites. The method includes the case that the code length of the code family to be optimized is not equal to the target code length, and the balance of the truncated code is calculated The truncation point is determined based on the maximum...

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Abstract

The invention belongs to the technical field of satellite navigation and discloses a method for optimizing spreading codes of navigation signals. According to the method, under the condition that the code length of a spreading code set to be optimized is unequal to the target code length, cut-off points are determined by calculating the balance of shortened codes and the maximum odd-even self-correlation sidelobe, and according to the maximum odd-even self-correlation sidelobe, interference parameters and the maximum spectrum amplitude, the maximum odd-even self-correlation is further optimized. Compared with the prior art, the method for optimizing the spreading codes of the navigation signals has the advantages that the selection of the code length is free, consideration of odd correlation more accords with the practical application situation, the spreading codes with the better performance can be obtained, and the performance of a satellite navigation system is improved on the conditions of not changing the software and hardware design scheme of the satellite navigation system and not increasing the construction cost of the system.

Description

Technical field [0001] The present invention belongs to the technical field of satellite navigation, and more specifically, relates to an optimal method for spreading codes of navigation signals. Background technique [0002] In the satellite navigation system based on code division multiple access, the user receiver distinguishes the signals of different satellites and performs navigation and positioning through the spreading code in the navigation signal. The acceleration of the interoperability process in the field of civil signals makes the difference between different satellite navigation systems Interoperability signals between different systems use modulation methods with the same power spectrum characteristics. Therefore, the isolation of interoperable signals between different systems depends on spreading codes. Therefore, research on improved spreading code optimization methods can improve navigation system performance and system compatibility. It plays an important rol...

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Application Information

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IPC IPC(8): H04B1/707G01S19/30
CPCH04B1/707G01S19/02H04J13/0003
Inventor 唐祖平魏蛟龙夏轩石建峰
Owner HUAZHONG UNIV OF SCI & TECH
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