gs4EO
A complete suite of Ground Segment products
Deimos Space ground segments are built using a combination of 4EO products, working in a coherent and synchronized way, although all of them can also be used as independent applications. The main characteristics of the gs4EO suite are:
- State-of-the art
- Proven operationally at ESA and Deimos missions
- Flexibility. Scalability. User Friendly.
- Designed for maximising S/C return
Thanks to its modular design, the gs4EO suite of products can be used to customize the ground segment according to the customer’s requirements. The various individual products can be assembled in different ways to implement different deployment configurations, from a complete Ground Segment to a Direct Receiving Station or a single product supporting a specific mission need. This modularity also provides extraordinary flexibility in order to accommodate more than one Earth Observation mission in the ground segment, with different levels of integration.
Each application communicates with the remaining Ground Segment using file-based interfaces, easing its integration with other external solutions. The applications are controlled by means of advanced user interfaces, in many cases web-based, and can be operated remotely.
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The gs4EO suite of products is composed by the following modules:
fly4EO
Flight Dynamics
fly4EO is the stand-alone product in charge of the Flight Dynamics System (FDS) function within the gs4EO suite suite of ground segment products developed by Elecnor Deimos.
It is currently working operationally in the Deimos-2 mission.
The Flight Dynamics System algorithms are decomposed in the Orbit Determination and Control System (ODCS) and the Space Debris Monitoring (SDM), which share common data interfaces and functionalities despite performing different functions within the ground segment. Additionally, the Human Machine Interface (HMI) supports the configuration and control tasks of the system.
The ODCS is divided in:
- Orbit Determination Subsystem, which estimates the parameters needed to describe the trajectory of the spacecraft, as well as other parameters related to the dynamics and observation models. A measure of the accuracy of the estimates is provided in the form of a covariance matrix of the estimated parameters.
- Generation of the ground station Pass Schedules (acquisition plans): these schedules contain all the planned downlink operations at the corresponding ground stations and its associated data (e.g. orbit information).
- Orbit Prediction and Maneuver Optimization, which computes the orbit maneuvers required to reach given orbital targets while satisfying given mission constraints during the operational life of the satellite. The sub-system has also to compute and make available the future trajectory in XML and TLE format for use by other elements of the Ground Segment. This trajectory data is used, for instance, to compute attitude profiles, station coverage, antenna pointing elements and eclipses.
- Flight Dynamics Database (FDDB), a file-based database in which all the relevant FD parameters are stored, together with the historical input/output and configuration data files. The transfer of operations to the backup system requires the transfer of the FDDB.
The main purpose of the Space Debris Monitoring subsystem is to warn FDS operators whenever a collision risk between the spacecraft and another object is detected, providing decision-making support for the triggering of collision avoidance manoeuvres.
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plan4EO
Mission Planning
process4EO
Image processing chain
plan4EO is a mission planning module that can be integrated with other components of the gs4EO suite, as well as with 3rd-party modules, offering different deployment configurations for the customisation of the ground segment according to the customer’s requirements. It is working operationally in Sentinel-2 (A and B spacecraft) and Deimos-2 missions, and provides satellite operators and planning brokers the following capabilities:
- Generation of the Instrument Payload Scenarios: the plans are always conflict-free and generated from the acquisition requests, according to the predefined mission rules and constraints.
- Generation of the ground station Pass Schedules (acquisition plans): these schedules contain all the planned downlink operations at the corresponding ground stations and its associated data (e.g. orbit information).
- Visualization of the plan through a dedicated interface (Planning Exploitation Tool HMI, planET): the HMI includes a Gantt chart, a World Map, and a Plot views where the planning events included in the mission plan are displayed for a selected time period. Status of the spacecraft resources, like battery and power, are also shown.
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Master Broker HMI: an additional HMI handles the different planning tasks (planning process, generation of schedules, retrieval of new orbital information, etc.), allowing their execution in an automatic mode, through a configured agenda, or manually by the operators. It displays the planned and executed tasks, together with their corresponding execution status.
process4EO is Deimos self-developed data processing module, currently in operations in the mission Deimos-2 as part of the gs4EO suite. It enables the processing of the satellite payload raw data to produce image products by performing the following operations on the input data:
- Radiometric calibration, to convert the pixel elements from instrument digital counts into radiance units
- Geometric correction, to eliminate distortions due to misalignments of the sensors in the focal plane geometry
- Automatic geolocation, to compute the geodetic coordinates of the input pixels
- Automatic ortho-rectification, to produce ortho-photos with vertical projection, free of distortions
These steps also generate quality-related figures of merit that are made available in all the products. Moreover, the product processors generate metadata, in line with industry standards, to facilitate the cataloguing, filtering and browsing of the product image collection.
In addition to the fully automatic processing chain, an advanced Manual Processing Chain User Interface is available, with the following main capabilities:
- Product Viewer
- Image Filtering Tools
- GCP Tool
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user4EO
User Services
user4EO is a multi-mission web-based service that, offering an advanced front-end, allows to:
- Assess the feasibility of new image acquisitions of a given Area of Interest (AoI)
- Send target-based image orders to one of the configured EO missions based on the feasibility analysis performed
- Request the coverage of a given extended AoI using individual target acquisition requests (Coverage Image Orders)
- Provide feedback on the request status throughout all different stages, from planned to acquired, processed and delivered, allowing the user to act on the request (update, cancel, etc)
- Monitor and control the execution process of Coverage Image Orders whose objective is to achieve the coverage of a given area
- Optionally, access to a local archive of image products, including the downlinked and processed image requests
Download Product Data Sheet
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archive4EO
Archive & Catalogue
archive4EO is a multi-mission module in charge of the archiving, storage and inventory functions of mission data and products. It is responsible for the permanent storage of all the data and products received from the satellite(s) for an extended period of time in the Archive. The Catalogue allows the other ground segment facilities to access to the mission metadata and products.
It gathers products interacting with other ground segment components and catalogues the products according to several useful metadata. It also stores the products physically, in order to be able to distribute them on demand. The archive provides an optimised storage structure, organised in hierarchical levels. Catalogue Web Services (CSW) protocols, following OGC standards, are provided to access the data.
Besides being in operations as part of gs4EO in the mission Deimos-2, archive4EO is used within Sentinel-1 and Sentinel-2 facilities and will be used in the Spanish Governmental Earth Observation missions. Additionally, it has been adapted for its utilisation in Space Science & Exploration missions, and will be used in ESA’s CHaracterising ExOPlanet Satellite mission CHEOPS.
