Method for optimizing spreading codes of navigation signals

A technology of navigation signal and spread spectrum code, applied in the field of satellite navigation, can solve the problem that the code length of the code set to be optimized cannot directly take the target code length, etc., and achieve the effect of improving performance

Active Publication Date: 2015-04-15
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 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 and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, 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 constitute a conflict with each other.

[0027] The embodiment of the present invention overcomes the deficiencies in the prior art, and provides a method for optimizing the spread spectrum code of navigation satellites. and the maximum parity autocorrelation sidelobe to determine the truncation point, and further optimize according to the maximum parity autocorrelation sidelobe, interference parameters, maximum spectrum amplitude, and...

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Abstract

The present invention relates to the technical field of satellite navigation. Disclosed is a method for optimally selecting spreading codes for navigation signals. The method comprises: when the code length of a code set to be optimally selected is not equal to a target code length, determining a truncation point by calculating the balance and the maximum odd-even autocorrelation sidelobe of a truncated code; and conducting further optimal selection according to the maximum odd-even autocorrelation sidelobe, interference parameters, the maximum spectrum amplitude and the maximum odd-even cross-correlation. Compared to the prior art, the present invention provides more flexible selection of code length, more practical consideration of odd correlation, and obtains spreading codes of better performance, thus improving the performance of a satellite navigation system without changing the software and hardware design scheme for the satellite navigation system and without increasing the system construction cost.

Description

technical field [0001] The invention belongs to the technical field of satellite navigation, and more specifically relates to a preferred 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 spread spectrum code in the navigation signal, and the acceleration of the interoperability process in the field of civilian signals makes the difference between different satellite navigation systems The interoperable signals between different systems adopt the modulation method with the same power spectrum characteristics, so the isolation of interoperable signals between different systems depends on the spread spectrum code, so the research on the improved spread spectrum code optimization method can improve the navigation system performance and system compatibility. ...

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Application Information

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Patent Type & Authority Patents(China)
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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