Symphonie


The Symphonie satellites were the first communications satellites built by France and Germany to provide geostationary orbit injection and station-keeping during their operational lifetime. After the launch of the second flight model, they comprised the first complete telecommunications satellite system. They were the result of a program of formal cooperation between France and Germany.

1963–1970: Beginnings

  • January 22, 1963: Signing by President Charles de Gaulle and Chancellor Konrad Adenauer of the Élysée Treaty, an agreement for Franco-German cooperation. Start of preliminary studies in France and in Germany of communications satellites.
  • June 1967: Both countries sign an intergovernmental convention concerning the launch and exploitation of an experimental telecommunication satellite and the development and construction of earth stations necessary for control of the satellites. Formation of a Franco-German board of directors and executive committee. The committee is headed by two executive secretaries – one German and the other French. Belgium joins the program.
  • 1967–1968: A Request for Proposals is launched for the Symphonie satellite, which was answered by two Franco-German consortia. The leaders are, respectively, Nord Aviation for the CIFAS consortium and Matra Space for the competing consortium. The CIFAS consortium was selected after the evaluation of bids and undertook, according to the terms of the consultation, a rounding-out of the various roles of the French and German firms in charge of electronic technology.
  • 1969: Beginning of a preliminary definition phase of the satellite, and negotiation of the contract and main subcontracts. Establishment of the industrial project team in Les Mureaux and the client-project group in Brétigny-sur-Orge. Production of mission specifications, satellite specifications and specifications for the control and exploitation segments.

    Industrial Organization

Within the bilateral French-German contract, and under industrial prime contractorship of the CIFAS consortium composed of six companies, their responsibilities were as follows:

Aérospatiale (France)

  • Consortium leader and host of the integrated project team at its centre at Les Mureaux.
  • Structures, and thermal-control subsystems and manufacture of all associated panels, mechanisms, thermal hardware and antenna reflectors.
  • Manufacture of the cold gas attitude control system, harness and pyrotechnics.
  • Integration of mechanical and thermal models.
  • Integration of the electrical identification model and the first flight model, Symphonie-A.

    Messerschmitt-Bölkow-Blohm (MBB) (Germany)

  • Attitude and Orbit Control Subsystem .
  • Manufacture of the hot-gas thruster system.
  • Apogee motor subsystem.
  • Mechanical ground-support equipment for integration and transport.
  • Contribution of electrical test sets.
  • Integration of the qualification prototype and the second flight model, Symphonie-B.

    Thomson-CSF (France)

  • Super high frequency -antenna subsystem for telecommunications payload and VHF-antenna subsystem for the TT&C.
  • Manufacture of the TT&C system.
  • Manufacture of equipment for telecommunications transponders, local oscillators and frequency conversion.
  • Electronic test system for ground testing.

    Siemens AG (Germany)

  • SHF C-band telecommunications transponder subsystem.
  • Manufacture of equipment for telecommunications transponders, receiving section and intermediary frequency amplification.
  • Contribution of electrical test set.

    SAT (France)

  • Solar-array subsystem.
  • Manufacture of telemetry encoder.
  • Contribution to electrical test sets.

    AEG-Telefunken (Germany)

  • Regulated electric power supply subsystem.
  • Manufacture of equipment for the telecommunications transponders, transmission section.
  • Manufacture of SHF modulators and demodulators for onboard telemetry and telecommand.
  • Contribution to electrical test sets.

    Other major contributions

  • The six CIFAS companies participated in the integrated project team with detached personnel, headed by Pierre Madon.
  • Belgium officially contributed to the project; its industrial presence included the Ateliers de Constructions Electriques de Charleroi and the space division of ETCA, supplier of the DC-DC converters for the electric power supply; and SAIT for the EGSE test computers.
  • French and German equipment manufacturers contributed under contract to the consortium members.
  • Major test facilities used for the qualification and acceptance tests : SOPEMEA and IABG in.
  • Calibration of telecommunications performance: Centre National d'Etudes des Telecommunications.

    1970: Satellite development

  • 1970–1971: Beginning of the Symphonie satellite development program, with a contract signed by General Robert Aubinière and Dr. Mayer Bundesministerium für Wissenschaft und Forschung. The CIFAS consortium went through several restructurings with the creation of Thomson-CSF, MBB, AEG Telefunken and Aérospatiale.
  • 1972: The failure of the Europa II launch vehicle and the abandonment of the program triggers a crisis; it is uncertain if development should continue or, if so, how the satellites will be deployed. After some governmental hesitation, the program continues. The satellites will be launched by the American Thor Delta 2914 satellite-launch vehicles, at the cost of a restrictive agreement; any commercial use of Symphonie is forbidden by the U.S. State Department.
  • 1973: Integration of the test and qualification models of the satellite.
  • 1974: Integration in Les Mureaux of the first flight model and delivery of the satellite.

    Launch and lifespan

  • 1974: Symphonie-A was successfully launched from the Kennedy Space Center on December 19, 1974, at 2:39 a.m. UT..
  • 1975: President Valéry Giscard d'Estaing of France and German Chancellor Helmut Schmidt exchange their New Year greetings live in a videoconference, via Symphonie-A in geostationary orbit. Symphonie-A is the first geostationary telecommunications satellite built and operated in Europe; some of its technology is groundbreaking.
  • 1975: After its integration at MBB in Ottobrunn and delivery, Symphonie-B is launched from the Kennedy Space Center on August 27, 1975, at 1:42 a.m. UT.
  • 1975: The two satellites are positioned in geostationary orbit at 11.5° west, perfectly fulfilling their mission ; they are the stars of the 1975 Geneva Telecom Show.
  • 1977–1979: For two years beginning in June 1977, Symphonie-A is repositioned over the Indian Ocean at 49° east, where it carries out experiments with India and China.
  • February 4–7, 1980: An international colloquium is held in Berlin concerning the technical and operational results of the program. Among the presentations, Professor Hubert Curien declared in brief, "Symphonie is the father of Ariane"; it served as the catalyst for the European decision to develop a heavy launch vehicle.
  • August 12, 1983: Symphonie-A makes its final manoeuvre to a graveyard orbit, and is de-activated after years of service.
  • December 19, 1984: Exactly ten years after the launch of Symphonie-A, Symphonie-B is also deactivated and placed in a graveyard orbit after nine years of active service. The Symphonie satellites operated successfully for double their expected lifespans, performing hundreds of experiments and expanding the horizons of telecommunications in space.

    Uses

Symphonie was the forerunner for numerous telecommunications services. Its prohibition on commercial use may have paradoxically induced a larger program for experimentation of space telecommunications than ever before – both in the number of participating countries and diversity of field applications. As an example of the extent of its use, 40 countries participated in links via Symphonie A and B – from Quebec to Argentina, from Finland to Reunion Island and from China to Indonesia. The Symphonie A and B experiments may be divided into two types:
To these types operational experiments may be added, notably for links between metropolitan France and its overseas departments for telephony and television via satellite. From this viewpoint Symphonie was a forerunner of the French national programs Telecom-1 & 2 and TDF 1 & 2, and the German programs TV-SAT and DFS Kopernikus. The wideband transponders, with their operational flexibility, made it possible to test all-access techniques and modulation: FDMA, TDMA and SSMA. Symphonie terrestrial stations with antennas of various diameters from 16 to 2.2 meters contributed to the renown of the programme around the world. + Several demonstrations were:
One opportunity to demonstrate Symphonie's utility in 1978 was not used; it could have been utilized in Kolwezi, if the French chiefs of staff had followed the above-mentioned UN example rather than calling upon logistical support from the United States.