First broadcast of SBAS-SACCSA test signal in the Caribbean, Central America and South America

Transcription

1 First broadcast of SBAS-SACCSA test signal in the Caribbean, Central America and South America A. Cezón, I. Alcantarilla, J. Caro, J. Ostolaza, GMV, Tres Cantos, Spain; C. Soddu, INMARSAT, U.K; L. Andrada, AENA, Spain; F. Azpilicueta, UNLP-CONICET, GESA, Argentina BIOGRAPHIES Ana Cezón has a M.Sc. in Physics. She is working at GMV (Spain) in the GNSS Navigation Area, where she started her career in She has worked on ESTB, EGNOS and Galileo programs, CELESTE, SACCSA and GNSS evolution programs projects (MRS, GSC, etc). She is responsible for GMV GNSS activities in Latin- America. Ignacio Alcantarilla has a degree in Aeronautical Engineering. He has been working in SBAS for more than 10 years: EGNOS, SACCSA, SDCM, others. He has been the technical and project manager of the CPFPS (the core of the EGNOS system). From 2008, he is in charge of the magicsbas product and team. He accomplished the transformation of magicsbas into a real-time testbed fed with real-time data obtained from Internet (NTRIP format) and with a SISNET broadcast. Recently, he has been involved in business development activities around magicsbas. José Caro took his Ph.D. in Theoretical Physics in He joined the company GMV in Since then, he has worked in satellite navigation related projects, most of them in the EGNOS program, the European SBAS, being one of the designers and developers of the EGNOS central processing subsystem. He is currently the head of the GNSS Advanced Systems Division at GMV. Claudio Soddu is the Director of Navigation and Operational Services at Inmarsat. He was responsible for the Inmarsat-4 navigation transponder design, implementation, testing and service definition and is currently responsible for the operations of the Inmarsat navigation transponders used by EGNOS and WAAS. Luis Andrada-Márquez is Aeronautical Technical Expert in NAV-AIDS, and Fly Engineer. Currently he is Head of the GNSS Operations Department within the GNSS Division of AENA. Francisco Azpilicueta holds a PhD on Astronomy by Universidad Nacional de La Plata - CONICET. In 2000 he joined the Space Geodesy and Aeronomy (GESA) Laboratory. His expertise encompasses ionosphere modeling and satellite navigation. ABSTRACT For the first time in the Caribbean, Central America and South America regions a GEO satellite SBAS test signal was received. The demonstration of a Satellite-Based Augmentation System of the SACCSA Project (SBAS- SACCSA) in test mode was broadcast during the Seventh Meeting of the Coordination Committee (RCC/7) of ICAO Regional Project RLA/03/902 SACCSA (Solución de Aumentación para el Caribe, Centro y Sudamérica / Augmentation Solution for the Caribbean, Central and South America), held in San Carlos de Bariloche, Argentina, from 14 to 15 October The RCC/7 Meeting was organized by the International Civil Aviation Organization (ICAO) and hosted by Argentina State through ANAC (Administración Nacional de Aviación Civil / National Civil Aviation Administration). The demonstration of test signal was presented to participants at the RCC/7 Meeting of the following States and International Organization: Argentina, Bolivia, Brazil, Colombia, Costa Rica, Guatemala, Panama, Spain, Venezuela, COCESNA, IFALPA and ICAO. This project is managed by ICAO and technically coordinated by AENA (Aeropuertos Españoles y Navegación Aérea, Spain). To success in this relevant and historical event in the regions it has been important the support of ICAO, AENA and GESA laboratory (from the Facultad de Ciencias Astronómicas y Geofísicas de la Universidad Nacional de La Plata, Argentina ), as well as the support of the Argentina State represented through ANAC. For years, ICAO has supported the GNSS implementation and promotes the studies to analyze the implementation of a specific SBAS in the Caribbean, Central and South America Regions, and this initiative is a huge step towards this objective. SACCSA project objective is to study the improvement of the air navigation environment in the Caribbean and South America (CAR/SAM) Regions with a SBAS solution. The project is founded by ICAO (International Civil Aviation Organization) on behalf of the participants/member States/International Organizations of

2 the SACCSA Project. As part of this project a feasibility analysis for a SBAS is performed, paying particular attention to the ionosphere, integrity and safety aspects. The success of the demonstration was possible thanks to the collaboration between GMV and Inmarsat companies, which involved integrating their different technologies. GMV provided its new SBAS processing centre, magicsbas ( which accepts real-time data from any place in the world; while Inmarsat provided its SBAS signal generator and the space capacity the navigation transponder on the Inmarsat-3F4 positioned over the Americas continent. The purpose of the transmission was to complete the integration of magicsbas with Inmarsat GEO payloads and to show that the performance of SBAS-SACCSA test signals is affordable with minimum infrastructure investments. The presented technology constitutes a fundamental asset for those entities considering the deployment of an SBAS in any region. magicsbas is an augmentation system demonstrator that collects GPS and GLONASS data (measurements and ephemeris) from a regional network of reference stations, computes satellite orbits and clocks, ionospheric and integrity information, and broadcasts messages to the final user in this case via GEO broadcast. Data from IGS, IBGE (Instituto Brasileiro de Geografia e Estatística), UNESP (Universidade Estadual Paulista), RAMSAC (IGNA: Instituto Geográfico Nacional de Argentina), and PRSN (Universidad de Puerto Rico) was used as reference stations for this demonstration. magicsbas was adapted to CAR/SAM regions, including a first adaptation of the ionosphere algorithms for equatorial regions. The results presented in the paper are not representative of the performances that could be obtained from other medium latitude SBAS (like WAAS or EGNOS) as the iono algorithms in magicsbas are not the same. Please, note that at equatorial latitudes the ionospheric activity can become a significant problem on GNSS and in particular to SBAS systems, so ionospheric algorithm plays a special role on this type of demonstrations. This paper describes the demonstration performed and presents the results obtained both in-situ in San Carlos de Bariloche, Argentina and also from the data collected in Madrid, Spain which was in the footprint of the GEO satellite. Additionally, data from different receivers in the regions were processed and SBAS messages were applied. The paper also includes an analysis of the performances obtained with those receivers when SBAS corrections are used and an extrapolation to the entire regions. Obtained performances in terms of accuracy, availability, continuity and integrity is being presented at user level and also at pseudorange level (satellite and IGP). The article shows the safety measures taken during the demonstration, not only for users in the targeted region but to other areas with their own SBAS. The paper identifies also the procedures selected to assess the correct implementation of the demonstration showing a set of results obtained during the mentioned GEO broadcast. INTRODUCTION The objective of this paper is to describe the SBAS demonstration performed during the SACCSA coordination meeting (RCC/7) held in San Carlos de Bariloche, Argentina, from 14 to 15 October The demonstration consisted in the broadcast of a GEO SBAS test signal for the first time over the Latinoamerica (CAR/SAM) Region. The demonstration of test signal was presented to participants at the RCC/7 Meeting of the following States and International Organization: Argentina, Bolivia, Brazil, Colombia, Costa Rica, Guatemala, Panama, Spain, Venezuela, COCESNA, IFALPA and ICAO. To success in this relevant and historical event in the regions it has been important the support of ICAO, AENA and GESA laboratory (from the Facultad de Ciencias Astronómicas y Geofísicas de la Universidad Nacional de La Plata, Argentina ), as well as the support of the Argentina State represented through ANAC. During the demonstration a video was filmed in the facilities of GMV in Tres Cantos, Spain; of Inmarsat, in Fuccino, Italy; and also in the RCC/7 coordination meeting sessions in San Carlos de Bariloche, Argentina. This video is loaded in the following web link ( For the demonstration GMV and Inmarsat integrated their different technologies. A detailed description of the technologies used is included in this paper (next section). The paper includes the results obtained during the demonstration. A performance analysis of the test signal is performed with data obtained in-situ in San Carlos de Bariloche and also with data collected in Madrid. Finally, a section describing the safety mechanisms adopted during the demonstration is included to assess that it does not interfere with other operational SBAS. DEMONSTRATION ARQUITECTURE This section describes the high level view of the infrastructure used for the demonstration. As commented in the introduction, the demo was done thanks to the integration of different technologies provided by GMV and Inmarsat. GMV provided its SBAS processing centre, magicsbas [2], which accepts real-time data from any place in the world and magicgemini [3] which allows the monitoring and visualization of real time obtained performances; while Inmarsat provided its SBAS signal

3 generator and the space capacity the navigation transponder on the Inmarsat-3F4 (PRN 122) positioned over the Americas continent. magicsbas high level view The magicsbas scheme is based on the collection of measurements and data from existing reference stations in the Internet in a protocol called NTRIP (for real time processes [1] -). Then magicsbas computes corrections, confidence levels and all additional information required by an SBAS system, using enhanced EGNOS algorithms, and broadcasts this information to the final user via Internet using the format SISNET [5]. magicsbas is MOPS [4] and SARPS compliant. Thus, the magicsbas system is composed of: i. NTRIP data + magicsbas as ground infrastructure; ii. SISNET broadcasts over the Internet which can be accessed via GPRS replacing the SBAS geostationary satellites, and iii. SBAS receiver processing SISNET format such as GMV I-10 Septentrio or standard non- SISNET receivers complemented with SW tools. In this way, magicsbas does not require a dedicated space segment or deployed stations and the transmission can be achieved with full independence from other systems. This leads to a more efficient management and decision driving. Figure 1 magicsbas Overview The real time NTRIP data available at present world-wide and shown in Figure 2 are daily updated from ( l-world.png): For this demonstration, magicsbas data dissemination was done not only in the Internet but also through the Inmarsat-3F4 GEO in SBAS SARPS compliant format. Figure 1 provides a graphical representation of magicsbas elements. It can be seen that magicsbas consists of just one PC with magicsbas SW receiving data from stations in Internet through NTRIP casters. Then, it computes the corrections and integrity and provides the SBAS message to Internet for a later access through mobile technology. Dedicated receivers and magicsbas monitoring are optional enhanced capabilities. Figure 2 NTRIP stations world-wide The full list of the available NTRIP stations with their characteristics (receiver model, system, carrier, position, NTRIP broadcaster ) can also be seen at _world-wide.htm. SBAS signal generator high level view The overall ranging and navigation performance of an SBAS signal broadcast by a bent-pipe transponder is influenced not only by the transponder characteristics, but also by the supporting ground signal generator and timing system. The SBAS signal generator that was used for the demonstration was developed by Inmarsat to properly verify the in orbit performance of the transponder and to allow independent control of the two SBAS signals broadcast from the transponder (L1 and L5).

4 It basically consists of a prototype L1/L5 GPS/SBAS Receiver, an L1/L5 Signal Generator, an L1/L2 GPS Receiver/Antenna and an SBAS Processor/Controller. It is able to interface with existing or off-the-shelf Navigation Land Earth Station (NLES) RF facilities and with an SBAS Terrestrial Communication Network. For the purpose of the demonstration, only the L1 SBAS signal was generated. magicgemini high level view magicgemini is a GMV product that is an operational GNSS performance analysis and monitoring tool specifically designed to meet the needs of air navigation service providers and airspace users. It is MOPS and SARPS compliant. It is composed of a main processing module, magicgemini kernel, the main processing unit of real time or offline data; and a visualization module, magicgemini GTL. Figure 3 L1/L5 SBAS Signal Generator (by GPS Silicon Valley) Figure 4 L1/L5 SBAS Receiver (by Novatel) Inmarsat GEO satellite Inmarsat provided also the space capacity for the demonstration. The navigation transponder on the Inmarsat-3F4 positioned over the Americas continent was used allowing broadcasting the SBAS messages (SARPS compliant) over the Latin-American region. Next figure show the location of 3F4 Inmarsat GEO satellite used for the demonstration (Longitude 54ºW) Figure 7 magicgemini arquitecture Figure 5 Location of Inmarsat GEO satellite The following figure show the Inmarsat communication station located in Fuccino (Italy) and used for the uplink of the SBAS signal for the demonstration. Among its capabilities it is worth highlighting: Online (real time) and Offline processing of scenarios in standard input formats (RINEX, RTCM through NTRIP, Septentrio & Novatel proprietary formats) Direct connectivity capabilities with NTRIP casters. Simultaneous processing of different GNSS solutions (GPS and/or GLONASS solution only, GPS and/or GLONASS SBAS augmented solution) Complete set of relevant Figures of Merit (FOM), including (non exhaustive list) protection levels, navigation system errors, satellite-specific figures of merit (positions, variances), Stanford and Stanford-ESA diagrams, continuity and availability maps and XML reports. magicgemini is a user-friendly tool with a high flexibility that can be configured for multiple uses an allows the user to obtain the maximum information of the GNSS data analyzed. It is especially useful for helping the implementation of the ICAO PBN (Performance Based Navigation) and the transition to GNSS (certification, monitoring, alarms generation, etc). Figure 6 Inmarsat up-link station. Fuccino (Italy)

5 User receivers As part of the demonstration user segment different receivers were used at GMV premises (Madrid, Spain) and in-situ in San Carlos de Bariloche, Argentina: - Septentrio PolaRx2 in Spain - GPS map 276C Garmin in Argentina Results from both receivers will be analyzed hereafter. RESULTS NTRIP reference stations Figure 8 magicgemini tool The reference stations used for the demonstration were mainly GPS-only (there were 3 o 4 GPS+GLO), double frequency geodetic receivers, with a sampling rate of 1Hz, with NTRIP capability and their location is shown in Figure 9. This section includes the analyses performed on the results obtained during the demonstration. It is important to note that the performances are affected by the availability of the receivers used as reference stations (NTRIP) not only due to the receiver capability but also and more important to the used communications (the Internet in this case). This paper is not focused on analyzing the detailed performances obtained; the main objective is to show the results of the integration of two different technologies: magicsbas and GEO signal broadcast. magicsbas obtained performances in South America magicsbas has been adapted to South America with excellent results. magicsbas Data Processing Algorithms has also be modified to customize algorithms to equatorial regions. Figure 9 NTRIP-Stations used in South America These reference stations are from IGS, IBGE (Instituto Brasileiro de Geografia e Estatística), UNESP (Universidade Estadual Paulista), RAMSAC (IGNA: Instituto Geográfico Nacional de Argentina), and PRSN (Universidad de Puerto Rico). The number of stations with good performances in terms of availability of data (including internet input channel) at the time of the demo changed. It was limited in the South of Argentina and the North-East of the region (no stations available at Peru and Ecuador), and it was quite stable in Brazil. This had a direct impact on the results obtained as it will be seen in next sections. These limitations were directly linked with the frequently lost of NTRIP data for some stations due to internet problems, therefore the maximum number of stations available was configured to limit this effect and to include a redundancy to mitigate the risk of losing the data. magicsbas has been run with the available NTRIP data in South-America during September and October Additionally, the SBAS messages computed by magicsbas were broadcast by the Inmarsat GEO satellite from 14 to 15 October Please note that this period is considered as of low-medium ionosphere activity so it is not representative of the worst case scenario. Different analyses were done to study the obtained demo performances: 1) From a GPS receiver installed at GMV premises receiving GEO broadcast data. 2) In-situ SBAS performances in San Carlos de Bariloche, Argentina Hereafter it is included the results obtained in both type of analyse: 1) GEO broadcast signal at GMV premises It this case the GEO signal received at GMV premises were processed with ECLAYR SW to analyse the magicsbas performances obtained. ECLAYR [6] is a GMV tool that is able to analyse the system performances assuming standard local errors. It is important to remark that the performances provided by ECLAYR are

6 independent from the GPS measurements availability at receiver s level and give an estimation of the levels of availability, continuity, accuracy and integrity that could be achieved by a fault-free receiver in the Service Area using only the GPS ephemera and the SBAS corrections broadcast by the corresponding GEO satellite. can be seen, it is in the order of 1-2 meters (horizontal) and 2-3 meters (vertical). Typical results with magicsbas performances when most of the NTRIP stations were available are shown below. Similar results were obtained during other periods of the day. Should you require further analysis, please send an to magicsbas@gmv.com. Figure 10 represents for each user position, the percentage of time that the protection level is lower (better) than the APV-I alarm limit (HAL=40m, VAL=50m) in the service area. This percentage has been computed with respect to the monitored epochs. Note that the percentage enclosed in the red area is 99.9%. Figure 12 South-America magicsbas horizontal accuracy Figure 13 South-America magicsbas vertical accuracy Figure 10 South-America demo magicsbas availability Performance figures highly depend on NTRIP station availability, so different availability figures where obtained. Figure 11 shows the availability obtained during the entire analysed day: It is important to highlight not only the vertical accuracy obtained (of interest for aviation community) but also the horizontal accuracy (sub-metric level at 1 sigma). Please, note that in this analysis local effects are extrapolated assuming fault-free receiver conditions (from an aeronautical point of view). The Safety Index for each position represented in Figure 14 and Figure 15 is defined as the ratio between the position s error and the protection level for each epoch (at 95% percentile). The 95% of the safety index is computed as the worst ratio each epoch, of the safety index computed equivalent to 95% of a Gaussian distribution. As can be seen, integrity is preserved as the index is always below 1 and with an important margin. Vertical Protection levels are about 5 times higher than user errors. Note that Safety Index also represents the margin between integrity and availability. Figure 11 South-America demo magicsbas availability all day The following figures represent both the Horizontal and Vertical Accuracy measured at the percentile 95%. As it

7 Figure 17 South-America magicsbas UDRE values. Figure 14 South-America magicsbas horizontal Integrity Note that magicsbas also provides other real-time products, such as ionosphere corrections and integrity. The next figure shows the differences in ionosphere corrections provided by magicsbas when compared to the igsg IONEX [7] for the same day and locations. Iono Real Time Estimation error (RMS) is below 1 m (6 TECUs) in the region with good coverage. Note that in equatorial regions IONEX are not so accurate due to the complexity of modelling the equatorial anomaly and therefore these errors also include the IONEX local inaccuracy. Figure 15 South-America magicsbas vertical Integrity The following figure represents the Continuity Risk factor for each position. Continuity Risk is defined as the probability of having the service unavailable (protection levels bigger than alert limits, PLs > ALs) during the aircraft landing operation provided the system was available at the beginning of the operation. Figure 18 magicsbas real-time ionosphere Figure 16 South-America magicsbas continuity Next figure shows the satellite monitoring for the period from 10:00 to 15:30 UTC. It includes for each satellite the UDREi indicator computed by magicsbas. At magnetic equatorial latitudes (±10º-15º from magnetic equator) the ionosphere activity can become a limitation on GNSS augmentation systems, and therefore special attention has to be paid to the estimation of ionospheric delays through SBAS-like algorithms and its performances. It is important to note that these results do not demonstrate the technical feasibility of an SBAS in equatorial regions; this feasibility analysis, in particular in Latin America (CAR/SAM Regions), is currently in progress as part of the SACCSA project. In particular we are currently finishing the technical feasibility analysis and it could be presented in future papers, after this information is presented to the SACCSA Members States and ICAO, provided ICAO the disclosure.

8 2) magicsbas in-situ performances Additionally to the analysis performed with the GEO broadcast test signal, the real time performances were analysed and presented to participants at the SACCSA RCC/7 Meeting of the following States and International Organization: Argentina, Bolivia, Brazil, Colombia, Costa Rica, Guatemala, Panama, Spain, Venezuela, COCESNA, IFALPA and ICAO. To success in this relevant and historical event in the regions it has been important the support of ICAO, AENA and GESA laboratory (from the Facultad de Ciencias Astronómicas y Geofísicas de la Universidad Nacional de La Plata, Argentina ), as well as the support of the Argentina State represented through ANAC. The presentation of the demo results were conducted during more or less 2 hours and different results were obtained. Two different analyses were presented in-situ: - On one hand, detailed performances were analysed by using magicgemini tool connected through the Internet in real time to a NTRIP station and processing GPS data and SBAS messages provided by magicsbas. - On the other hand, the GEO test signal was received in-situ with a GPS Garmin receiver (not connected to internet). For doing this, the participants in the meeting went up to the terrace roof of the building to check in-situ the signal reception. Results obtained in both type of analyse are shown hereafter. Next figures present the best and the worst case results obtained during the demonstration in terms of APV-I availability for the first type of analysis. In both cases it is presented the test signal navigation performances as measured from a receiver in Brazil: - on the left, the APV-I availability measured as the probability of having a vertical and horizontal protection level greater than the vertical and horizontal alarm limit respectively (VAL=40m and HAL=50m) - on the right hand of the figure it is shown the region where APV-I requirements are met (in terms of availability), and - in the middle the vertical protection level is compared with the vertical error to analyze the integrity. Figure 19 magicsbas real-time obtained performances. Worst case. Figure 20 magicsbas real-time obtained performances. Best case. Next figure shows the vertical protection level obtained with magicgemini tool in the region in this case at 18:40 LT (Local Time) Figure 21 magicsbas real-time obtained performances. Protection levels 18:40 LT.

9 The GMV s proprietary magicgemini tool [3] is able to analyse the user performances and extrapolate the results to system performances. In this case, NTRIP data from a Brazilian receiver was used as reference, and therefore real local errors from this station are extrapolated to the rest of the region. Additionally, during the demonstration, a user receiver (Garmin) was used to show in-situ the reception of the SBAS GEO test signal broadcast by the Inmarsat 3F4 satellite PRN 122. As commented previously, magicsbas was used as the SBAS processing facility for the demonstration. The GPS receiver was configured to process test SBAS signal (enabling Message type 0 receptions) and PRN 122 (Inmarsat GEO satellite, index 35 in Garmin receivers) was selected. The GEO test signal was properly received by the Garmin receiver. It could be seen that all the GPS satellites in view were monitored by the SBAS test signal broadcast by PRN 122 GEO satellite. MT0 with the highest priority when deciding the next message to broadcast. Furthermore, the configured IGPs do not overlap EGNOS or WAAS, and MT27 has been configured to define a Service Area over South America with the highest possible delta UDRE. Finally, the PRN used is PRN 122. As soon as the signal was started to be broadcast, GMV informed FAA and the European Commission on this fact, the only SBAS that overlapped with the footprint of the GEO used for the demonstration. During the subsequent conversations held with FAA and European Commission representatives, it became apparent that it is currently lacking a formal mechanism to coordinate these kinds of demonstrations involving the broadcast of SBAS GEO test signals. As the interest in SBAS is increasing worldwide, such mechanism should be agreed and established the sooner the better. ADDITIONAL DEMONSTRATIONS Additional demonstrations were performed in Latin- America using magicsbas, but in this case without GEO broadcast. In these cases SBAS computed message is provided in real time through internet: - magicsbas in South America: July-August 2009 for Celeste project. Results presented in IAG2009 Congress [8] - magicsbas in Caribbean, Central and South America: ICAO CNS/ATM Mexico November Next figures show obtained results in both demonstrations. It represents APV-I observed availability figures: Figure 22 GEO signal reception. PRN 122 Please, note that PRN 122 corresponds to Satellite Garmin internal index 35, as it can be seen in the previous figure. SAFETY ASPECTS One of the critical aspects to consider while planning a demonstration with GEO broadcast is to assess that it does not interfere with other operational SBAS and that safety mechanisms are incorporated in the design of the demo to assess that the service provided by the SBAS signal is transmitted in test mode. We identified that the essential points to assess the correct implementation of the demonstration were to ensure that the SBAS service area did not overlap with any of the operational or test SBAS and that MT0 was ensured. These aspects have been carefully tested and barriers were placed. By design, the magicsbas application cannot be configured to run in a mode different of the test one, i.e., broadcasting the SARPS SBAS message type 0 (MT0) every 6 seconds; the message generation module takes Figure 23 South-America magicsbas APV-I availability Figure 24 CAR/SAM magicsbas APV-I availability

10 Finally, a web platform has been created for a new demo in Latin-American running in real time (through internet, no GEO broadcast available). The IP address is :5555 (subject to change). Should you require access to this web page, please send an to magicsbas@gmv.com. CONCLUSIONS For the first time in the Caribbean, Central America and South America regions a GEO satellite SBAS test signal was received. The demonstration of a Satellite-Based Augmentation System of the SACCSA Project (SBAS- SACCSA) in test mode was broadcast during the Seventh Meeting of the Coordination Committee (RCC/7) of ICAO Regional Project RLA/03/902 SACCSA, held in San Carlos de Bariloche, Argentina, from 14 to 15 October The success of the demonstration was possible thanks to the collaboration between GMV and Inmarsat companies, which involved integrating their different technologies. GMV provided its new SBAS processing centre, magicsbas ( which accepts real-time data from any place in the world; while Inmarsat provided its SBAS signal generator and the space capacity the navigation transponder on the Inmarsat-3F4 positioned over the Americas continent. [2] GMV magicsbas web page [3] GMV magicgemini web page [4] Minimum Operational Performance Standards for Global Positioning System/Wide Area Augmentation System Airborne Equipment. RTCA/DO-229C. November 28, [5] Signal-In-Space available over the Internet (SISNET): [6] EGNOS Continuous Logging AnalYseR (ECLAYR): [7] Ionospheric delays in IONEX format: ftp://cddisa.gsfc.nasa.gov/pub/gps/products/ionex/ [8] IAG2009 paper h The purpose of the transmission was to complete the integration of magicsbas with Inmarsat GEO payloads and to show that the performance of SBAS-SACCSA test signals is affordable with minimum infrastructure investments. This paper presents how the demonstration was performed and also the results obtained with this SBAS technology. As it has been shown in this paper, the demonstration was a great success with excellent results and with a minimum cost. The presented technology constitutes a fundamental engineering and demonstration asset for those entities considering the deployment of an operational SBAS in any region. ACKNOWLEDGEMENTS The authors would like to acknowledge ICAO - International Civil Aviation Organization - in particular José Riveros (Technical Co-operation Bureau) and Aldo Martinez- and ANAC Argentina for the support provided during the demonstration and also for this paper. REFERENCES [1] Networked Transport of RTCM via Internet Protocol