VIEWS: 30 PAGES: 7 CATEGORY: Research POSTED ON: 1/14/2013
The Geo-Stationary Navigation Satellite System will provides basically two types of services 1) Standard Positioning Service (SPS) and 2) Restricted Service (RS). Both of these services are provided at two frequencies of L and S-Band. The code sequences used in SPS and RS are Pseudo Ranging Noise (PRN) codes. In SPS downlink, it is planned to use Gold Codes for navigation data transmission. The RS navigation down link has signals with pilot component and data component. The pilot component uses primary code and secondary code to get final code known as tiered code. The primary code is truncated Gold code. The secondary code is PRN sequence code. The data component of RS service uses truncated PRN sequence code. This paper presents the performance analysis and simulation results of auto correlation function (ACF) and Cross correlation function (CCF) properties for Gold code, Kasami codes and it’s truncation effect. Apart from ACF and CCF, Doppler frequency shift on L & S-band carrier frequencies and Doppler frequency shift on L & S band Codes are carried out. The simulations of ACF & CCF on codes and Doppler effects were analyzed using Matlab and System View design tool and results are compared with Welch bound. The simulated test results are well within the theoretical limits.
"Analysis and Simulation of Pseudo Ranging Noise codes for Geo-Stationary Satellites and its Doppler Effect"