GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 2 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
Distribution List
Internal Copies External Copies
Archive 1 Indra Espacio 1
Document Change Log
Iss./Rev. Date Section / Page Change Description
Issue 1 09/09/2005 - Document creation.
Issue 1.1 08/11/2005 - Update based on comments from CNES.
Issue 1.2 12/12/2005 p. 14, 17 Update of Satellite Ephemeris Message and corresponding MFs. Inclusion of new “UTC CONVERSION” MF.
Issue 2.0 07/04/2006 All
Add information for Tracking DASS POC satellites
Add miscellaneous information regarding messages description and format
Review of the document
This issue is part of the CDR datapackage.
Contents Table of Contents actualised according to rearrangement in section 2.2
Section 2.2.1 Rewrite as per CDR DRS comment. Issue 2.1 12/05/2006
This issue is part of the CDR Close-out datapackage.
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 3 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
Contents
1. INTRODUCTION .............................................................................................................4 1.1 OBJECTIVE ....................................................................................................................4 1.2 APPLICABLE DOCUMENTS ..............................................................................................4 1.3 REFERENCE DOCUMENTS ..............................................................................................4 1.4 ACRONYMS AND TERMS.................................................................................................5 1.5 TBC/TBD LIST...............................................................................................................6 2. EXTERNAL INTERFACE DEFINITION...........................................................................8 2.1 OVERVIEW.....................................................................................................................8
2.1.1 Terminology .........................................................................................................8 2.1.2 Interface overview................................................................................................8
2.2 MEOLUT EXTERNAL INTERFACES................................................................................10 2.2.1 SAR downlink SIS..............................................................................................10
2.2.1.1 Signal in DASS POC satellites.......................................................................10 2.2.2 GPS SIS.............................................................................................................10 2.2.3 MCC...................................................................................................................10
2.2.3.1 Overview of the interface ...............................................................................10 2.2.3.2 Physical characteristics..................................................................................10 2.2.3.3 Protocols ........................................................................................................10
2.2.3.3.1 Low-level protocols ................................................................................................10 2.2.3.3.2 High-level protocols ...............................................................................................10
2.2.3.4 Messages.......................................................................................................10 2.2.3.4.1 SAR Distress Data .................................................................................................10 2.2.3.4.2 External TOA/FOA Pairs Request .........................................................................10 2.2.3.4.3 External TOA/FOA Pairs Message ........................................................................10 2.2.3.4.4 Satellite Ephemeris Message ................................................................................10 2.2.3.4.5 Satellite Status .......................................................................................................10 2.2.3.4.6 Service Bulletins ....................................................................................................10
2.2.3.5 Message Fields Description ...........................................................................10
List of Figures FIGURE 1: MEOLUT HIGH-LEVEL PHYSICAL ARCHITECTURE........................................................9 FIGURE 2: SPACE SEGMENT DIAGRAM OF DASS PROOF OF CONCEPT FUNCTIONS ...................10 FIGURE 3: DASS SIGNAL FREQUENCY TRANSLATION ................................................................10
List of Tables TABLE 1: MESSAGE CONTENT FOR SAR DISTRESS DATA MESSAGE FOR LOCATED ALERTS.......10 TABLE 2: MESSAGE CONTENT FOR SAR DISTRESS DATA MESSAGE FOR UNLOCATED ALERTS ..10 TABLE 3: MESSAGE CONTENT FOR EXTERNAL TOA/FOA PAIRS REQUEST MESSAGE................10 TABLE 4: MESSAGE CONTENT FOR EXTERNAL TOA/FOA PAIRS MESSAGE ...............................10 TABLE 5: MESSAGE CONTENT FOR SATELLITE EPHEMERIS MESSAGE .......................................10 TABLE 6: MESSAGE CONTENT FOR SATELLITE STATUS MESSAGE .............................................10 TABLE 7: MESSAGE CONTENT FOR SERVICE BULLETIN MESSAGE .............................................10 TABLE 8: NEW OR MODIFIED MESSAGE FIELDS.........................................................................10
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 4 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
1. INTRODUCTION
1.1 OBJECTIVE
The purpose of this document is to provide a detailed description of the interface between the MEOLUT Prototype and the External entities with which it communicates.
The interface between a LUT and an MCC is not formally defined by C/S (see 3.4.1, 3.5.1 of RD-03). However, given that the MCC has to communicate with other MCCs in the format described in RD-02, many LUTs follow the interface defined in this document to facilitate implementation. RD-02 covers the communication required for the LEOSAR and GEOSAR systems. The full description of the different messages is not included in this document (refer to RD-02), only updates or additions are proposed to cover the functionality of the MEOSAR system. The document follows the structure described in RD-05, although for convenience and given that most of the interface is the same, the description for this interface follows the standard interface description used in RD-02.
1.2 APPLICABLE DOCUMENTS
AD-01 Cospas-Sarsat Galileo ICD, (COSSARGALICD) Ref.: GAL-ID-GLI-SYST-A-0375, Is. 6, Rev. 0, 19/01/2005
1.3 REFERENCE DOCUMENTS
RD-01 External Interface Management Module Requirements Document (EIMM-REQ) Ref.: GIS-TN-007-IE, Issue 1.2, 01/06/2005
RD-02 Cospas-Sarsat Mission Control Centres Standard Interface Description Ref.: C/S A.002, Is. 4, Rev. 8, October 2004
RD-03 Cospas-Sarsat Mission Control Centre (MCC) Performance Specification And Design Guidelines Ref.: C/S A.005, Is. 3, Rev. 2, October 2002
RD-04 GISAR Glossary (GISGLO) Ref.: GIS-TN-005-IE
RD-05 Guidelines for GISAR ICDs Ref: GIS-MSC-001-IE, Issue 1, 27/05/2005
RD-06 Global Positioning System Standard Positioning Service Signal Specification Ref.: 2nd Edition, June 2, 1995
RD-07 Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System Airborne Equipment Ref.: RTCA/DO-229
RD-08 Cospas-Sarsat Data Distribution Plan Ref: C/S A.001, Is. 4, Rev. 7, October 2004
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 5 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
RD-09 Cospas-Sarsat 406 MHz MEOSAR Implementation Plan Ref.: C/S R.012, Is. 1, October 2004
RD-10 Forward Link Service Operations & Service Possibilities Report Ref.: GIS-TN-002-CNES, Issue 1.0, 20/06/2005
RD-11 Return Link Service Operations & Service Possibilities Report Ref.: GIS-TN-001-CNES, Issue 1.2, 20/06/2005
1.4 ACRONYMS AND TERMS
Acronym Description ACU Antenna Control Unit
AD Applicable Document
AFTN Aeronautical Fixed Telecommunication Netwok
AGC Automatic Gain Control
AMHS Aeronautical Message Handling System
CP Core Processor
CPS Core Processor Set
DASS Distress Alerting Satellite System
DDC Digital Down-Converter (part of the FES)
EIRP Equivalent Isotropic Radiated Power
FES Front-End Set
FESA Front-End-Set Adaptor (Sofware module within the CPS)
FOA Frequency of Arrival
FTP File Transfer Protocol
GMS Ground Mission Segment
GNSS Global Navigation Satellite System
IE Indra Espacio
LHCP Left-Hand Circular Polarisation
LODU Local Oscillator Distribution Unit (part of the FES)
LUT Local User Terminal
[M] Mandatory [section]
M&C Monitoring and Control
MCC Mission Control Centre
MEOLUT Medium-Altitude Earth Orbit Local User Terminal
MEOSAR Medium-Altitude Earth Orbit Search and Rescue
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 6 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MF Message Field
N/A Not Applicable
POC Proof Of Concept
PPS Pulse Per Second
RD Reference Document
RFE Radio Frequency Equipment (part of the FES)
RHCP Right-Hand Circular Polarisation
RLM Return Link Message
RLSP Return Link Service Provider
RXS Receiver Set
SAR Search And Rescue
SIS Signal In Space
SIT Subject Indicator Type
SNMP Simple Network Management Protocol
SW SoftWare
TAS Thales Airborne Systems
TBC To Be Confirmed
TBD To Be Determined
TFR Time and Frequency Reference
TOA Time of Arrival
UTC Universal Time Coordinated
UTP Unshielded Twisted Pair
See also RD-04.
1.5 TBC/TBD LIST
Section TBC 2.2.3.2 Physical characteristics of the connection between the MEOLUT Prototype
and the MCC
Section TBD 2.2.3.2 mode and features of the physical connection between the MEOLUT
Prototype and the MCC
2.2.3.2 Details on the exact configuration, security and detailed characteristics of the physical connection between the MEOLUT Prototype and the MCC
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 7 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
2.2.3.3.1 Details on the exact configuration, security and detailed characteristics of the low level communication protocol between the MEOLUT Prototype and the MCC
2.2.3.3.2 Details on the exact configuration, security and detailed characteristics of the high level communication protocol between the MEOLUT Prototype and the MCC
2.2.3.4.1 New SITs number for the transmission of SAR Distress Data between MEOLUT and MCCs
2.2.3.4.1 Several MF# number in SIT for located SAR distress data
2.2.3.4.1 Several MF# number in SIT for unlocated SAR distress data
2.2.3.4.2 New SIT number for external TOA/FOA Pairs Request
2.2.3.4.2 Several MF# number in external TOA/FOA Pairs Request Message
2.2.3.4.3 New SIT number for external TOA/FOA Pairs Message
2.2.3.4.3 Several MF# number in external TOA/FOA Pairs Message
2.2.3.4.4 New SIT number for Satellite Ephemeris Message
2.2.3.4.4 Several MF# number in Satellite Ephemeris Message
2.2.3.4.5 New SIT number for MEOSAR Satellites Status Message
2.2.3.4.5 Several MF# number in MEOSAR Satellites Status Message
2.2.3.4.6 New SIT number for Service Bulletin Message
2.2.3.4.6 Several MF# number in Service Bulletin Message
2.2.3.5 Several MF# number in message fields descriptions
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 8 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
2. EXTERNAL INTERFACE DEFINITION
2.1 OVERVIEW
2.1.1 Terminology
For aspects related to interfaces and data definition the following levels exist (based on Galileo interface definitions):
1. Interface: as the whole means for communication or interaction between interfaced elements. Example: FES-RXS interface
2. Link: as a connection inside an interface for a given kind of information transfer. Examples: a LAN network link for transferring data between two Sets or a 1 PPS connection.
3. Channel: port-to-port connection paths within a given link. For data transfers, a channel is usually a logical connection through the network. Data transfers through the channel are usually implemented by means of messages.
4. Data: encoded information that flows through the channel. Example: Data are usually encapsulated into the message body. Note that a given data can flow through (a cascade) of different interfaces-links-channels.
2.1.2 Interface overview
The MEOLUT high-level physical architecture is described in Figure 1 below and presents the main components and associated interfaces.
The external interfaces, object of this ICD, are highlighted in red.
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 9 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
Figure 1: MEOLUT high-level physical architecture
The figure shows that the MEOLUT Prototype external interfaces are:
1. SAR downlink SIS: SAR/Galileo Signal in Space in L-band relaying the beacon distress signals. In the final operational MEOLUT, this could also apply to signals relayed by the DASS system.
2. GPS SIS: Navigation signals of the GPS system used for time synchronisation purposes. In the final operational MEOLUT, this could be replaced by navigation signals relayed by the Galileo system.
3. Interface with C/S: External communications with the C/S MCC.
Data flows MEOLUT components
Front-End Set (FES)
CoreProcessor Set
(CPS)
MEOSAR satellites
GPSconstellation
SAR Downlink SIS
GPSSIS
Network - MCC
SAR Streams
Raw STS Parameters
Frequency Standard
1PPS
RFE Command
DDC Response
DDC Command
RXS Response RXS Command
SAR Distress Data
RFE Response
Receiver Set (RXS)
Ext. TOA/FOARequest
Satellite Ephemeris,Satellite Status,TBD[Service Bulletins]
External TOA/FOA Pairs
UTC Time
Downlink Description
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 10 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
2.2 MEOLUT EXTERNAL INTERFACES
2.2.1 SAR downlink SIS
SAR/Galileo SIS interface is fully described in Volume 2 of AD-01. This interface covers the LHCP L-band (1544.100 MHz) transmission of the SAR/Galileo signals from the Galileo satellites relaying distress beacon signals.
DASS SIS is described in section 2.2.1.1.
2.2.1.1 Signal in DASS POC satellites
The DASS signals are SAR signals relayed by repeaters on board several GPS satellites.
DASS Repeater Configuration A diagram of the space segment DASS POC functions is shown in Figure 2.
Figure 2: Space Segment Diagram of DASS Proof of Concept Functions
≈
Local Oscillator
Generation
3 dB BW = 200 kHz
LNA Up
Converter
2226.472340 MHz
Power Amp.
406.05 MHz
Down Converter
UHF Antenna LHCP
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 11 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
The following parameters are provided for establishing link budgets to track the DASS POC satellites.
• 406 MHz Antenna Polarization is LHCP
• G/T = -17.7 dB/K at 406 MHz
• Receiver operates with AGC
• Channel bandwidth approximately 200 kHz
• Receiver is frequency translation from 406 MHz to S-band with no re-modulation.
• S-band downlink antenna is LHCP
• Downlink EIRP is ≈ 10dBW
The receiver frequency conversion process inverts the 406.0 to 406.1 MHz distress beacon band as it is being translated to S-Band as follows.
fSb = 2226.472340 + (406.05 - fb)
where:
fSb = beacon frequency embedded in S-band downlink
fb = beacon transmit frequency (from 406.0 to 406.1 MHz)
(i.e. for fb = 406.025 MHz, fSb= 2226.497340 MHz)
406.05 MHz = center of beacon transmit band
2226.472340 MHz = center of beacon band in the S-band downlink
The DASS POC frequency translation is graphically shown in the following diagram.
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 12 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
406.0 406.1 406.05
2226.4723402226.522340 2226.422340
All frequency in MHz
Figure 3: DASS signal frequency translation
As noted above, the repeater bandwidth is 200 kHz. The S-band downlink emission, therefore, spans a frequency range from approximately 2226.372340 to 2226.572340 MHz. Emitters operating in the mobile service in the region just above 406.1 MHz are often seen at frequencies below 2226.422340 MHz.
2.2.2 GPS SIS
This interface is fully described in RD-06. This corresponds to the definition of the navigation signals for the GPS system. This navigation signal is used for time synchronisation of the TFR subsystem through a standard GPS receiver.
In the future, a MEOLUT could replace the GPS receiver by a Galileo receiver to perform the same function.
2.2.3 MCC
2.2.3.1 Overview of the interface
This interface is used to transmit alerts and other data to the C/S MCC and to receive from it certain parameters (RD-01).
In C/S, the definition of the interface between LUTs and MCCs is not standardised and is left for the national administrations to define (see 3.4.1, 3.5.1 of RD-03). The interface between MCCs, however, is formally standardised by C/S within RD-02. The data transmitted between MCCs is very often of the same characteristics as the data exchanged between a LUT and its MCC. Therefore, many LUTs use the same type of interface to communicate with their MCC in order to facilitate implementation.
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 13 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
This document assumes that the interface between the MEOLUT Prototype and its corresponding MCC will follow the specifications defined in RD-02. There are, however, certain characteristics that are particular to the MEOSAR system. Therefore, the full description of the different messages is not included in this document (refer to RD-02), only updates or additions are proposed to cover the functionality of the MEOSAR system.
For convenience, the description for this interface follows the standard interface description used in RD-02.
This interface is composed of a single link and a single channel (as defined in section 2.1).
2.2.3.2 Physical characteristics
The physical characteristics for the connection between the MEOLUT Prototype and the MCC shall be as follows [TBC]:
• Ethernet compliant to norm IEEE 802.3
• 100 Mbit/s, mode and features TBD
• cables are shielded twisted pair category 5 with RJ45 connector
• both elements provide Ethernet interface as a female RJ45 socket of MDI type
Details on the exact configuration, security and detailed characteristics are [TBD].
2.2.3.3 Protocols
2.2.3.3.1 Low-level protocols
Communications between the MEOLUT Prototype and the MCC shall be based on TCP/IP.
Details on the exact configuration, security and detailed characteristics are [TBD].
2.2.3.3.2 High-level protocols
The protocols used by MCC to communicate with each other are X.25 Communications (being phased-out), File Transfer Protocol (FTP) Communications, Telex Communications (being phased-out) and AFTN Communications (being upgraded to AMHS).
Communications between the MEOLUT Prototype and the MCC shall be based on FTP as described in RD-02.
Details on the exact configuration, security and detailed characteristics are [TBD].
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 14 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
2.2.3.4 Messages
The following sections describe the different messages that are necessary to be exchanged between the MEOLUT Prototype and the MCC. Refer to section 2.2.3.5 for a description of modified or new Message Fields.
2.2.3.4.1 SAR Distress Data
The Cospas-Sarsat inter-MCCs interface for exchanging 406 MHz SAR alert data uses SITs 122-133. In practice, a LUT only needs to transmit two different types of SAR Alerts to its associated MCC: Unlocated Alerts, and Located Alerts (SITs 122 and 125 respectively).
New SITs (numbers TBD) for the transmission of 406 MHz Beacon Alert data from the MEOLUT to its associated MCC shall be transmitted in accordance with Table 1 for Located Alerts and Table 2 for Unlocated Alerts:
MESSAGE FORMAT MF# TITLE MESSAGE HEADER 1 MESSAGE NUMBER
2 REPORTING MCC
3 MESSAGE TRANSMIT TIME
SIT HEADER 4 SIT
5 SIT DESTINATION
8 NUMBER OF ALERTS WITH DOPPLER POSITIONS
SOLUTION HEADER 11 SOURCE ID
23 406 MESSAGE
21 NUMBER OF POINTS
TBD SATELLITES FOR RLM
BURST DATA TBD BEACON TRANSMIT TIME
TBD NUMBER OF TOA/FOA PAIRS
LINK DATA 6 SPACECRAFT ID
TBD UPLINK TOA
TBD UPLINK FOA
TBD CARRIER TO NOISE DENSITY RATIO
REPEAT MFs OF LINK DATA AS REQUIRED BY “NUMBER OF TOA/FOA PAIRS”
REPEAT MFs OF BURST DATA AND LINK DATA AS REQUIRED BY “NUMBER OF POINTS”
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 15 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MESSAGE FORMAT MF# TITLE SOLUTION DATA 25 LATITUDE
26 LONGITUDE
TBD ALTITUDE
TBD ESTIMATED ERROR RADIUS1
REPEAT MFs OF SOLUTION HEADER, BURST DATA, LINK DATA AND SOLUTION DATA AS REQUIRED BY MF #8 OR #10
SIT TRAILER 42 ENDSIT
MSG TRAILER 43 ENDMSG
Table 1: Message Content for SAR Distress Data Message for Located Alerts
Note that “ALTITUDE” is also included in the Solution Data in order to provide a 3D location. Compared to the LEOSAR and GEOSAR system, alerts are no longer grouped by “SPACECRAFT ID” given that, in general, several satellites will be simultaneously in view of a beacon or MEOLUT.
A new SIT (number TBD) would be used for alerts where location information based on TOA/FOA is not available (Table 2).
MESSAGE FORMAT MF# TITLE MESSAGE HEADER 1 MESSAGE NUMBER
2 REPORTING MCC
3 MESSAGE TRANSMIT TIME
SIT HEADER 4 SIT
5 SIT DESTINATION
10 NUMBER OF ALERTS WITHOUT DOPPLER POSITIONS
SOLUTION HEADER 11 SOURCE ID
23 406 MESSAGE
21 NUMBER OF POINTS
TBD SATELLITES FOR RLM
BURST DATA TBD BEACON TRANSMIT TIME
TBD NUMBER OF TOA/FOA PAIRS
1 Represents the 50%-probability area of the real beacon location (centred at the calculated location). .
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 16 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MESSAGE FORMAT MF# TITLE LINK DATA 6 SPACECRAFT ID
TBD UPLINK TOA
TBD UPLINK FOA
TBD CARRIER TO NOISE DENSITY RATIO
REPEAT MFs OF LINK DATA AS REQUIRED BY “NUMBER OF TOA/FOA PAIRS”
REPEAT MFs OF BURST DATA AND LINK DATA AS REQUIRED BY “NUMBER OF POINTS”
REPEAT MFs OF SOLUTION HEADER, BURST DATA AND LINK DATA AS REQUIRED BY MF #10
SIT TRAILER 42 ENDSIT
MSG TRAILER 43 ENDMSG
Table 2: Message Content for SAR Distress Data Message for Unlocated Alerts
2.2.3.4.2 External TOA/FOA Pairs Request
For the requests from the MEOLUT to the MCC to provide TOA/FOA pairs originating at other MEOLUTs corresponding to a particular burst transmission, a new SIT (number TBD) is proposed that would be composed in accordance with the following table:
MESSAGE FORMAT MF# TITLE MESSAGE HEADER 1 MESSAGE NUMBER
2 REPORTING MCC
3 MESSAGE TRANSMIT TIME
SIT HEADER 4 SIT
5 SIT DESTINATION
SIT BODY 11 SOURCE ID
TBD NUMBER OF ALERTS
REQUEST DATA 22 BEACON ID
TBD BEACON TRANSMIT TIME
REPEAT MFs OF REQUEST DATA AS REQUIRED BY “NUMBER OF ALERTS”
SIT TRAILER 42 ENDSIT
MSG TRAILER 43 ENDMSG
Table 3: Message Content for External TOA/FOA Pairs Request Message
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 17 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
A new MF has been added “NUMBER OF ALERTS” to avoid confusion with “NUMBER OF POINTS”, which refer to transmissions of the same beacon.
2.2.3.4.3 External TOA/FOA Pairs Message
The sharing of TOA/FOA information among MEOLUTs is planned for the MEOSAR system in order to maximise beacon localisation and expand the coverage of MEOLUTs (see §8.1 of RD-09).
The new SIT (number TBD) is proposed that would be composed of the following Message Fields:
MESSAGE FORMAT MF# TITLE MESSAGE HEADER 1 MESSAGE NUMBER
2 REPORTING MCC
3 MESSAGE TRANSMIT TIME
SIT HEADER 4 SIT
5 SIT DESTINATION
TBD NUMBER OF ALERTS
RESPONSE DATA 11 SOURCE ID
22 BEACON ID
TBD BEACON TRANSMIT TIME
TBD NUMBER OF TOA/FOA PAIRS
LINK DATA 6 SPACECRAFT ID
TBD UPLINK TOA
TBD UPLINK FOA
TBD CARRIER TO NOISE DENSITY RATIO
REPEAT MFs OF LINK DATA AS REQUIRED BY “NUMBER OF TOA/FOA PAIRS”
REPEAT MFs OF RESPONSE DATA AND LINK DATA AS REQUIRED BY “NUMBER OF ALERTS”
SIT TRAILER 42 ENDSIT
MSG TRAILER 43 ENDMSG
Table 4: Message Content for External TOA/FOA Pairs Message
The “BEACON TRANSMIT TIME” is used to identify a specific burst transmission of a particular beacon. The “UPLINK TOA” and “UPLINK FOA” provide the Time Of Arrival and Frequency Of Arrival of the beacon burst at the satellite.
“SOURCE ID” provides information about the originating MEOLUT of the TOA/FOA pairs.
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 18 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
2.2.3.4.4 Satellite Ephemeris Message
This message intends to provide the MEOLUT Prototype with information regarding Galileo satellites ephemeris. A new Subject Indicator Type (SIT, see RD-02) message is proposed (SIT number TBD), similar to existing SIT numbers 215 and 216, with the following fields:
MESSAGE FORMAT MF# TITLE MESSAGE HEADER 1 MESSAGE NUMBER
2 REPORTING MCC
3 MESSAGE TRANSMIT TIME
SIT HEADER 4 SIT
5 SIT DESTINATION
44 NUMBER OF SPACECRAFT
TBD UTC CONVERSION
SIT BODY 6 SPACECRAFT ID
TBD EPHEMERIS
REPEAT MFs OF SIT BODY AS REQUIRED BY “NUMBER OF SPACECRAFT”
SIT TRAILER 42 ENDSIT
MSG TRAILER 43 ENDMSG
Table 5: Message Content for Satellite Ephemeris Message
The new “UTC CONVERSION” MF is included in order to be able to refer to the MEOSAR System Time in which ephemeris is provided, considering that the MEOLUT operates in UTC.
The new “EPHEMERIS” MF is included to adequate satellite positioning information to the usual format transmitted by MEOSAR constellations in their navigation message.
The “SPACECRAFT ID” (MF #6) correspondence table has been expanded in order to be able to identify MEOSAR satellites (see section 2.2.3.5).
2.2.3.4.5 Satellite Status
Satellite status is currently provided in text form through SIT 605. The contents of the text message are described in Annex II / F of RD-08.
For Galileo, the Galileo Ground Mission Segment is expected to provide useful status information like:
- current satellite status: for each satellite, SAR functions available for Forward Link, Navigation functions available for Return Link
- service bulletins: planned Forward Link outages, planned Return Link outages, planned RLSP-GMS changes
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 19 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
This status information should be provided to the MEOLUT in order to optimise operations like satellite tracking.
Given that the number of satellites will significantly increase with the arrival of the MEOSAR constellations, an alternative to provide increased automation by means of specific Message Fields (and SITs) is considered.
The new SIT (number TBD) for Satellite Status would follow Table 6:
MESSAGE FORMAT MF# TITLE MESSAGE HEADER 1 MESSAGE NUMBER
2 REPORTING MCC
3 MESSAGE TRANSMIT TIME
SIT HEADER 4 SIT
5 SIT DESTINATION
44 NUMBER OF SPACECRAFT
SIT BODY 6 SPACECRAFT ID
TBD FORWARD LINK STATUS
TBD CENTER FREQUENCY
TBD POLARIZATION
TBD GAIN CONTROL
TBD BANDWIDTH
TBD TRANSPONDER DELAY
TBD RETURN LINK STATUS
REPEAT MFs OF SIT BODY AS REQUIRED BY “NUMBER OF SPACECRAFT”
SIT TRAILER 42 ENDSIT
MSG TRAILER 43 ENDMSG
Table 6: Message Content for Satellite Status Message
2.2.3.4.6 Service Bulletins
A new SIT for Service Bulletins has been defined.
Following the strategy for the Satellite Status Message, in which the NARRATIVE field has been replaced by dedicated fields allowing automatic processing, the proposed message structure is defined in
This new SIT (number TBD) for Service Bulletins would follow Table 7:
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 20 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MESSAGE FORMAT MF# TITLE MESSAGE HEADER 1 MESSAGE NUMBER
2 REPORTING MCC
3 MESSAGE TRANSMIT TIME
SIT HEADER 4 SIT
5 SIT DESTINATION
TBD PLANNED GMS-RLSP INTERFACE OUTAGE
TBD GMS-RLSP I/F OUTAGE START TIME
TBD GMS-RLSP I/F OUTAGE END TIME
44 NUMBER OF SPACECRAFT
SIT BODY 6 SPACECRAFT ID
TBD STATUS OF MANOEUVRE
TBD TYPE OF MANOEUVRE
TBD SAR FORWARD LINK ACTIVE DURING MANOEUVRE
TBD SAR RETURN LINK ACTIVE DURING MANOEUVRE
TBD MANOEUVRE START TIME
TBD MANOEUVRE END TIME
TBD TIME OF NEW EPHEMERIS
REPEAT MFs OF SIT BODY AS REQUIRED BY “NUMBER OF SPACECRAFT”
SIT TRAILER 42 ENDSIT
MSG TRAILER 43 ENDMSG
Table 7: Message Content for Service Bulletin Message
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 21 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
2.2.3.5 Message Fields Description
This section is an update of Annex B of RD-02. It contains modifications of existing Message Fields (MF) or additions required to transmit information which is specific of the MEOSAR system. MF# NAME CONTENT CHARACTER TEXT 6 SPACECRAFT ID SARSAT = 001 -> 099
COSPAS = 101 -> 199 GOES = 201 -> 220 LUCH-M = 221 -> 240 INSAT-2, INSAT-3 = 241 -> 260 MSG = 261 -> 280 MEO PRN x = 300 + x (MEO includes GPS, GLONASS, Galileo)2 (See Annex II/F in C/S A.001 for spacecraft status)
nnn
25 LATITUDE (DEGREES)3
LAT: ±00.000 -> ±90.000 WHERE: + = NORTH and - = SOUTH
snn.nnnn
26 LONGITUDE (DEGREE)3
LONG: ±000.000 -> ±180.000 WHERE: + = EAST and - = WEST
snnn.nnnn
2 From RD-07:
PRN Slot Assignment 1-37 GPS/GPS Reserved 38-61 GLONASS 62-119 Future GNSS (to include Galileo) 120-138 GEO/WAAS 139-210 Future GNSS/GEO/WAAS/Pseudolites 3 Expanded resolution to provide increased accuracy.
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 22 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MF# NAME CONTENT CHARACTER TEXT [TBD] BEACON
TRANSMIT TIME YEAR = 00->99 DAY (JULIAN) = 001-> 366 UTC – HRS = 00 -> 23 MINS = 00 -> 59 SECONDS = 00 -> 59 Note: “Beacon transmit time” identifies a particular beacon burst transmission. For burst transmission association among LUTs a ±1 s tolerance shall be considered. If Beacon Transmit Time is all set to zeroes in a request, it refers to all beacon burst transmissions of the beacon alert since the last request.
nn nnn nnnnnn
[TBD] NUMBER OF TOA/FOA PAIRS
01 -> 99 nn
[TBD] UPLINK TOA YEAR = 00->99 DAY (JULIAN) = 001-> 366 UTC – HRS = 00 -> 23 MINS = 00 -> 59 SECONDS = 00.000000 -> 59.999999
nn nnn nnnnnn.nnnnnn
[TBD] UPLINK FOA (Hz)
000000000.00 Hz -> 999999999.99 Hz nnnnnnnnn.nn
[TBD] NUMBER OF ALERTS
01 -> 99 nn
[TBD] UTC CONVERSION
# Parameter Definition Scale factor
Unit
1 A0 Constant term of polynomial 2-30 seconds snnnnnnnnnn 2 A1 1st order term of polynomial 2-50 s/s snnnnnnn 3 ∆tLS Delta time due to leap seconds 1 seconds snnn 4 t0t Reference time for UTC data 1 seconds nnnnnn 5 WNt UTC reference Week Number 1 weeks nnn 6 WNLSF Week Number of the Leap Second 1 weeks nnn 7 DN Day Number of the Leap Second 1 …7 days n 8 ∆tLSF Delta time due to leap second 1 seconds snnn [TBD] EPHEMERIS # Parameter Definition Scale
factor Unit
1 M0 Mean Anomaly at Reference Time 2-31 Semi-circles snnnnnnnnnn 2 ∆n Mean Motion Difference From Computed
Value 2-43 Semi-circles/s snnnnn
3 e Eccentricity 2-33 N/A nnnnnnnnnn 4 (A)1/2 Square Root of the Semi-Major Axis 2-19 Meters1/2 nnnnnnnnnn 5 (OMEGA)0 Longitude of Ascending Node of Orbit 2-31 Semi-circles snnnnnnnnnn
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 23 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MF# NAME CONTENT CHARACTER TEXT Plane at Weekly Epoch
6 i0 Inclination Angle at Reference Time 2-31 Semi-circles snnnnnnnnnn 7 ω Argument of Perigee 2-31 Semi-circles snnnnnnnnnn 8 OMEGADOT Rate of Right Ascension 2-43 Semi-circles/s snnnnnnn 9 IDOT Rate of Inclination Angle 2-43 Semi-circles/s snnnn 10 Cuc Amplitude of the Cosine Harmonic
Correction Term to the Argument of Latitude
2-29 Radians snnnnn
11 Cus Amplitude of the Sine Harmonic Correction Term to the Argument of Latitude
2-29 Radians snnnnn
12 Crc Amplitude of the Cosine Harmonic Correction Term to the Orbit Radius
2-5 Meters snnnnn
13 Crs Amplitude of the Sine Harmonic Correction Term to the Orbit Radius
2-5 Meters snnnnn
14 Cic Amplitude of the Cosine Harmonic Correction Term to the Angle of Inclination
2-29 Radians snnnnn
15 Cis Amplitude of the Sine Harmonic Correction Term to the Angle of Inclination
2-29 Radians snnnnn
16 t0e Ephemeris Reference time 1 seconds nnnnnn 17 WNe Ephemeris reference week number 1 weeks nnnn 18 IOD Issue of Ephemeris Data N/A N/A nnn [TBD] ALTITUDE4 ±00000 m -> ±99999 m snnnnn [TBD] SATELLITES
FOR RLM 10 PRN numbers (see MF 6) (Default values are 000)
nnnbnnnbnnnbnnnbnnnbnnnbnnnbnnnbnnnbnnn
[TBD] FORWARD LINK STATUS
0 -> 9 0: Normal 1: Degraded 2: Unusable 3-9: Spare
n
[TBD] CENTER FREQUENCY
0000000000.00 Hz -> 9999999999.99 Hz nnnnnnnnnn.nn
4 Signed value needed, as some geographic areas on the geoid are below altitude zero of the reference ellipsoid.
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 24 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MF# NAME CONTENT CHARACTER TEXT [TBD] POLARIZATION 0 -> 9
0: RHCP 1: LHCP
n
[TBD] GAIN CONTROL 0 -> 9 0: Automatic 1: Fixed 2-9: Spare
n
[TBD] BANDWIDTH 000 kHz -> 999 kHz nnn [TBD] TRANSPONDER
DELAY 000.00 µs -> 999.99 µs nnn.nn
[TBD] RETURN LINK STATUS
0 -> 9 0: Normal 1: Degraded 2: Unusable 3-9: Spare
n
[TBD] CARRIER TO NOISE DENSITY RATIO
00.00 dBHz -> 99.99 dBHz nn.nn
[TBD] ESTIMATED ERROR RADIUS
00.00 km -> 99.99 km nn.nn
[TBD] PLANNED GMS-RLSP INTERFACE OUTAGE
0=no 1=yes (+ spare values up to 9)
n
[TBD] GMS-RLSP I/F OUTAGE START TIME
YEAR = 00->99 DAY (JULIAN) = 001-> 366 UTC – HRS = 00 -> 23 MINS = 00 -> 59 SECONDS = 00 -> 59
nn nnn nnnnnn
[TBD] GMS-RLSP I/F OUTAGE END
YEAR = 00->99 DAY (JULIAN) = 001-> 366
nn nnn
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 25 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MF# NAME CONTENT CHARACTER TEXT TIME UTC – HRS = 00 -> 23
MINS = 00 -> 59 SECONDS = 00 -> 59
nnnnnn
[TBD] STATUS OF MANOEUVRE
0=scheduled 1=executed 2=cancelled (+ spare values up to 9)
n
[TBD] TYPE OF MANOEUVRE
0=in plane 1=out of plane 2=both (+ spare values up to 9)
n
[TBD] SAR FORWARD LINK ACTIVE DURING MANOEUVRE
0=unavailable 1=available (+ spare values up to 9)
n
[TBD] SAR RETURN LINK ACTIVE DURING MANOEUVRE
0=unavailable 1=available (+ spare values up to 9)
n
[TBD] MANOEUVRE START TIME
YEAR = 00->99 DAY (JULIAN) = 001-> 366 UTC – HRS = 00 -> 23 MINS = 00 -> 59 SECONDS = 00 -> 59
nn nnn nnnnnn
[TBD] MANOEUVRE END TIME
YEAR = 00->99 DAY (JULIAN) = 001-> 366 UTC – HRS = 00 -> 23 MINS = 00 -> 59 SECONDS = 00 -> 59
nn nnn nnnnnn
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 26 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
MF# NAME CONTENT CHARACTER TEXT
[TBD] TIME OF NEW EPHEMERIS
YEAR = 00->99 DAY (JULIAN) = 001-> 366 UTC – HRS = 00 -> 23 MINS = 00 -> 59 SECONDS = 00 -> 59
nn nnn nnnnnn
Table 8: New or Modified Message Fields
GISAR
Ref.:
Iss./Rev.:
Date:
GIS-REQ-004-IE
2.1
12/05/2006
MEOLUT Prototype External Interface Control Document Page 27 de 27 INDRA ESPACIO S.A. owns the copyright of this document which shall not be used for any purpose other than for which it is supplied and shall not be copied or given to any person or organization without written authorization from the owner.
END OF DOCUMENT
Top Related