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-A1 and DSLWP-A2 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 live CD now ready for download https://1drv.ms/u/s!Av6J6WjI3UbMhHm8gwMr4Z_keqWH

GNU Radio OOT Module for DSWLP, a lunar formation flying mission consists of 2 microsatellites
https://github.com/bg2bhc/gr-dslwp

Further DSLWP info at https://web.archive.org/web/20170827105714/http://lilacsat.hit.edu.cn:80/

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

Ham radio goes around the Moon

Full Moon 2010 - Credit Gregory H Revera

Full Moon 2010 – Credit Gregory H Revera

Towards the end of the year radio amateurs will have the opportunity to receive what must be the ultimate DX from a ham radio payload transmitting the data mode JT65B as it flies around the Moon.

Beijing plans to send a lunar orbiter around the Moon carrying a 14 kg battery powered payload known as 4M-LXS which was developed at LuxSpace. The amateur radio payload will transmit a JT65B signal on 145.990 MHz which can be decoded by radio amateurs using the free WJST software.

The orbiter is one of the test models for Beijing’s new lunar probe Chang’e-5, which will be tasked with landing on the moon, collecting samples and returning to Earth. The launch, planned for 4th quarter 2014, is aimed at testing the technologies that are vital for the success of Chang’e-5. The orbiter will be launched into Lunar Transfer Orbit (LTO) then will perform a flyby around the Moon and re-enter the Earth’s atmosphere after 9 days.

Delivery convoy - Image credit Xinhua

Delivery convoy – Image credit Xinhua

The orbiter arrived by air in Xichang, Sichuan on Sunday, August 10 and was then transported to the Xichang Satellite Launch Center.

Beijing to test recoverable moon orbiter
http://news.xinhuanet.com/english/china/2014-08/10/c_133546027.htm

IARU Satellite Frequency Coordination Pages http://amsat.org.uk/iaru

Free WSJT Software http://physics.princeton.edu/pulsar/K1JT/