Myriade is a

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

miniaturized satellite A small satellite, miniaturized satellite, or smallsat is a satellite of low mass and size, usually under . While all such satellites can be referred to as "small", different classifications are used to categorize them based on mass. Satellites c ...

platform Platform may refer to: Arts * Platform, an arts centre at The Bridge, Easterhouse, Glasgow * ''Platform'' (1993 film), a 1993 Bollywood action film * ''Platform'' (2000 film), a 2000 film by Jia Zhangke * '' The Platform'' (2019 film) * Pla ...

developed by

EADS Astrium Astrium was a European aerospace company and subsidiary of the European Aeronautic Defence and Space Company (EADS), headquartered in Paris. It designed, developed and manufactured civil and military space systems and provided related services ...

and

CNES CNES () is the French national space agency. Headquartered in central Paris, the agency is overseen by the ministries of the Armed Forces, Economy and Finance and Higher Education, Research and Innovation. It operates from the Toulouse Spac ...

. EADS Astrium offers the Myriade bus under the commercial name Astrosat-100. CNES began developing Myriade in 1998, as a continuation of the

Proteus In Greek mythology, Proteus ( ; ) is an early prophetic sea god or god of rivers and oceanic bodies of water, one of several deities whom Homer calls the "Old Man of the Sea" (''hálios gérôn''). Some who ascribe a specific domain to Prote ...

program.

Description

Myriade satellites are cube-shaped, measuring 60 cm along one side, and weigh between 100 and 200 kg. The control system is a

Transputer The transputer is a series of pioneering microprocessors from the 1980s, intended for parallel computing. To support this, each transputer had its own integrated memory and serial communication links to exchange data with other transputers. ...

T805 with 1 Gigabit of memory and capable of 5 MIPS. It is interfaced via

i2c I, or i, is the ninth letter and the third vowel letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''i'' (pronounced ), plu ...

FPGA A field-programmable gate array (FPGA) is a type of configurable integrated circuit that can be repeatedly programmed after manufacturing. FPGAs are a subset of logic devices referred to as programmable logic devices (PLDs). They consist of a ...

and

PIC microcontroller PIC (usually pronounced as /pɪk/) is a family of microcontrollers made by Microchip Technology, derived from the PIC1640 originally developed by General Instrument's Microelectronics Division. The name PIC initially referred to ''Peripher ...

s that control onboard equipment. Power is provided by one steerable

gallium arsenide Gallium arsenide (GaAs) is a III-V direct band gap semiconductor with a Zincblende (crystal structure), zinc blende crystal structure. Gallium arsenide is used in the manufacture of devices such as microwave frequency integrated circuits, monoli ...

solar array A photovoltaic system, also called a PV system or solar power system, is an electric power system designed to supply usable solar power by means of photovoltaics. It consists of an arrangement of several components, including solar panels to abs ...

. Communication is by two

S band The S band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a part of the microwave band of the electromagnetic spectrum covering frequencies from 2 to 4 gigahertz (GHz). Thus it crosses the conventiona ...

transceiver In radio communication, a transceiver is an electronic device which is a combination of a radio ''trans''mitter and a re''ceiver'', hence the name. It can both transmit and receive radio waves using an antenna, for communication purposes. The ...

s, offering downlink rates of up to 400 kbit/s, and an optional

X band The X band is the designation for a band of frequencies in the microwave radio region of the electromagnetic spectrum. In some cases, such as in communication engineering, the frequency range of the X band is set at approximately 7.0–11.2&nbs ...

system with downlink rates of 18-72 Mbit/s.

Launched Myriade satellites

The first Myriade based system was

Demeter In ancient Greek religion and Greek mythology, mythology, Demeter (; Attic Greek, Attic: ''Dēmḗtēr'' ; Doric Greek, Doric: ''Dāmā́tēr'') is the Twelve Olympians, Olympian goddess of the harvest and agriculture, presiding over cro ...

(Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions), launched in June 2004. Since then, missions have included: *

PARASOL An umbrella or parasol is a folding canopy (building), canopy supported by wooden or metal ribs that is mounted on a wooden, metal, or plastic pole. It is usually designed to protect a person against rain. The term ''umbrella'' is traditionall ...

, a French-built Earth observing research satellite - launched in December 2004. * Essaim, a

French French may refer to: * Something of, from, or related to France ** French language, which originated in France ** French people, a nation and ethnic group ** French cuisine, cooking traditions and practices Arts and media * The French (band), ...

military reconnaissance microsatellite

constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The first constellati ...

- launched in December 2004. * Spirale, a demonstrator system which includes two 120 kilograms (260 lb) microsatellites - launched in February 2009. *

Picard Picard may refer to: Places * Picard, Quebec, Canada * Picard, California, United States * Picard (crater), a lunar impact crater in Mare Crisium People and fictional characters * Picard (name), a list of people and fictional characters with th ...

, dedicated to the simultaneous measurement of the absolute total and spectral

solar irradiance Solar irradiance is the power per unit area (surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Solar irradiance is measured in watts per square metre ( ...

, the diameter and solar shape, and to probing the Sun's interior - launched in June 2010. *

ELISA The enzyme-linked immunosorbent assay (ELISA) (, ) is a commonly used analytical biochemistry assay, first described by Eva Engvall and Peter Perlmann in 1971. The assay is a solid-phase type of enzyme immunoassay (EIA) to detect the presence of ...

: ELISA 1, ELISA 2, ELISA 3 and ELISA 4 are a suite of French military satellites - launched on December 17, 2011. *

MICROSCOPE A microscope () is a laboratory equipment, laboratory instrument used to examine objects that are too small to be seen by the naked eye. Microscopy is the science of investigating small objects and structures using a microscope. Microscopic ...

, ministallite designed to test the

weak equivalence principle The equivalence principle is the hypothesis that the observed equivalence of gravitational and inertial mass is a consequence of nature. The weak form, known for centuries, relates to masses of any composition in free fall taking the same tr ...

to two orders of magnitude better than can be achieved by ground-based experiments. Launched in 25 April 2016. *

TARANIS Taranis (sometimes Taranus or Tanarus) is a Celtic thunder god attested in literary and epigraphic sources. The Roman poet Lucan's epic ''Pharsalia'' mentions Taranis, Esus, and Teutates as gods to whom the Gauls sacrificed humans. This rare ...

, launched in November 2020 but experienced launch failure (due to rocket) and did not achieve orbit.

Prospective missions

References

eoPortal directory: Myriade (CNES Microsatellite Program)
* {{reflist , refs= {{cite web , url=http://smsc.cnes.fr/MICROSCOPE/index.htm , title=MICRO-Satellite a traînee Compensee pour l'Observation du Principe d'Equivalence , publisher=

External links

The MYRIADE micro-satellite series - CNES
Satellite buses CNES