Unambiguous Processing Techniques of Binary Offset Carrier Modulated Signals - Global Navigation Satellite Systems: Signal,Theory and Applications - page 74

Fig. 15. SCF for (a) BOC( n , n ) and (b) BOC(2 n , n ) Signals, with Different κ

2

κ =0.1
κ =0.3

1. 5

1

0. 5

0

-0.5

-1

-1.5

-2

-1 -0 .5 0 0.5 1

Fig. 16. The Discriminator Characteristic Curve for BOC( n , n ) Signals, with Different κ

Code Delay (Chips)

It can be noted that by using SCF, this technique completely removes the false lock points.
And it can also be seen that both shapes of SCF and discriminator characteristic curve are
functions of κ. Consequently, changing the value of κ can adjust the linear range of the
discriminator and the slope of the curve, thus changes the multipath and thermal noise
mitigation performances of the tracking loop (Yao, Cui, et al., 2010). With different
optimization objective, the optimum κ and the optimum chip waveform are not the same.

7. Conclusion

In this Chapter, the ambiguity problem of BOC modulated signals which have been chosen
as the chief candidate for several navigation signals in the next generation GNSS as well as