Hi Zach,

The reason against JPEG is primarily because of the corruption capabilities. If the first packet is not received (which is often the case), the entire image will be corrupt. If a single packet is missed, it ruins the image for all of the packets after.

Multiple satellites use raw JPEG in space currently, and it is not working well.'

A better format to use would be SSDV (https://github.com/fsphil/ssdv), which has been tested on HAB flights for a long time, and was originally implemented on an Atmega328!

It retains the JPEG compression capabilities, while simultaneously protecting the imagery against potential packet loss.

There were only three satellites that I know of that used SSDV in space, that is, GASPACS-1 and the Chinese Lunar Orbiter cubesats a while ago.

On Thu, Oct 26, 2023 at 3:46 PM Zach Metzinger via AMSAT-BB < amsat-bb@amsat.org> wrote:

On 10/26/23 14:13, Sasha Tim via AMSAT-BB wrote:

...

Any projects working on getting into MEO: PLEASE put in a camera (and transmit in a format that is not JPEG)!

Hello Sasha,

Cameras do require a license, at least for the US. Not insurmountable, but one has to consider this aspect.

What's wrong with JPEG? You'd prefer GIF? (or TIFF?) :-)

--- Zach N0ZGO

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