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Basic information on our satellites
Information about satellites being operated by ISSL is shown here.
For more precise information, please refer to the website of each project.


Satellite Name Launch
XI-IV [sai-four] June 30, 2003
Plesetsk Cosmodrome, Russia
XI-V [sai-five] October 27, 2005
Plesetsk Cosmodrome, Russia
PRISM FY2008
Tanegashima Space Center, Japan


XI-IV

[1] General Information
Development started in 2000, and the flight model was completed in 2002. This XI-IV is the first handmade nano-satellite developed by ISSL. XI-IV is the world smallest satellite as of the launch date, which satisfies the CubeSat regulation of "10cm cube and 1kg". In addition, XI-IV is just 100th satellite put into orbit by Japan.
[2] Launch Information
XI-IV was launched on June 30, 2003, from Plesetsk Cosmodrome, Russia. The launching vehicle is named "ROCKOT", converted from the ballistic missile. This time we made a contract directly with Eurockot, which is the joint venture of Germany and Russia.
[3] Communication System Information
XI-IV is an amateur satellite using amateru band. The following information would be required to receive data from XI-IV.
Call Sign JQ1YCW
Downlink (Telemetry) Frequency : 437.490MHz
Last stage output power : 800mW
Antenna : Half-wave dipole
Modulation type : AFSK 1200bps
Protocol : AX.25
Downlink (Beacon) Frequency : 436.8475MHz
Last stage output power : 80mW
Antenna : Half-wave dipole
Modulation type : CW
Protocol : Morse code (Approximately 50WPM)
Attention! Telemetry downlink will be performed only when XI-IV is passing above Japan. We are sorry that any ham operators but those in East Asia cannot receive FM packet from XI-IV.
[4] Data Analysis Information
Applications for analyzing data received from XI-IV are now available. When you heard XI-IV, please send a report to us. We offer you a verification card.

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[5] Project Website
http://www.space.t.u-tokyo.ac.jp/cubesat/

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XI-V

[1] General Information
Originally XI-V is a backup model of XI-IV, and there has been no plan to launch it. However XI-IV was so successful, and a propose has come to verify the new type of solar cells with XI-V. Launch of XI-V was determined on very short notice. Receiving this chance, we improved the on-board software, and the images taken by XI-V will become more vivid and beautiful. Though XI-V is a kid brother of XI-IV, it can be said that he is a souped-up young.
[2] Launch Information
XI-V was launched on October 27, 2005, from Plesetsk Cosmodrome, Russia. The launching vehicle was "KOSMOS" rocket. XI-V was released from ESA's educational satellite SSETI-Express. SSETI-Express itself is a piggy-back satellite, which means that XI-V is a grandchild satellite.
[3] Communication System Information
The specification of XI-V communication system is almost the same as XI-IV. Note that the call sign and frequencies of XI-V are different.
Call Sign JQ1YGW
Downlink (Telemetry) Frequency : 437.345MHz
Last stage output power : 800mW
Antenna : Half-wave dipole
Modulation type : AFSK 1200bps
Protocol : AX.25
Downlink (Beacon) Frequency : 437.465MHz
Last stage output power : 80mW
Antenna : Half-wave dipole
Modulation type : CW
Protocol : Morse code (Approximately 50WPM)
[4] Data Analysis Information
Applications for analyzing data received from XI-V are now available. When you heard XI-V, please send a report to us. We offer you a verification card.

To download page

[5] Project Website
http://www.space.t.u-tokyo.ac.jp/cubesat/

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PRISM

[1] General Information
PRISM is a remote sensing satellite in which ISSL is engaged as the next-generation nano-satellite. We will install a full-fledged mission at the first time, and the bus functions are also upgraded. We try high level technology which no nano-satellites has never realized before. Active attitude control, on-orbit deployment mechanism, high resolution image acquisition are their examples.
[2] Launch Information
PRISM will be launched from TNSC on 1/21/2009.
[3] Specification of downlink lines
Call Sign JQ1YZW
Downlink (AFSK1200bps) Frequency : 437.425MHz
Last stage output power : 800mW
Antenna : Half-wave dipole
Modulation type : AFSK 1200bps
Protocol : AX.25
Downlink (GMSK1200bps) Frequency : 437.425MHz
Last stage output power : 2W
Antenna : Turnstyle
Modulation type : GMSK 9600bps
Protocol : AX.25
Downlink (Beacon) Frequency : 437.250MHz
Last stage output power : 80mW
Antenna : Half-wave dipole
Modulation type : CW
Protocol : Morse code
[4] Data Analysis Information
Some of applications for analyzing data received from PRISM are now available. When you heard PRISM, please send a report to GSN site or directly to ISSL operation team.

To download page

[5] Project Website
http://www.space.t.u-tokyo.ac.jp/prism/

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