IS-GPS-705D (797936), страница 2
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16Figure 3-7.Convolution Encoder ........................................................................................... 17Figure 3-8.Convolution transmit/Decoding Timing Relationships ....................................... 18Figure 3-9.Time Line Relationship of a Six-Second Message .............................................. 20Figure 6-1.Carrier Phase Noise Spectral Density ..................................................................
27Figure 10.3-1. Letters of Exception ............................................................................................. 36Figure 10.3-2. Letters of Exception (continued). ........................................................................
37Figure 10.3-3. Letters of Exception (continued) ......................................................................... 38Figure 10.3-4. Letters of Exception (continued) ......................................................................... 39Figure 20-1.Message type 10 - Ephemeris 1 ........................................................................... 42Figure 20-2.Message type 11 - Ephemeris 2 ........................................................................... 43Figure 20-3.Message type 30 - Clock, IONO & Group Delay ................................................ 44Figure 20-4.Message type 31 - Clock & Reduced Almanac ...................................................
45Figure 20-5.Message type 32 - Clock & EOP ......................................................................... 46Figure 20-6.Message type 33 - Clock & UTC ......................................................................... 47Figure 20-7.Message type 34 - Clock & Differential Correction ............................................ 48Figure 20-8.Message type 35 - Clock & GGTO ...................................................................... 49Figure 20-9.Message type 36 - Clock & Text.......................................................................... 50Figure 20-10.
Message Type 37 - Clock & Midi Almanac ........................................................ 51viIS-GPS-705D24 Sep 2013Figure 20-11. Message type 12 - Reduced Almanac .................................................................. 52Figure 20-12. Message type 13 - Clock Differential Correction ................................................ 53Figure 20-13.
Message type 14 - Ephemeris Differential Correction ......................................... 54Figure 20-14. Message type 15 – Text........................................................................................ 55Figure 20-15: Sample Application of Correction Parameters..................................................... 75Figure 20-16. Reduced Almanac Packet Content ....................................................................... 79Figure 20-17.
Differential Correction Data Packet ..................................................................... 85viiIS-GPS-705D24 Sep 2013LIST OF TABLESTable 3-Ia.Code Phase Assignments (sheet 1 of 2) ................................................................. 5Table 3-Ia.Code Phase Assignments (sheet 2 of 2) .................................................................
6Table 3-Ib.Additional Code Phase Assignments (sheet 1 of 1) ............................................... 7Table 3-II.Composite L5 Transmitted Signal Phase** ........................................................... 9Table 3-III.Received Minimum RF Signal Strength..............................................................
10Table 3-IV.Space Service Volume (SSV) Received Minimum RF Signal Strength for GPS IIIand Subsequent Satellites over the Bandwidth Specified in 3.3.1.1 – GEO BasedAntennas .............................................................................................................. 10Table 6-I.Typical Ellipticity vs Off-Boresight Angle ..........................................................
28Table 6-II.Additional Code Phase Assignments (sheet 1 of 5) ............................................. 29Table 6-II.Additional Code Phase Assignments (sheet 2 of 5) ............................................. 30Table 6-II.Additional Code Phase Assignments (sheet 3 of 5) ............................................. 31Table 6-II.Additional Code Phase Assignments (sheet 4 of 5) ............................................. 32Table 6-II.Additional Code Phase Assignments (sheet 5 of 5) ............................................. 33Table 20-I.Message Types 10 and 11 Parameters (1 of 2)...................................................
61Table 20-I.Message Types 10 and 11 Parameters (2 of 2) .................................................. 62Table 20-II.Elements of Coordinate System (part 1 of 2) .................................................... 63Table 20-II.Elements of Coordinate System (part 2 of 2) .................................................... 64Table 20-III.Clock Correction and Accuracy Parameters ........................................................
66Table 20-IV.Group Delay Differential Parameters **** ........................................................ 71Table 20-V.Midi Almanac Parameters .................................................................................. 77Table 20-VI.Reduced Almanac Parameters ............................................................................ 79Table 20-VII.Earth Orientation Parameters ............................................................................. 81Table 20-VIII.
Application of EOP Parameters .......................................................................... 82Table 20-IX.UTC Parameters ................................................................................................. 83viiiIS-GPS-705D24 Sep 2013Table 20-X.Differential Correction Parameters ..................................................................... 86Table 20-XI.GPS/GNSS Time Offset Parameters ..................................................................
91Table 20-XII.Message Broadcast Intervals .............................................................................. 92ixIS-GPS-705D24 Sep 20131 INTRODUCTION1.1 Scope.This Interface Specification (IS) defines the requirements related to the interface between theSpace Segment (SS) of the Global Positioning System (GPS) and the navigation User Segment(US) of the GPS for radio frequency (RF) link 5 (L5).1.2 IS Approval and Changes.The Interface Control Contractor (ICC) designated by the government is responsible for the basicpreparation, obtaining approval coordination, distribution, retention, and Interface ControlWorking Group (ICWG) coordination of the IS in accordance with GP-03-001.
The NavstarGPS Directorate (SMC/GP) is the necessary authority to make this IS effective. SMC/GPadministers approvals under the auspices of the Configuration Control Board (CCB), which isgoverned by the appropriate GPS Directorate Operating Instruction (OI). Military organizationsand contractors are represented at the CCB by their respective segment member. All civilorganizations and public interest are represented by the Department of Transportationrepresentative of the SMC/GP.A proposal to change the approved version of this IS can be submitted by any ICWGparticipating organization to the GPS Directorate and/or the ICC.
The ICC is responsible for thepreparation of the change paper and change coordination, in accordance with GP-03-001. TheICC prepares the change paper as a Proposed Interface Revision Notice (PIRN) and isresponsible for coordination of PIRNs with the ICWG. The ICWG coordinated PIRN must besubmitted to the GPS Directorate CCB for review and approval.The ICWG review period for all Proposed Interface Revision Notices (PIRNs) is 45 days afterreceipt by individual addressees. A written request to extend the review period may besubmitted to the ICC for consideration.2 APPLICABLE DOCUMENTS2.1 Government Documents.The following documents of the issue specified contribute to the definition of the interfacesbetween the GPS Space Segment and the GPS navigation User Segment (US), and form a part ofthis IS to the extent specified herein.SpecificationsFederalNone1IS-GPS-705D24 Sep 2013MilitaryNoneOther Government ActivityNoneStandardsFederalNoneMilitaryNoneOther PublicationsIS-GPS-200Navstar GPS Space Segment / Navigationcurrent issueUser InterfacesGP-03-001GPS Interface Control Working Groupcurrent issue(ICWG) Charter2.2 Non-Government Documents.The following documents of the issue specified contribute to the definition of the interfacesbetween the GPS SS and the GPS Navigation US and form a part of this IS to the extentspecified herein.SpecificationsNoneOther PublicationsInternational Earth Rotation and Reference Systems Service (IERS) Technical Note 363 REQUIREMENTS3.1 Interface Definition.The signal interface between the GPS SS and the GPS Navigation US includes three radiofrequency (RF) links: L1, L2 and L5.
Figure 3-1 illustrates the interface between the SS and theusers. The L5 link is only available on Block IIF and the subsequent Blocks of SVs. Utilizing2IS-GPS-705D24 Sep 2013these links, the space vehicles (SVs) of the SS shall provide continuous earth coverage signalsthat provide to the users the ranging codes and the system data needed to accomplish the GPSNavigation (NAV) mission.
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