GPS C/A Code Signal Structure - Fundamentals of Global Positioning System Receivers: A Software Approach - page 75

FIGURE 5.4 G1, G2 maximum-length sequence generators.

TABLE 5.2 Modulo-2 Addition

Input 1 Input 2 Output

0 0 0

0 1 1

1 0 1

1 1 0

output. However, the G2 generator does not use the MLS output as the output.
The output is generated from two bits which are referred to as the code phase
selections through another modulo-2 adder as shown in Figures 5.4b and c. This
G2 output is a delayed version of the MLS output. The delay time is determined
by the positions of the two output points selected.