Optimization Design Of GNSS Pseudo-random Code

Global Navigation Satellite System (GNSS) to provide positioning, velocity andtiming services, has become an important part of agriculture, everyday applications, aswell as military applications.Due to the success of the U.S. GPS system, countries are nowincreasing emphasis on building its own satellite navigation system.In addition to U. S.GPS System has been built, the European Galileo system, China Compass system, and theRussian GLONASS system is gradually established and improved. there will be moreGNSS can provide us with a better service before long.The satellite navigation system uses direct sequence spread spectrum(DSSS),whichusing the spreading code. The choice of spreading codes is particularly important for theGNSS, on the one hand, pseudo-code noise(PRN) code can distinguish the role ofnavigation satellites for navigation data demodulation, on the other hand, for the PRNcode ranging, in addition, the PRN code also affects the power spectrum of the navigationsignal and downs. Therefore, t the selection and optimization of the PRN code is animportant part of he GNSS. The PRN code optimization working is to select the betterperformance of the code from a large amount of code family. In this paper firstly we use msequence and its derivative Gold codes to determine The GPS C/A code as optimizedobject. Secondly we study optimization algorithm and grasp the main idea of optimizationalgorithm, consider the PRN code evaluation indicators to design a PRN code ptimizationalgorithm.Finally we use Matlab simulation software to achieve the PRN codeoptimization algorithm design, to select our own1025Gold code do the optimizationalgorithm and get the final result, compare with the GPS C/A code we verify the pseudo-codeoptimization algorithm to this article viablesex.