Global Positioning System Reference
In-Depth Information
TABLE 5.3 Code Phase Assignments
Satellite ID
Number
GPS PRN
Signal Number
Code Phase
Selection
Code Delay
Chips
First 10 Chips
C/A Octal
1
1
2
⊕
6
5
1440
2
2
3
⊕
7
6
1620
3
3
4
⊕
8
7
1710
4
4
5
⊕
9
8
1744
⊕
5
5
1
9
17
1133
6
6
2
⊕
10
18
1455
7
7
1
⊕
8
139
1131
8
8
2
⊕
9
140
1454
9
9
3
⊕
10
141
1626
10
10
2
⊕
3
251
1504
11
11
3
⊕
4
252
1642
12
12
5
⊕
6
254
1750
13
13
6
⊕
7
255
1764
14
14
7
⊕
8
256
1772
15
15
8
⊕
9
257
1775
16
16
9
⊕
10
258
1776
17
17
1
⊕
4
469
1156
⊕
18
18
2
5
470
1467
19
19
3
⊕
6
471
1633
20
20
4
⊕
7
472
1715
21
21
5
⊕
8
473
1746
22
22
6
⊕
9
474
1763
23
23
1
⊕
3
509
1063
24
24
4
⊕
6
512
1706
25
25
5
⊕
7
513
1743
26
26
6
⊕
8
514
1761
27
27
7
⊕
9
515
1770
28
28
8
⊕
10
516
1774
29
29
1
⊕
6
859
1127
30
30
2
⊕
7
860
1453
31
31
3
⊕
8
861
1625
32
32
4
⊕
9
862
1712
∗∗
33
5
⊕
10
863
1745
∗∗
34
∗
4
⊕
10
950
1713
∗∗
35
1
⊕
7
947
1134
∗∗
36
2
⊕
8
948
1456
∗∗
37
∗
4
⊕
10
950
1713
∗
34 and 37 have the same C/A code.
∗∗
GPS satellites do not transmit these codes; they are reserved for other uses.
output sequence is delayed 471 chips from the MLS output. The last column is
1633, which means 1 110 011 011 in binary form. If the first 10 bits generated
for satellite 19 do not match this number, the code is incorrect.
A computer program (p5 1) is listed at the end of this chapter to generate
both the MLS and G2 output sequences. The program takes columns 3 and 4
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