Repeating my previous e-mail:
Finally, while the extra information you have provided is useful (e.g. the documentation of the CW telemetry), it is incomplete. A closed-source binary does not constitute complete documentation of your downlink telemetry. - Table 7.1 shows a list of parameters, but it does not define the data-types, or conversions for each of them. This is necessary to decode the telemetry. - Your software decodes the SSDV imagery, but there is no information in your documentation on how the imagery is encapsulated and transmitted. Is this purely SSDV packets (e.g. encoded using https://github.com/fsphil/ssdv ) encapsulated in AX.25 frames?
73 Mark
On Sun, Mar 21, 2021 at 3:42 AM BCCSAT 01 [email protected] wrote:
Sorry for the inconvenience. We have updated our website to include Radio Specifications, CW Telemetry Format, GMSK Decoder Program. (http://bccsat.bcc.ac.th/amateur-radio/) PS. Currently, we only have an operation manual in Thai language. However, we will translate it into english as soon as possible.
Sincerely, BCCSAT-1 Team
On Fri, Mar 19, 2021 at 6:26 PM Mark Jessop [email protected] wrote:
Hmm that does look similar doesn't it... (The block diagram for KnackSat is here: https://drive.google.com/file/d/0B4dwLLK3X59yekd6ekc5a284TEE/view )
Hopefully the BCCSAT team will release information on their downlink telemetry before the launch. As per the IARU satellite coordination documentation: "With the exception of control signals exchanged between earth command stations and space stations in the amateur-satellite service all amateur signals shall not be encoded for the purpose of obscuring their meaning. To meet this requirement, operators of satellites in the amateur-satellite service must publish full details of their modulation, encoding and telemetry formats and equations before launch."
It's quite sad how many satellites are being launched taking advantage of the amateur radio satellite spectrum without giving anything back to the amateur radio community. I realise developing a cubesat is a challenge (I'm working on one myself... though not using the amateur bands), and that time may be short - but cubesat teams should remember that their 'free' access to amateur radio spectrum comes at the price of openness and transparency with respect to your satellites transmissions. There's heaps of amateur radio operators out there that would love to help receive telemetry from your satellites... but if you don't release any information then we can't help you.
73 Mark VK5QI
On Fri, Mar 19, 2021 at 7:43 AM KI7UNJ Tucker [email protected] wrote:
Mark,
What it looks like to me they are using the same freq as Knacksat... heck seems like almost the same technology on board as Knacksat.
http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=520
On Thu, Mar 18, 2021 at 1:42 PM Mark Jessop [email protected] wrote:
Hi Tanan,
Can you please point us to the specifications for your 9k6 and 1k2 telemetry downlinks? Usage of the amateur radio band requires that satellite operators release all their telemetry formats. This allows interested amateurs to be able to have a go at decoding telemetry, and allows projects like SatNOGS to help collect telemetry using the huge networks of volunteer ground-stations.
In particular I would be very interested to decode the SSDV data.
Also, it looks like this frequency was not coordinated with the IARU - or at least it's not showing up on the IARU coordination list ( http://www.amsatuk.me.uk/iaru/finished.php ).
73 Mark VK5QI
On Fri, Mar 19, 2021 at 5:12 AM Tanan Rangseeprom [email protected] wrote:
BCCSAT-1 is an educational multi-spectral Cubesat 1U developed by the cooperation between Bangkok Christian College and the King’s Mongkut university of technology north Bangkok. http://bccsat.bcc.ac.th/
Schedule When our cubesat is completely finished it will be launched into space in March 20,2021 06.07 AM UTC at Russia with the Soyuz-2.1 rocket by UNISAT-7 GAUSS SRL to the low earth orbit at 575 km. http://en.roscosmos.ru/21973/ and https://www.roscosmos.ru/30285/
BCCSAT-1 1 99999U 21999A 21079.53571058 -.00000058 00000-0 00000+0 0 06 2 99999 098.4012 345.1641 0004344 283.2593 155.6823 14.80364805 03
Downlink Frequency Beacon 435.635 MHz CW https://www.youtube.com/watch?v=hPpSTEf3PUI Slow Scan Digital Video SSDV Data 435.635 MHz AFSK 1.2 kbps Telemetry Data 435.635 MHz GMSK 9.6 kbps
After launch into space if AMSAT member receives the CW signal of BCCSAT-1 satellite. please send information to our team directly an email to: [email protected]
BCCSAT-1 is a technology demonstration satellite in Thailand. High school students in Bangkok Cristian College in collaboration with King Mongkut’s University of Technology (KMUTNB) and the Radio Amateur Society of Thailand (RAST) https://www.youtube.com/watch?v=zEcg5q7ZBw0 are building the satellite.
The project aims to build capacity on systems engineering, space education, and radio communication technology to students. During the project, students will learn about communication technology through amateur radio activities. It also encourages other interested people to receive the satellite signal.
The main missions of BCCSAT-1 include: (1) testing in-house developed satellite transceiver and antenna in orbit (2) experiment of Slow-Scan Digital Video (SSDV) transmission from the satellite (3) take pictures of Earth by cameras onboard satellite
BCCSAT-1 communication subsystem is an in-house developed transceiver and antennas. It has the capability to transmit GMSK modulation signal at 9.6 kbps, FSK for SSDV at 1.2 kbps and receive AFSK signal at 1.2 kbps. The transceiver will send its parameter such as RSSI and temperature to the ground station.
BCCSAT-1 will carry four cameras onboard the satellite and aim to capture images of the Earth in different wavelengths: red, green, blue, NIR, and Red Edge band.
We hope to process the images acquired for the Normalized Difference Vegetation Index (NDVI) and widely used in Science education. The images will be widely distributed among amateur radio community via the experiment of SSDV transmission system and GMSK packets downlink. Moreover, BCCSAT-1 will be able to transmit pre-stored images chosen by high school students.
BCCSAT-1 will provide the multi spectral images by having the total of 5 cameras on board; Red, Green, Blue, NIR, and Red Edge bands. The images we get from these cameras will be used to process for the Normalized difference vegetation index (NDVI), that will significantly provides huge advantage on analyzing the terrain of the country.
73 Tanan Rangseeprom , HS1JAN
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Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program!
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-- *Casey Tucker KI7UNJ* https://twitter.com/KI7UNJ