Proba V

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Proba-V
Type: Earth observation satellite
Operator: European space agencyESA ESA
COSPAR-ID : 2013-021A
Mission dates
Dimensions: 138.2 kg
Size: 1 m³
Begin: May 7, 2013
Starting place: CSG , ELV
Launcher: Vega
Flight duration: 2.5 + 2.5 years
Status: active
Orbit data
Rotation time : 101.2 minutes
Orbit inclination : 98.6 °
Apogee height 824.9 km
Perigee height 820.4 km

Proba-V is an ESA Earth observation satellite . It works in a sun-synchronous earth orbit, with an orbit plane close to the polar regions. It is formally the fourth satellite (the V stands for vegetation) of the Proba series ("Project for On-Board Autonomy"). However, it is third in the starting order, as Proba-3 is not due to start until the end of 2020. ESA's Proba range is not limited to Earth observation.

Mission objectives

Vegetation map of Germany, created from data from Proba-V

The mission goal of Proba-V is to measure and map the vegetation on earth . In order to follow the development of the vegetation up-to-date, Proba-V records the entire planet completely every two days. The data is made available to scientists and governmental and non-governmental organizations worldwide. The information is intended to keep the responsible authorities informed about crop failures , the expansion of deserts and deforestation .

Proba-V can be seen as a supplement to the SPOT program and continues the tasks of the French satellite Spot-4 (mission: March 1998 to January 2013). Proba-V flies in the same orbit as Spot-5 (mission: since May 2002) and was supposed to replace it in 2014. However, in 2016 Spot-5 is still active. The more sophisticated Proba-V enables the data from the French satellite to be checked and supplemented with a much faster orbit and an enormous swath width of 2,250 km.

construction

Proba-V has three cameras, which are aligned differently and can be activated / deactivated individually. The orientation angle of the two outer to the middle camera is 34 °. The different alignment of the cameras makes it possible to view the observation target from different angles and with a minimal time difference. The cameras each have a VNIR sensor (visible and near infrared spectrum ) and an SWIR sensor (short-wave infrared spectrum). The VNIR sensors use three detectors (for blue, red light and the near infrared spectrum). The SWIR sensors only use one detector for the short-wave infrared spectrum. The detectors have a slightly different orientation along the viewing angle.

Proba-V has five additional payloads:

  • X-band - transmitter based on the GaN RF - amplifier technology
  • a compact and modular spectrometer EPT ("Energetic Particle Telescope") for radiation monitoring
  • In addition to the EPT, a SATRAM chip ("Space Application of Timepix-based Radiation Monitor")
  • ADS-B receiver for demonstrating air traffic control by LEO satellites
  • Glass fiber photon experiment (HERMOD) to test multi-fiber optical fiber optic cables and connections

The EPT analyzes the charge, energy and the angle of incident radiation particles. The SATRAM chip developed for CERN uses a 0.06 megapixel sensor to process the radiation dynamically and with high sensitivity, including to visualize the previous particle trajectory.

The ADS-B demonstration recorded 25 million positions from 15,000 individual aircraft between 2013 and 2015. This research project is operated by the DLR and has a location area of ​​around 1,500 × 750 km. A large number of satellites would be required for permanent and global acquisition of ADS-B data via LEO satellites, which would be of interest for regions with non-area-wide air traffic control (e.g. outside of industrialized countries ). Such a system is operated by Iridium NEXT . However, the ESA would like to evaluate the need for a European solution.

Proba-V has a 160 GBit data memory. Control and monitoring data are transferred via S-band, the "payload data" are transferred via X-band.

Follow-up missions

ESA's Proba series will continue with Proba-3 . However, this has nothing to do with the mission of Proba-V, but will demonstrate the formation flight of large-scale (orbital) experiments.

ESA's SPOT program will continue. Spot-6 was launched on September 9, 2012 and Spot-7 on June 30, 2014. However, these earth observation satellites are not focused on the analysis of the earth's vegetation.

Web links

Commons : Proba-V  - collection of images, videos and audio files

Individual evidence

  1. a b c d e N2YO Proba-V. N2YO.com, March 13, 2016, accessed March 13, 2016 .
  2. ESA'S Vega launcher scores new success with Proba-V. ESA, May 7, 2013, accessed March 13, 2016 .
  3. a b c d e f ESA Earth Online Proba-V. ESA, May 30, 2013, accessed March 13, 2016 .
  4. About Proba-V. ESA, May 30, 2013, accessed March 13, 2016 .
  5. a b About Proba-3. ESA, July 17, 2017, accessed January 7, 2019 .
  6. a b Proba-V opens its eyes. ESA, May 17, 2013, accessed March 13, 2016 .
  7. a b ESA Earth Online SPOT. ESA, September 4, 2015, accessed March 13, 2016 .
  8. ^ Gio Global Land Component - Lot I “Operation of the Global Land Component”. (No longer available online.) VITO - Flemish Institute for Technological Research NV - Bruno Smets, Else Swinnen, Wouter Dierckx, Pieter Kempeneers, Roxane van der Goten, September 1, 2014, archived from the original on September 8, 2015 ; accessed on March 13, 2016 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / land.copernicus.eu
  9. ESA Earth Online SPOT. Royal Belgian Institute for Space Aeronomy, November 12, 2015, accessed March 13, 2016 .
  10. a b c Proba-V carrying radiation detector from CERN to space. ESA, April 22, 2013, accessed March 13, 2016 .
  11. Satellite's fiber diet: Proba-V hosting fiber optics test. ESA, March 26, 2013, accessed March 13, 2016 .
  12. ^ Proba-V maps world air traffic from space. ESA, May 7, 2015, accessed March 20, 2016 .