ETSI TS 103 246-2 V1.3.1 (2020-10)

Satellite Earth Stations and Systems (SES); GNSS based location systems; Part 2: Reference Architecture

RTS/SES-00452

General Information

• Status: Not Published
• Technical Committee: SES SCN - Satellite Communications and Navigation
• Current Stage: 12 - Completion
• Due Date: 10-Sep-2020
• Completion Date: 01-Oct-2020
• Mandate: M/496

Standards Content (Sample)

ETSI TS 103 246-2 V1.3.1 (2020-10)






TECHNICAL SPECIFICATION
Satellite Earth Stations and Systems (SES);
GNSS based location systems;
Part 2: Reference Architecture

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2 ETSI TS 103 246-2 V1.3.1 (2020-10)



Reference
RTS/SES-00452
Keywords
architecture, GNSS, location, MSS, navigation,
receiver, satellite, system, terminal

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3 ETSI TS 103 246-2 V1.3.1 (2020-10)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
Introduction . 5
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 11
3.3 Abbreviations . 11
4 Requirements for GNSS-Based Location Systems . 13
5 GBLS Architecture (Level 1) . 14
5.1 Level 1 architecture functional blocks and logical interfaces . 14
5.2 External Functional Blocks . 16
5.2.1 GNSS and Other External Systems . 16
5.2.1.1 GNSS . 16
5.2.1.2 Other External Systems . 16
5.2.2 Application(s) . 16
5.3 GBLS Functions . 17
5.4 GBLS External Interfaces. 17
6 GBLS Architecture (Level 2) . 17
6.1 Level 2 architecture mandatory and optional components . 17
6.1.1 General . 17
6.1.2 GBLS architecture with Target Positioning Module only . 19
6.1.3 GBLS architecture with Target Positioning Module and Central Facility . 20
6.2 Positioning Module (PM) . 21
6.2.1 Sensor Management . 21
6.2.2 On-Board Position Calculation Module (OBPCM) . 21
6.2.3 Application Interface Module . 21
6.3 Central Facility (CF) . 21
6.3.1 Centralized Position Calculation Module (CPCM) . 21
6.3.2 Central Management Module (CMM) . 21
6.3.3 Application Interface Module . 22
6.4 Core Interface . 22
7 GBLS Architecture (Level 3) . 23
7.1 Level 3 detailed architecture . 23
7.1.1 Generic GBLS . 23
7.2 Functional Block Definitions . 23
7.2.1 List of functional blocks . 23
7.2.2 GNSS Sensor . 24
7.2.3 Telecommunication Module . 24
7.2.4 Inertial Sensor . 25
7.2.5 Magnetometer . 25
7.2.6 Odometer . 25
7.2.7 Beam Forming Antenna . 25
7.2.8 EMI Mitigation . 25
7.2.9 EMI Location . 25
7.2.10 Location Hybridization Algorithm . 26
7.2.11 Integrity Building Algorithm . 26
7.2.12 PPP Module . 26
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4 ETSI TS 103 246-2 V1.3.1 (2020-10)
7.2.13 D-GNSS/RTK processing module . 27
7.2.14 Location Authentication . 27
7.2.15 Security Provisioning . 28
7.2.16 Security Verification . 28
7.2.17 Privacy Provisioning . 28
7.2.18 Privacy Test . 28
7.2.19 Application Interface Module . 28
7.2.20 Reference Receivers . 28
7.2.21 Assistance server . 28
7.2.22 Map database . 29
7.2.23 Real Time Clock (RTC) . 29
7.2.24 Key Storage and Management (KSM) . 29
7.3 Interfaces . 30
Annex A: Void . 32
Annex B (informative): Specific case of GBLS using differential GNSS . 33
B.1 Main use cases . 33
B.2 Impact on GBLS level 2 architecture . 35
B.3 Impact on GBLS Level 3 architecture . 37
Annex C (normative): Assisted GNSS architectures . 44
C.1 Impact on GBLS level 2 . 44
Annex D (informative): OSNMA within GBLS . 46
D.1 Implementation options . 46
Annex E (informative): Bibliography . 47
History . 48

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5 ETSI TS 103 246-2 V1.3.1 (2020-10)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Satellite Earth Stations and
Systems (SES).
The present document is part 2 of a multi-part deliverable covering the GNSS based location systems, as identified
below:
Part 1: "Functional requirements";
Part 2: "Reference Architecture";
Part 3: "Performance requirements";
Part 4: "Requirements for location data exchange protocols";
Part 5: "Performance Test Specification".
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
The increasing expansion of location-based applications aims to satisfy more and more complex and diversified user
requirements: this is highlighted for example by the widespread adoption of multi-functional smart-phones or by the
ever wider adoption of tracking devices (e.g. in transport), etc. This requirement for new and innovative location-based
applications is generating a requirement for increasingly complex location systems.
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6 ETSI TS 103 246-2 V1.3.1 (2020-10)
The wide spectrum of location-based applications identified in ETSI TR 103 183 [i.1] calls for a new and broader
concept for location systems, taking into account solutions in which GNSS technologies are complemented with other
technologies to improve robustness and performance. The notion of GNSS-based location systems is introduced and
defined in the present document.
Additional clauses and information related to the implementation in GNSS-based location systems of the various
differential GNSS technologies, namely D-GNSS, RTK and PPP are also included in order to facilitate the use of this
set of standards by manufacturers and service providers.
Hence a set of standards for GNSS-based Location systems is defined of which the present document is part 2.

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7 ETSI TS 103 246-2 V1.3.1 (2020-10)
1 Scope
The present document defines the architecture applicable to location systems. This is a "functional" architecture,
meaning that the system is defined in terms of discrete functional elements connected to other internal or external
functional elements via associated "logical" interfaces. These functional elements and interfaces are derived from
service requirements.
The functional architecture is not necessarily related to the "physical architecture" (i.e. the relationship between
equipment which may implement all or some of these functions, and the physical interfaces between them).
The present document can be considered as the Stage 2 functional specification according to the ITU/3GPP approach
[i.4].
ETSI TS 103 246 part 1 [10], part 3 [i.6], part 4 [i.2] and part 5 [i.3] address integrated GNSS Based Location Systems
(GBLS) that combine Global Navigation Satellite Systems (GNSS), with other navigation technologies, as well as with
telecommunication networks in order to deliver location-based services to users. As a consequence the present
document is not applicable to GNSS only receivers.
ETSI TS 103 246 part 1 [10], part 3 [i.6], part 4 [i.2] and part 5 [i.3] propose a list of functional and performance
requirements and related test procedures. For each performance requirement, different classes are defined allowing the
benchmark of different GNSS Based Location Systems (GBLS) addressing the same applications.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] IS-GPS-200K: "Navstar GPS Space Segment/Navigation User Segment Interfaces".
[2] IS-GPS-705F: "Navstar GPS Space Segment/User Segment L5 Interfaces".
[3] IS-GPS-800F: "Navstar GPS Space Segment/User Segment L1C Interfaces".
[4] "European GNSS (Galileo) Open Service Signal In Space Interface Control Document", Issue 1.3.
[5] BDS-SIS-ICD-B1I-3.0: "BeiDou Navigation Satellite System Signal In Space Interface Control
Document; Open Service Signal B1I (Version 3.0)".
[6] "Global Navigation Satellite System GLONASS Interface Control Document", edition 5.1, 2008.
[7] IS-QZSS-PNT-003: "Quasi-Zenith Satellite System Interface Specification Satellite Positioning,
Navigation and Timing Service", revision 003.
[8] ISRO-IRNSS-SIS-ICD-SPS-1.1: "Signal In Space ICD For Standard Positioning Service
Version 1.1".
[9] RTCM 10403.2: "Differential GNSS (Global Navigation Satellite Systems) Service".
[10] ETSI TS 103 246-1: "Satellite Earth Stations and Systems (SES); GNSS based location systems;
Part 1: Functional requirements".
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8 ETSI TS 103 246-2 V1.3.1 (2020-10)
[11] RTCM 10402.3: "Recommended Standards for Differential GNSS (Global Navigation Satellite
Systems) Service".
[12] RTCM 10401.2: "Standard for Differential Navstar GPS Reference Stations and Integrity Monitors
(RSIM)".
[13] US Department of Transportation, Federal Aviation Administration: "Global Positioning System
Wide Area Augmentation System (WAAS) Performance Standard", 1st Edition, 31 October 2008.
NOTE: Available at http://www.gps.gov/technical/ps/2008-WAAS-performance-standard.pdf.
[14] RTCA DO-229: "Minimum Operational Performance Standards for Global Positioning
System/Satellite-Based Augmentation System Airborne Equipment".
[15] BDS-SIS-ICD-B1C-1.0: "BeiDou Navigation Satellite System Signal In Space Interface Control
Document; Open Service Signal B1C (Version 1.0)".
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TR 103 183: "Satellite Earth Stations and Systems (SES); Global Navigation Satellite
Systems (GNSS) based applications and standardisation needs".
[i.2] ETSI TS 103 246-4: "Satellite Earth Stations and Systems (SES); GNSS based location systems
Part 4: Requirements for location data exchange protocols".
[i.3] ETSI TS 103 246-5: "Satellite Earth Stations and Systems (SES); GNSS based location systems
Part 5: Performance Test specification".
[i.4] Recommendation ITU-T I.130: "Method for the characterization of telecommunication services
supported by an ISDN and network capabilities of an ISDN".
[i.5] M. A. Abdel-Salam: "Precise Point Positioning Using Un-Differenced Code and Carrier Phase
Observations", PH.D. Thesis, Department of Geomatics Engineering, Calgary, Alberta (CAN),
September 2005.
[i.6] ETSI TS 103 246-3: "Satellite Earth Stations and Systems (SES); GNSS based location systems
Part 3: Performance requirements".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
accuracy (or error): difference between a measured or estimated value and its real value
application module: entity in charge of retrieving from a location system the location-related data associated with one
or more location targets and processing it in order to deliver to the application user the location based service it has been
designed for
NOTE: The application module can be located inside or outside the terminal.
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9 ETSI TS 103 246-2 V1.3.1 (2020-10)
architecture: abstract representation of a communication system
NOTE: Three complementary types of architecture are defined:
 Functional Architecture: the discrete functional elements of the system and the associated logical
interfaces.
 Physical (Network) Architecture: the discrete physical (network) elements of the system and the
associated physical interfaces.
 Protocol Architecture: the protocol stacks involved in the operation of the system and the
associated peer relationships.
authentication: process/protocol to provide authenticity
authenticity: assurance that the location-related data associated with a location target has been derived from real and
not falsified signals
availability: percentage of time that a location system is able to provide the required location-related data
carrier phase measurement: measure of the range between the satellite and receiver expressed in units of cycles of the
carrier frequency
continuity: likelihood that the location system functionality will be available during the complete duration of the
intended operation if the system is operational at the beginning of the operation
D-GNSS: technique aiming at enhancing position accuracy and integrity of a GNSS receiver by using differential
pseudorange corrections and "do not use flag" for faulty satellites delivered by a GNSS reference station located at a
known location
NOTE: In the present document, the term D-GNSS refer to conventional differential GNSS.
electromagnetic interference: any source of RF transmission that is within the frequency band used by a
communication link, which degrades the performance of this link
fraud: any kind of activity of a location-based application stakeholder aiming at jeopardizing the application objective
GNSS-based location system (GBLS): location system using GNSS as the primary source of positioning
GNSS only receiver: location receiver using GNSS as the unique source of positioning
integrity: measure of the trust in the accuracy of the location-related data provided by the location system and the
ability to provide timely and valid warnings to users when the location system does not fulfil the condition for intended
operation
NOTE: Integrity is expressed through the computation of a protection level. The Integrity function is built to
deliver a warning (or alert) of any to users within a given period of time (time-to-alert).
Related to the Integrity concept, a Loss of Integrity event occurs when an unsafe condition occurs (i.e. a
positioning error higher that the protection level) without annunciation for a time longer than the
time-to-alert limit.
Integrity Monitor (IM): only applicable to conventional D-GNSS. A component of the D-GNSS Reference Station
which is responsible for validating the integrity of the correction computation and broadcast signals
NOTE: When this IM component detects anomalies, it reports these conditions to the Reference Station
component.
jamming: deliberate transmission of interference to disrupt reception of desired signals, which in this case are GNSS or
telecommunication signals
NOTE: Spoofing is considered to be a deceptive form of jamming.
latency: measure of the time elapsed between the event triggering the determination of the location-related data for a
location target and the availability of the location-related data at the user interface
location-based application: application which is able to deliver a service to one or several users, built on the
processing of the location information (location-related data) related to one or several targets
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10 ETSI TS 103 246-2 V1.3.1 (2020-10)
location-related data: set of data associated with a given location target, containing one or more of the following
time-tagged information elements: target position, target motion indicators (velocity and acceleration), and quality of
service indicators (estimates of the position accuracy, reliability or authenticity)
location system: system responsible for providing to a location based application the location-related data of one or
several location targets
location system central facility: centralized logical entity, inside a location system, that gathers the location
information and manages the communication of the location-related data to the application module, which is the
location system external client
location target: physical entity (mobile or stationary) whose position is the focus of the location related data to be built
by the location system
privacy: function of a location system designed to ensure that the location target user's private information (identity,
bank accounts, etc.) and its location-related data cannot be accessed by an unauthorized third party
positioning module: logical entity inside a location target responsible for providing, as a minimum, the relevant
measurements for locating the target
NOTE: In some cases, the positioning module will also determine the location of the target and provide the
location related data to the application module. In other cases, it will provide raw measurements to the
location system central facility (enabling it to determine t
...