LituanicaSAT-1 was one of the first two Lithuanian satellites (other one being LitSat-1). It was launched along with the second Cygnus spacecraft and 28 Flock-1CubeSats aboard an Antares 120 carrier rocket flying from Pad 0B at the Mid-Atlantic Regional Spaceport on Wallops Island to the International Space Station.[1] The launch was scheduled to occur in December 2013, but later was rescheduled to 9 January 2014 and occurred then. The satellite was broadcasting greetings of Lithuanian president, Mrs. Dalia Grybauskaitė. The satellite was deployed from the International Space Station via the NanoRacksCubeSat Deployer on February 28, 2014.[2][3] All LituanicaSAT-1 subsystems have been turned on, tested and proved to be working properly. The mission is considered a complete success by its team of engineers.[4][5] The mission ended upon the reentry and disintegration of the satellite on July 28, 2014.
The satellite conforms to standard 1U size cubesat form factor as to the latest cubesat design specifications. The satellite does not have any active systems except the antenna deployment mechanism that is engaged 30 minutes after deployment sequence. Both attitude and thermal control sub-systems are implemented passively for simplicity and safety. The total mass of the body including the equipment within it is 1,090 g.
Subsystemsedit
Attitude determination and controledit
LituanicaSAT-1 uses passive magnetic attitude control system consisting of permanent magnets that create a control torque and soft magnets that provide dampening torque using hysteresis effect. Following attitude sensors are implemented for attitude determination:
There are two on board computers in LituanicaSAT-1 due to redundancy requirements: the flight computer based on ARM Cortex-M4F microcontroller and secondary (back-up) computer based on an Atmel ATMega2560 microcontroller. The flight computer is the central control unit of the satellite responsible for maintaining the normal operating mode of the satellite, monitoring and control of energy resources, control of attitude determination sub-system and performance of telecommands received from the satellite ground station in Vilnius University, Lithuania. Secondary flight computer is based on Arduino. It ensures limited but safe functionality of the satellite in case of the main CPU failure and will also take and record the first pictures made from space, as well as control the radio beacon of the satellite.
Payloadedit
The main payload is amateur radio FM mode V/U voice repeater. It operates on 145.950 MHz uplink (PL 67 Hz CTCSS) and 435.180 MHz downlink. The FM repeater subsystem identifies itself with callsign LY5N. The first filter of repeaters receiver is 15 kHz wide, second is 12 kHz. The transmit filter is set to +/- 5 kHz, and bandwidth to 10 kHz, but this width depends highly on the incoming signal width, for example if the uplink signal is 15 kHz wide, it will be cut down with 12 kHz filter. The repeater payload was engineered and developed by Žilvinas Atkočiūnas and Žilvinas Batisa.[6] Due to temperature changes, the downlink frequency may be shifted down by 5 kHz.[7]
Power supply subsystemedit
The power supply sub-system includes a GomSpace Nanopower P31u power board with a lithium-ion battery and solar cells.[8]
Communications subsystemedit
Comm subsystem consists of AX.25 transceiver and corresponding antennas. He-100 COTS transceiver is used for establishing and maintaining radio communication with the ground station. The key technical specifications of the radio transceiver are as follows:
Operating frequencies: TX: 437 MHz / RX: 144 MHz
Sensitivity: -104.7 dBm @ BER 10-3
Transmit power: 100 mW – 2 W
Receive power: < 200 mW
Data transfer rate: 9600 bit/s
Data protocol: AX.25
Operating temperature: from -30 to +70 °C
Antennasedit
There are 4 monopole antennas on LS-1: three UHF antennas and one VHF antenna. Each antenna is made of approx. 0.2 mm thick and 5 mm wide spring steel measurement tape. In deployed configuration, all UHF antennas are pointed towards the Z+ body axis direction and VHF antenna is pointed toward –Z body axis.
Mission controledit
The satellite is commanded from Vilnius Universityamateur radio station, LY1BWB.[9] Ground control software is written in Erlang and has a web interface, served by Yaws. The source code of the software is partly available for public use.[10] Communication is done using custom protocol, which is built on top of reduced set of AX.25 and handles full-duplex data transfer, when required. Recent versions of ground control software support direct upload of binary telemetry files, which were collected and sent to ground control by amateur radio operators worldwide.[11]
OSCAR statusedit
On June 8, 2014, AMSAT-NAOSCAR number administrator Bill Tynan, W3XO, stated that "LituanicaSAT-1 has met all of the requirements for an OSCAR number" and assigned the designation of LO-78 (LituanicaSAT-OSCAR 78) to the satellite.[12] The team of engineers subsequently announced that it will try to keep the onboard FM repeater operative for the rest of the mission.[13]
Referencesedit
^Rainey, Kristine (22 July 2015). "It's a March of the CubeSats as Space Station Deployment Continues".
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LituanicaSAT 1 was one of the first two Lithuanian satellites other one being LitSat 1 It was launched along with the second Cygnus spacecraft and 28 Flock 1 CubeSats aboard an Antares 120 carrier rocket flying from Pad 0B at the Mid Atlantic Regional Spaceport on Wallops Island to the International Space Station 1 The launch was scheduled to occur in December 2013 but later was rescheduled to 9 January 2014 and occurred then The satellite was broadcasting greetings of Lithuanian president Mrs Dalia Grybauskaite The satellite was deployed from the International Space Station via the NanoRacks CubeSat Deployer on February 28 2014 2 3 All LituanicaSAT 1 subsystems have been turned on tested and proved to be working properly The mission is considered a complete success by its team of engineers 4 5 The mission ended upon the reentry and disintegration of the satellite on July 28 2014 Lituanica SAT 1OperatorVilnius University Innovative Engineering Projects NPOCOSPAR ID1998 067ENSATCAT no 39569Websitewww wbr astronauts wbr ltMission duration5 months deployed 6 months 19 days in space planned mission 6 months Spacecraft propertiesManufacturerInnovative Engineering Projects NPODry mass1090 g Start of missionLaunch date9 January 2014 18 07 2014 01 09UTC18 07Z UTCRocketAntares 120Launch siteMARS LP 0AContractorOrbital SciencesDeployed fromISSDeployment date28 February 2014 2014 02 28 End of missionDecay date28 July 2014Orbital parametersReference systemGeocentricRegimeLow Earth Contents 1 Description 2 Subsystems 2 1 Attitude determination and control 2 2 Command and data management 2 3 Payload 2 4 Power supply subsystem 2 5 Communications subsystem 2 6 Antennas 3 Mission control 4 OSCAR status 5 References 6 External linksDescription editThe satellite conforms to standard 1U size cubesat form factor as to the latest cubesat design specifications The satellite does not have any active systems except the antenna deployment mechanism that is engaged 30 minutes after deployment sequence Both attitude and thermal control sub systems are implemented passively for simplicity and safety The total mass of the body including the equipment within it is 1 090 g Subsystems editAttitude determination and control edit LituanicaSAT 1 uses passive magnetic attitude control system consisting of permanent magnets that create a control torque and soft magnets that provide dampening torque using hysteresis effect Following attitude sensors are implemented for attitude determination PS MPU 6000A MEMS motion sensor PS MPU 9150A MEMS motion sensor L3GD20 MEMS three axis digital output gyroscope HMC5883L three axis digital magnetometer Command and data management edit There are two on board computers in LituanicaSAT 1 due to redundancy requirements the flight computer based on ARM Cortex M4F microcontroller and secondary back up computer based on an Atmel ATMega2560 microcontroller The flight computer is the central control unit of the satellite responsible for maintaining the normal operating mode of the satellite monitoring and control of energy resources control of attitude determination sub system and performance of telecommands received from the satellite ground station in Vilnius University Lithuania Secondary flight computer is based on Arduino It ensures limited but safe functionality of the satellite in case of the main CPU failure and will also take and record the first pictures made from space as well as control the radio beacon of the satellite Payload edit The main payload is amateur radio FM mode V U voice repeater It operates on 145 950 MHz uplink PL 67 Hz CTCSS and 435 180 MHz downlink The FM repeater subsystem identifies itself with callsign LY5N The first filter of repeaters receiver is 15 kHz wide second is 12 kHz The transmit filter is set to 5 kHz and bandwidth to 10 kHz but this width depends highly on the incoming signal width for example if the uplink signal is 15 kHz wide it will be cut down with 12 kHz filter The repeater payload was engineered and developed by Zilvinas Atkociunas and Zilvinas Batisa 6 Due to temperature changes the downlink frequency may be shifted down by 5 kHz 7 Power supply subsystem edit The power supply sub system includes a GomSpace Nanopower P31u power board with a lithium ion battery and solar cells 8 Communications subsystem edit Comm subsystem consists of AX 25 transceiver and corresponding antennas He 100 COTS transceiver is used for establishing and maintaining radio communication with the ground station The key technical specifications of the radio transceiver are as follows Operating frequencies TX 437 MHz RX 144 MHz Sensitivity 104 7 dBm BER 10 3 Transmit power 100 mW 2 W Receive power lt 200 mW Data transfer rate 9600 bit s Data protocol AX 25 Operating temperature from 30 to 70 C Antennas edit There are 4 monopole antennas on LS 1 three UHF antennas and one VHF antenna Each antenna is made of approx 0 2 mm thick and 5 mm wide spring steel measurement tape In deployed configuration all UHF antennas are pointed towards the Z body axis direction and VHF antenna is pointed toward Z body axis Mission control editThe satellite is commanded from Vilnius University amateur radio station LY1BWB 9 Ground control software is written in Erlang and has a web interface served by Yaws The source code of the software is partly available for public use 10 Communication is done using custom protocol which is built on top of reduced set of AX 25 and handles full duplex data transfer when required Recent versions of ground control software support direct upload of binary telemetry files which were collected and sent to ground control by amateur radio operators worldwide 11 OSCAR status editOn June 8 2014 AMSAT NA OSCAR number administrator Bill Tynan W3XO stated that LituanicaSAT 1 has met all of the requirements for an OSCAR number and assigned the designation of LO 78 LituanicaSAT OSCAR 78 to the satellite 12 The team of engineers subsequently announced that it will try to keep the onboard FM repeater operative for the rest of the mission 13 References edit Rainey Kristine 22 July 2015 It s a March of the CubeSats as Space Station Deployment Continues NASA NanoRacks LituanicaSAT 1 www nasa gov LituanicaSAT 1 CubeSat Update 14 March 2014 LituanicaSat 1 AMSAT UK amsat uk org LituanicaSat transponder test was a full success DK3WN SatBlog 5 August 2023 LituanicaSat 1 repeater rev 2 LY3H ly3h epalete com LituanicaSat DK3WN SatBlog www dk3wn info 5 August 2023 Satellite Description LituanicaSAT 1 Archived from the original on 4 July 2014 Retrieved 11 June 2014 VU radijo klubas LY1BWB kolektyvinio radijo megeju tobulejimo tinklarastis www rk projektas vu lt Petrauskas Karolis 29 August 2014 ls1mcs LituanicaSat 1 MCS via GitHub Data submission LituanicaSAT 1 Archived from the original on 30 May 2014 Retrieved 9 June 2014 OSCAR Number for LituanicaSAT 1 AMSAT NA Amsat org 28 June 2017 LituanicaSAT 1 FM Transponder Active Amsat uk org 6 June 2014 External links edit nbsp Spaceflight portal Project web page LituanicaSAT 1 YouTube channel A three dimensional view of the satellite in Lithuanian Retrieved from https en wikipedia org w index php title LituanicaSAT 1 amp oldid 1169195646, wikipedia, wiki, book, books, library,
