DSLWP amateur radio satellites launched to Lunar orbit

Hu Chaoran BG2CRY tests 435/2250 MHz dish feed for DSLWP ground station - Image credit Wei Mingchuan BG2BHC

Hu Chaoran BG2CRY tests 435/2250 MHz dish feed for DSLWP ground station – Image credit Wei Mingchuan BG2BHC

DSLWP is a lunar formation flying mission led by Harbin Institute of Technology for low frequency radio astronomy, amateur radio and education. It consists of a pair of 47 kg microsatellites launched from the Xichang Space Center into a lunar transfer orbit at 21:28 GMT on Sunday, May 20, 2018 and they will enter a 300 x 9000km lunar elliptical orbit. Onboard each satellite, there are two VHF/UHF SDR transceivers to provide beacon, telemetry, telecommand, digital image downlink and a GMSK-JT4 repeater. Onboard transmitting power is about 2 watts.

Update May 21, 2018: After deployment signals from the DSLWP satellites were received by Edson Pereira PY2SDR, Nicolás Castro CD3NDC, Robert Mattaliano N6RFM and many other radio amateurs around the world.

Chen Yue with 435/2250 MHz feed for the 12m dish at the DSLWP ground station - Image credit Wei Mingchuan BG2BHC

Chen Yue with 435/2250 MHz feed for the 12m dish at the DSLWP ground station – Image credit Wei Mingchuan BG2BHC

Wei Mingchuan BG2BHC reports the first launch window will open at about 21:28 GMT Sunday, May 20. The transmitters will be activated soon after separation. Satellite A will transmit 500 baud GMSK with 1/4 turbo code on 435.425 MHz and 250 baud GMSK with 1/2 turbo code and precoder on 436.425 MHz, and satellite B will transmit 500 baud GMSK with 1/4 turbo code on 435.400 MHz and 250 baud GMSK with 1/2 turbo code and precoder on 436.400 MHz, in every 5 minutes by default. Each transmission will last about 16 seconds. Radio amateurs in South America will have the earliest chance to receive the signals from the satellites, then North America, Oceania, Asia, Europe and Africa.

Harbin Institute of Technology Amateur Radio Club expects radio amateurs to join in this mission. We will prepare different QSL cards for different flight phase for amateurs successfully made QSO or received telemetry. Awards will also be given to the first 10 amateurs in each continent who successfully decoded the signals from the satellites, received the most number of packets, or received an image. Your participation will also help the team to get a better knowledge of the status of the satellites.

An open source decoding software based on GNU Radio to work with RTL-SDR and USRP is provided. Not difficult to change the grc files to support other SDR receivers. A small proxy software will send the decoded data to a server for real-time display.

IARU frequency coordination page:
http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=530

Link budgets: http://lilacsat.hit.edu.cn/wp/?page_id=676

Decoder (GNU Radio OOT module): https://github.com/bg2bhc/gr-dslwp

Decoder (Linux Live CD): https://1drv.ms/u/s!Av6J6WjI3UbMhHm8gwMr4Z_keqWH

TLE: http://lilacsat.hit.edu.cn/tle/dslwp.txt

DSLWP-A Telemetry Display: http://lilacsat.hit.edu.cn/dashboard/pages_en/telemetry-a.html

DSLWP-B Telemetry Display: http://lilacsat.hit.edu.cn/dashboard/pages_en/telemetry-b.html

Wei Mingchuan BG2BHC Bug Fix 2018-05-20-1728-GMT: (Check BG2BHC Twitter feed for any further updates)

Sorry to find a bug in the DSLWP live cd! This bug will make the upload of data fail, so it is important to fix it. Please close the proxy, open a new terminal, and type in the following commands:

sudo python -m pip uninstall tornado

sudo python -m pip install tornado==4.5.3

The password is lilac
After running these commands, the bug should be fixed.

DSLWP Lunar Satellite

DSLWP Lunar Satellite

DSLWP Lunar Amateur Radio Satellites

Hu Chaoran BG2CRY tests 435/2250 MHz dish feed for DSLWP ground station - Image credit Wei Mingchuan BG2BHC

Hu Chaoran BG2CRY tests 435/2250 MHz dish feed for DSLWP ground station – Image credit Wei Mingchuan BG2BHC

Two microsatellites DSLWP-A and DSLWP-B carrying amateur radio payloads are planned to launch with the Chang’e 4 Relay satellite on a CZ-4C from the Xichang Space Center into lunar orbit early Monday, May 21 Beijing time (2130 GMT May 20).

Chen Yue with 435/2250 MHz feed for the 12m dish at the DSLWP ground station - Image credit Wei Mingchuan BG2BHC

Chen Yue with 435/2250 MHz feed for the 12m dish at the DSLWP ground station – Image credit Wei Mingchuan BG2BHC

Wei Mingchuan BG2BHC reports DSLWP is a lunar formation flying mission for low frequency radio astronomy, amateur radio and education, consists of two microsatellites.

Developed by students at the Harbin Institute of Technology the amateur radio payload onboard DSLWP-A1 will provide telecommand uplink and telemetry / digital image downlink. An open telecommand is also designed to allow amateurs to send commands to take and download an image.

The satellites are 50x50x40 cm with a mass of about 45 kg and are 3-axis stabilized. Two linear polarization antennas are mounted along and normal to the flight direction.

The downlinks for DSLWP-A1 are 435.425 MHz and 436.425 MHz while downlinks for DSLWP-A2 are 435.400 MHz and 436.400 MHz using 10K0F1DCN or 10K0F1DEN. Will use 250/500 bps GMSK with turbo code or JT4G. Uplinks are reported to be in the 144 MHz band.

Nico PA0DLO says the two satellites, (also known as LongJiang 1 and 2) are planned to perform formation flying in a high elliptical orbit around the Moon (300 x 9000 km).

After launch it will take about 4 and a half days to reach the Moon. This GMAT script should work well for the first days after launch
https://hamsat1.home.xs4all.nl/LongJiang_NYC.script

The groundstation used in this script is a random location in New York City. You can change this to your location by updating the values under the GroundStation tab in GMAT.

DSLWP Radio Information http://lilacsat.hit.edu.cn/wp/?page_id=844

Harbin Institute Of Technology Amateur Radio Club BY2HIT
Weibo: http://www.weibo.com/by2hit
QRZ: http://www.qrz.com/db/BY2HIT
Web in Google English: http://tinyurl.com/BY2HIT

Wei Mingchuan BG2BHC
https://github.com/bg2bhc/
https://twitter.com/bg2bhc

IARU Amateur Satellite Frequency Coordination pages http://www.amsat.org.uk/iaru/

DSLWP Lunar Satellite

DSLWP Lunar Satellite

Lunar Amateur Radio Satellites DSLWP-A1/A2

Full Moon 2010 - Credit Gregory H Revera

Full Moon 2010 – Credit Gregory H Revera

Mingchuan Wei BG2BHC reports DSLWP is a lunar formation flying mission for low frequency radio astronomy, amateur radio and education, consists of 2 microsatellites.

Developed by students at the Harbin Institute of Technology the amateur radio payload onboard DSLWP-A1 will provide telecommand uplink and telemetry / digital image downlink. An open telecommand is also designed to allow amateurs to send commands to take and download an image.

The satellites are 50x50x40 cm with a mass of about 45 kg and are 3-axis stabilized. Two linear polarization antennas are mounted along and normal to the flight direction.

The team proposes downlinks for A1 on 435.425 MHz and 436.425 MHz while downlinks for A2 would be 435.400 MHz and 436.400 MHz using 10K0F1DCN or 10K0F1DEN 250 bps GMSK with concatenated codes or JT65B.

Planning a launch into a 200 x 9000 km lunar orbit in June 2018. Further info at http://lilacsat.hit.edu.cn/

IARU Amateur Satellite Frequency Coordination pages http://www.amsat.org.uk/iaru/

5 GHz to 10 GHz Lunar Transponder Mission

View of Earth from the Moon AdobeStock_77398324AMSAT-NA plans 5 GHz to 10 GHz transponders on a spacecraft expected to launch in September 2018 into a Lunar orbit.

Heimdallr is a 3 axis stabilized 6U CubeSat with a mass of approximately 8 kg. It will have a Cold Gas Thruster for inertia dump and a star tracker for navigation. Deployable, gimbled solar panels will produce up to 100 watts of DC power, electric propulsion will be used to achieve lunar orbit.

There will be a combination of omni and directional patch antennas on one side of spacecraft.

The first part of mission is to provide Telemetry, Tracking, and Command (TT&C) to obtain lunar orbit. The second part is to perform the data downlink experiment while the final part is to provide a two way regenerative repeater and analog repeater in lunar orbit for lifetime of satellite.

Proposing these downlinks:
• Omni transponder: 10.451 GHz +/- 0.5 MHz
• Directional transponder: 10.4575 GHz. +/- 3.5 MHz
• Analog transponder: 10.4665 GHz. +/- 2.0 MHz

For the first part of the mission (TT&C) using 300 bps BPSK 1/2 rate viterbi Ranging 1.5 Mbps BPSK DSSS. For the  second part of mission 4.5 Mbps QPSK ½ rate DVB-S2. For the final part of mission 25 kbps BPSK 1/5 rate DVB-S2.

Proposing these Uplinks
• Omni transponder: 5.651 GHz +/- 0.5 MHz
• Directional transponder: 5.6575 GHz. +/- 3.5 MHz
• Analog transponder: 5.665 GHz. +/- 2.0 MHz

A link budget is available at
https://drive.google.com/folderview?id=0B3u-mSOWBMISYnZyZGJpeThKeU0&usp=sharing

It is anticipated that a 1 or 2 metre dish will be required using the AMSAT designed ground station equipment.

Source IARU Satellite Frequency Coordination Status pages http://www.amsat.org.uk/iaru/

Heimdallr satellite – 5 Teams Share First Round of NASA CubeSat Prizes
http://spacenews.com/5-teams-share-first-round-of-nasa-cubesat-prizes/

 

UK CubeSat Forum – Lunar opportunity

View of Earth from the Moon AdobeStock_77398324Surrey Satellite Technology Ltd (SSTL) and Goonhilly Earth Station (GES) are looking for CubeSat passenger payloads on a Lunar mission.

SSTL and GES are teaming up with ESA to create the world’s first commercial deep space mission. They plan to carry customer payload in the form of CubeSats into lunar orbit and provide the relay link back to Earth via Goonhilly. The launch is planned for 2019.

Orbital passengers e.g. nanosatellites and CubeSats will be deployed from the Mothership and will operate in lunar orbit.

The UK CubeSat Forum can help in creating new contacts for joint proposals, so do post on their site should you want to be involved!
http://www.cubesatforum.org.uk/wordpress/2016/08/30/call-for-lunar-missions-payloads/

Twitter: https://twitter.com/UKCubeSatForum

Download the related documents from http://www.goonhilly.org/lunar

4M – End of Mission

LX0OHB-4M amateur radio lunar payload - Credit LuxSpace

LX0OHB-4M amateur radio lunar payload – Credit LuxSpace

The JT65B amateur radio payload, which successfully completed a lunar flyby, has fallen silent after transmitting for 438 hours.

During the afternoon of November 10 the battery voltage dropped from 13.1V to 12.1V and continued falling. The last signal was received by Rein W6SZ at 01:35 UT on November 11 when the battery voltage had fallen to 8.4 volts.

Ghislain LX2RG posted the following to the Moon Net list:

Here at Luxspace, we have to thank you all for the reports, for the tracking, and we also hope that we provided you with the challenges you expected.

4M may possibly awaken from time to time if illumination becomes better.

We shall now endeavor to prepare the next one.

Manfred Memorial Moon Mission (4M) LX0OHB-4M http://moon.luxspace.lu/blog/

4M Lunar Payload https://amsat-uk.org/2014/10/15/4m-lunar-payload-integrated-keps-released/