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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.