BILSAT-1 (formerly just ''BILSAT'') was an

earth observation satellite An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation (EO) from orbit, including spy satellites and similar ones intended for non-military uses such as environmental monitoring, me ...

designed and developed by TÜBİTAK Space Technologies Research Institute (TÜBİTAK UZAY) and produced in

Turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a transcontinental country located mainly on the Anatolian Peninsula in Western Asia, with a small portion on the Balkan Peninsula in ...

as part of the

Disaster Monitoring Constellation The Disaster Monitoring Constellation for International Imaging (DMCii) or just Disaster Monitoring Constellation (DMC) consists of a number of remote sensing satellites constructed by Surrey Satellite Technology Ltd (SSTL) and operated for the A ...

(DMC) project in the context of a show-how program led by

DMC International Imaging DMC International Imaging (DMCii) is the company that manages the Disaster Monitoring Constellation for the International Charter for Space and Major Disasters. It also sells satellite imaging services under contract and manages the operations of s ...

Surrey Satellite Technology Surrey Satellite Technology Ltd, or SSTL, is a company involved in the manufacture and operation of small satellites. A spin-off company of the University of Surrey, it is presently wholly owned by Airbus Defence and Space. The company began ou ...

(SSTL).

Launch

BILSAT-1 was launched from Plesetsk Cosmodrome Site 132/1,

Arkhangelsk Oblast Arkhangelsk Oblast (russian: Арха́нгельская о́бласть, ''Arkhangelskaya oblast'') is a federal subject of Russia (an oblast). It includes the Arctic archipelagos of Franz Josef Land and Novaya Zemlya, as well as the Solov ...

Russia Russia (, , ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, with its internationally recognised territory covering , and encompassing one-eight ...

by a

Kosmos-3M The Kosmos-3M (russian: Космос-3М meaning "''Cosmos''", GRAU index 11K65M) was a Russian space launch vehicle, member of the Kosmos rocket family. It was a liquid-fueled two-stage launch vehicle, first launched in 1967 and with over 420 ...

space launch vehicle on September 27, 2003 at 06:12 UTC in a multiple-satellite payload launch along with six other satellites, namely Mozhayets-4 and Larets of Russia, NigeriaSat of

Nigeria Nigeria ( ), , ig, Naìjíríyà, yo, Nàìjíríà, pcm, Naijá , ff, Naajeeriya, kcg, Naijeriya officially the Federal Republic of Nigeria, is a country in West Africa. It is situated between the Sahel to the north and the Gulf of G ...

, UK-DMC from the United Kingdom,

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korean Peninsula and sharing a land border with North Korea. Its western border is formed by the Yellow Sea, while its ea ...

STSAT-1 The STSat-1 (Science and Technology Satellite-1), formerly known as KAISTSat-4 (Korea Advanced Institute of Science and Technology Satellite-4), is an ultraviolet telescope in a satellite. It is funded by the Korea Aerospace Research Institut ...

and Germany's Rubin 4-DS. It was placed in a polar, circular, sun-synchronous

geocentric orbit A geocentric orbit or Earth orbit involves any object orbiting Earth, such as the Moon or artificial satellites. In 1997, NASA estimated there were approximately 2,465 artificial satellite payloads orbiting Earth and 6,216 pieces of space debri ...

at an altitude of with orbital parameters as

period Period may refer to: Common uses * Era, a length or span of time * Full stop (or period), a punctuation mark Arts, entertainment, and media * Period (music), a concept in musical composition * Periodic sentence (or rhetorical period), a concept ...

98.5 min, apogee , perigee and

inclination Orbital inclination measures the tilt of an object's orbit around a celestial body. It is expressed as the angle between a reference plane and the orbital plane or axis of direction of the orbiting object. For a satellite orbiting the Earth ...

98.2°.

Mission

One of the four spacecraft of the DMC project, which is an organization for international space program cooperation formed by seven countries, namely United Kingdom,

Algeria ) , image_map = Algeria (centered orthographic projection).svg , map_caption = , image_map2 = , capital = Algiers , coordinates = , largest_city = capital , relig ...

, China, Nigeria,

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is b ...

Vietnam Vietnam or Viet Nam ( vi, Việt Nam, ), officially the Socialist Republic of Vietnam,., group="n" is a country in Southeast Asia, at the eastern edge of mainland Southeast Asia, with an area of and population of 96 million, making it ...

and Turkey, BILSAT-1 was dedicated to studies on agriculture, forestry, hydrology, land cover/use and mapping, environment as well as urban area development. It was built at a cost of $14 million. The first images were from Cape Town,

South Africa South Africa, officially the Republic of South Africa (RSA), is the Southern Africa, southernmost country in Africa. It is bounded to the south by of coastline that stretch along the Atlantic Ocean, South Atlantic and Indian Oceans; to the ...

taken on October 18,

Gulf of İskenderun The Gulf of Alexandretta or İskenderun ( tr, İskenderun Körfezi) is a gulf of the eastern Mediterranean or Levantine Sea. It lies beside the southern Turkish provinces of Adana and Hatay. Names The gulf is named for the nearby Turkish city ...

, Turkey taken on October 30 and

Kuwait City Kuwait City ( ar, مدينة الكويت) is the capital and largest city of Kuwait. Located at the heart of the country on the south shore of Kuwait Bay on the Persian Gulf, it is the political, cultural and economical centre of the emirat ...

taken on November 6, 2003. BILSAT-1 ended its mission in August 2006 due to battery cells failure.

Payloads

Turkey's first indigenously developed scientific

microsatellite A microsatellite is a tract of repetitive DNA in which certain DNA motifs (ranging in length from one to six or more base pairs) are repeated, typically 5–50 times. Microsatellites occur at thousands of locations within an organism's genome. ...

for

remote sensing Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation. The term is applied especially to acquiring information about Earth ...

, BILSAT-1 was based on an enhanced SSTL-100

satellite bus A satellite bus (or spacecraft bus) is the main body and structural component of a satellite or spacecraft, in which the payload and all scientific instruments are held. Bus-derived satellites are opposed to specially produced satellites. Bus-d ...

. The satellite features a multi-spectral instrument called ÇOBAN, which is a low-resolution 8-channel camera. The name is an abbreviation for "ÇOk-BANtlı Kamera" for "Multi-Band Camera". It has two imaging sensors, a 4-band visible and near-infrared (VNIR) sensor at a resolution of and a high-resolution panchromatic sensor at . The

swath width A swathe (; rhymes with "bathe") or swath (; rhymes with "cloth") is the width of a scythe stroke or a mowing-machine blade, the path of this width made in mowing or the mown grass or grain lying on such a path. The mower with a scythe moves alon ...

s were for the VNIR and for the panchromatic sensor. The sensors had a 4-day repeat cycle. BILSAT-1 hosted a real time image compression module named GEZGIN, an abbreviation for "GErçek Zamanda Görüntü İşleyeN", which is a

digital signal processor A digital signal processor (DSP) is a specialized microprocessor chip, with its architecture optimized for the operational needs of digital signal processing. DSPs are fabricated on MOS integrated circuit chips. They are widely used in audio sig ...

using

JPEG 2000 JPEG 2000 (JP2) is an image compression standard and coding system. It was developed from 1997 to 2000 by a Joint Photographic Experts Group committee chaired by Touradj Ebrahimi (later the JPEG president), with the intention of superseding thei ...

algorithm to compress images taken by the satellite. Further payloads are on board propulsion,

GPS navigation device A satellite navigation device (satnav device) is a user equipment that uses one or more of several global navigation satellite systems (GNSS) to calculate the device's geographical position and provide navigational advice. Depending on the s ...

, a GPS attitude receiver and a

control moment gyroscope A control moment gyroscope (CMG) is an attitude control device generally used in spacecraft attitude control systems. A CMG consists of a spinning rotor and one or more motorized gimbals that tilt the rotor’s angular momentum. As the rotor tilts ...

. BILSAT-1 also hosted new technologies such as high-capacity solid-state data recorders and

star tracker A star tracker is an optical device that measures the positions of stars using photocells or a camera. As the positions of many stars have been measured by astronomers to a high degree of accuracy, a star tracker on a satellite or spacecraft may ...

References

{{Turkey space program Earth observation satellites of Turkey Spacecraft launched in 2003 Derelict satellites orbiting Earth Scientific and Technological Research Council of Turkey