(Galileo) Open Service Signal In Space Interface Control Document

Table of Contents
1. Introduction .............................................................................................................................. 1
1.1. Document Scope ................................................................................................................................1
1.2. Document Overview ...........................................................................................................................1
1.3. Galileo System Overview ...................................................................................................................1
2. Galileo Signal Characteristics ................................................................................................ 2
2.1. Frequency Plan ...................................................................................................................................2
2.1.1. Frequency Bands ...........................................................................................................................2
2.1.2. Carrier Frequencies ......................................................................................................................2
2.1.3. Receiver Reference Bandwidths ...................................................................................................3
2.2. Signal Polarization ..............................................................................................................................3
2.3. Modulation ...........................................................................................................................................3
2.3.1. E5 Signal ........................................................................................................................................4
2.3.1.1. Modulation Scheme ................................................................................................................................ 4
2.3.1.2. Modulation Type ...................................................................................................................................... 5
2.3.1.3. Equivalent Modulation Type .................................................................................................................... 6
2.3.2. E6 Signal ........................................................................................................................................7
2.3.3. E1 Signal .......................................................................................................................................8
2.4. Logic Levels ......................................................................................................................................10
2.5. Transmitted Signal Phase Noise .....................................................................................................10
2.6. Transmitted Signals Code/Data Coherency ...................................................................................10
2.7. Received Power Levels on Ground .................................................................................................10
2.7.1. Minimum Levels ..........................................................................................................................10
2.7.2. Maximum Levels .........................................................................................................................10
2.8. Payload and Component Reception Losses .................................................................................. 11
3. Galileo Spreading Codes Characteristics............................................................................ 12
3.1. Code Lengths ....................................................................................................................................12
3.2. Tiered Codes Generation ................................................................................................................12
3.3. Primary Codes Generation ..............................................................................................................13
3.4. Primary Codes Definition .................................................................................................................13
3.4.1. E5 Primary Codes ........................................................................................................................13
3.4.1.1. Base Register 2 Start Value for E5a-I ................................................................................................... 14
3.4.1.2. Base Register 2 Start Value for E5a-Q ................................................................................................. 15
3.4.1.3. Base Register 2 Start Value for E5b-I ................................................................................................... 16
3.4.1.4. Base Register 2 Start Value for E5b-Q ................................................................................................. 17
3.4.2. E1-B and E1-C Primary Codes ....................................................................................................18
3.5. Secondary Codes .............................................................................................................................18
3.5.1. Defi nition of Secondary Codes.....................................................................................................18
3.5.2. Secondary Codes Assignment .....................................................................................................21
3.6. Code Assignments to Satellites ......................................................................................................22
3.6.1. Primary code assignment to satellites ..........................................................................................22
3.6.2. Secondary code assignment to satellites .....................................................................................24
4. Galileo Message Structure .................................................................................................... 26
4.1. General Message Format Specification ..........................................................................................26
4.1.1. General Navigation Message Content .........................................................................................26
4.1.2. General Navigation Message Structure .......................................................................................26
© European Union 2010
Document subject to terms of use and disclaimers p. ii-iii
OD SIS ICD, Issue 1, February 2010
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