Evaluación del rendimiento de la modulación Binary Offset Carrier Sobre la señal civil GPS.L1 para diferentes modelos de canal mediante un entorno de simulación.

Abstract

In this research work the evaluation of two modulation techniques for satellite signal were carried out, The Binary Phase Shift Keying, also known as BPSK and Binary Offset Carrier, knows as BOC, which object is to determine which one has a better performance at analyzing the civil Satellite signal of GPS L1.The analytical methodology was used in this research work Which is based on the analysis of specific parameters such as: Fundamental frequency where the civil signal of GPS L1 is transmitted, the generation frequency of the pseudorandom code C/A, the number of frames and bits that make a navigation message (NAV) and are used to generate an prepare the GPS L1 signal, the type of encoder channel for detecting and correction of errors, the speed of the receiver and different signal noise ratio values which allow determining the performance of the Rayleigh and Rician type transmission channel. To run the simulations, the Matlab software was used because it is an appropriate simulator for processing data and parameter analysis. The results obtained after the simulation established that to retrieve the information send through the Rayleigh or Rician type transmission channel the Binary Offset Carrier is the most suitable modulation due to the spectral power density is divided in two main lobes of 2MHz each, where there is a higher concentration of power and the test results of the Bit Error Rate vs. Signal Noise ratio for different speeds of the GPS, reaching a higher imperviousness to noise, higher recovery capacity of bits, ensuring this way a more efficiency in the data positioning.