Global Positioning System Reference
In-Depth Information
Table 4.3
Code Phase Assignments and Initial Code Sequences for C/A Code and P Code
SV PRN
Number
C/A Code
Tap Selection
C/A Code
Delay (Chips)
P Code
Delay (Chips)
First 10 C/A
Chips (Octal)
1
First 12 P
Chips (Octal)
1
2
⊕
6
5
1
1440
4444
2
3
⊕
7
6
2
1620
4000
3
4
⊕
8
7
3
1710
4222
4
5
⊕
9
8
4
1744
4333
5
17
5
1133
4377
1
⊕
9
6
18
6
1455
4355
2
⊕
6
7
139
7
1131
4344
1
⊕
8
8
2
⊕
9
140
8
1454
4340
9
3
⊕
10
141
9
1626
4342
10
2
⊕
3
251
10
1504
4343
11
3
⊕
4
252
11
1642
4343
12
5
⊕
6
254
12
1750
4343
13
255
13
1764
4343
6
⊕
7
14
256
14
1772
4343
7
⊕
8
15
8
⊕
9
257
15
1775
4343
16
9
⊕
10
258
16
1776
4343
17
1
⊕
4
469
17
1156
4343
18
2
⊕
5
470
18
1467
4343
19
3
⊕
6
471
19
1633
4343
20
4
⊕
7
472
20
1715
4343
21
473
21
1746
4343
5
⊕
8
22
474
22
1763
4343
6
⊕
9
23
1
⊕
3
509
23
1063
4343
24
4
⊕
6
512
24
1706
4343
25
5
⊕
7
513
25
1743
4343
26
6
⊕
8
514
26
1761
4343
27
7
⊕
9
515
27
1770
4343
28
8
⊕
10
516
28
1774
4343
29
859
29
1127
4343
1
⊕
6
30
860
30
1453
4343
2
⊕
7
31
3
⊕
8
861
31
1625
4343
32
4
⊕
9
862
32
1712
4343
33
2
5
⊕
10
863
33
1745
4343
34
2
4
⊕
10
3
950
3
34
1713
3
4343
35
2
1
⊕
7
947
35
1134
4343
36
2
2
⊕
8
948
36
1456
4343
37
2
10
3
950
3
37
1713
3
4343
4
⊕
1. In the octal notation for the first 10 chips of the C/A code, as shown in this column, the first digit (1) represents a
1 for the first chip and the last three digits are the conventional octal representation of the remaining 9 chips. For
example, the first 10 chips of the SV PRN number 1 C/A code are 1100100000.
2. PRN codes 33 through 37 are reserved for other uses (e.g., pseudolites).
3. C/A codes 34 and 37 are identical.
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