Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
Galileo OS SIS ICD.indd - GSA - Europa
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3.4.2. E1-B and E1-C Primary Codes<br />
The E1-B and E1-C primary codes are pseudo-random memory code sequences<br />
according to the hexadecimal representation provided in Annex C. Note that each set<br />
of codes for each signal component comprises 50 members.<br />
3.5. Secondary Codes<br />
3.5.1. Defi nition of Secondary Codes<br />
The secondary codes are fi xed sequences as defi ned in hexadecimal notation in<br />
Table 19 and Table 20, following again the convention used in paragraph 3.4.1.1. For<br />
secondary codes whose length is not dividable by four (case of CS25 1 only), the last<br />
(most right-hand) hexadecimal symbol is obtained by fi lling up the last group of code<br />
chips with zeros at the end in time (to the right), to reach a fi nal length of 4 binary<br />
symbols. Those two tables provide as well the code identifi ers together with the code<br />
lengths, the number of hexadecimal symbols and the number of fi lled zeros.<br />
For example, the CS251 secondary code in Table 19 corresponds to the binary sequence<br />
‘0 0 1 1 1 0 0 0 0 0 0 0 1 0 1 0 1 1 0 1 1 0 0 1 0’, the fi rst binary value corresponding to<br />
the fi rst secondary code chip in time.<br />
Code<br />
Identifi er<br />
Code No<br />
Start<br />
Value<br />
Initial<br />
Sequence<br />
Code No Start Value<br />
Table 18. Base Register 2 Start Values and First Code Chip for E5b-Q<br />
18 © European Union 2010<br />
Document subject to terms of use and disclaimers p. ii-iii<br />
OD <strong>SIS</strong> <strong>ICD</strong>, Issue 1, February 2010<br />
Initial<br />
Sequence<br />
16 05547 D2613E 41 25646 516499<br />
17 02456 EB443C 42 22157 6E4292<br />
18 30013 3FD0B1 43 04336 DC86A3<br />
19 00322 FCB7CF 44 16356 8C46BE<br />
20 10761 B83815 45 04075 DF0B03<br />
21 26767 48224A 46 02626 E9A5B2<br />
22 36004 0FEE25 47 11706 B0E553<br />
23 30713 38D33B 48 37011 07DBAC<br />
24 07662 C135B9 49 27041 4778E4<br />
25 21610 71DE13 50 31024 37AF4F<br />
Code<br />
Length<br />
No. of<br />
Hexadec.<br />
Symbols<br />
Number of<br />
Filled up<br />
Zeros<br />
Code Sequence<br />
CS4 1 4 1 0 E<br />
CS20 1 20 5 0 842E9<br />
CS25 1 25 7 3 380AD90<br />
CS100 1 100 25 0 83F6F69D8F6E15411FB8C9B1C<br />
CS100 2 100 25 0 66558BD3CE0C7792E83350525<br />
CS100 3 100 25 0 59A025A9C1AF0651B779A8381<br />
CS100 4 100 25 0 D3A32640782F7B18E4DF754B7<br />
CS100 5 100 25 0 B91FCAD7760C218FA59348A93
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