[其它]The Design and Implement of GPS Software Simulation Platform

Abstract—Due to different requirements of Global Vdvx"s[`m  
Positioning System (GPS) applications, performances of GPS jXEGSn  
receiver vary greatly. In order to evaluate a GPS receiver’s PI7IBI  
performances, a simulation platform build on Matlab has been R'EW7}&  
developed by this research. This platform includes four ) Ypz!  
elements: user interface, GPS signal simulator (intermediate GhnE>d;i  
frequency, IF), civilian (C/A) software receiver and noise j%M @#  
generator. Design and implementation of the platform are fkW(Dt,  
discussed in details in this paper. Firstly, a mathematical model <q7s`,rG  
of intermediate frequency (IF) GPS signal simulator is "2h5m4  
introduced. After that, methods of determining visual satellites Riql,g/  
and computing transmission time by using existing ephemeris oofFrAaT  
are also discussed. Secondly, key algorithms of the software n0.8)=;2  
receiver, including acquisition and tracking, are presented. WbzA Jx 5  
Finally, an experiment is demonstrated to test the validity of this `I>], J/  
platform. The close correspondence between pre-designed user e?)yb^7K  
trajectories and position results of the software receiver certifies \o9@>&2  
the validity of this platform. Compared with hardware v+tO$QZ`  
simulation, this platform possesses more effective and flexible. 11*"d#  
The performances of the receiver can be tested completely by *4#on>  
changing different scenes of signal simulator. All key techniques N^@ \tg=  
of this platform are modularized and coded with Matlab y<r44a_!  
language. .. vug-n 8  
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