The Galileo BOC(1,1) receiver, with a dot product discriminator as implemented in this paper, should offer a code tracking improvement of 3 / 1 over BPSK(1) (where 3 is the ratio of the slope of the BOC(1,1) main correlation peak to the BPSK(1) peak).

The signal generator and receiver were set to track BPSK(1) and the C/No was varied over time. The receiver was set up to output code measurements, which were logged by the host computer. The test was run once for the data channel only. Figure 12 shows the measured results from the receiver for BPSK Data along with the expected value calculated using equation (2). As can be seen from Figure 12, the measured results agree with the expected results very well.

A similar test was completed for BOC(1,1). The expected performance was calculated using equation (1). The measured and expected results are shown in Figure 13. Again, the measured results from the receiver agree very well with theory. The results from Figure 12 and Figure 13 are plotted together in Figure 14 to emphasize the performance improvement of BOC(1,1) over BPSK(1). The improvement in pseudorange code tracking performance is approximately a factor of 3 / 1 , as predicted earlier. The results of experiments show that implemented signal generator and software receiver are correctly working.

In this paper, a design and implementation of GPS/Galileo software receiver is given. The exisitng GPS receiver which can perform every function of receiver such as acquisition, code and carrier tracking, navigation bit extraction, navigation data decoding, pseudorange calculations, and position calculations is extended to GPS/Galileo receiver. The combined receiver can handle GPS C/A, L2C and Galileo BOC(1,1) signal. A dump jump method to acquire and track the Galileo BOC(1,1) signal is implemented to avoid false tracking. The performance evaluation using GPS/Galileo IF signal generator and software receiver with BOC(1,1) signal tracking feature show that the implemented software receiver can be applied to GNSS receiver design and implementation. Currently, the navigation facility using Galileo signal and Galileo L5 signal processing are further researched by our group.