image livestream, sending the largest, highest, fastest images ever sent in realtime from the stratosphere by amateurs, with 10mW of radio power – as much as a single LED. We had two payloads attached to a weather balloon, and reached 36km altitude. We sent out and received live images as it was flying, plus GPS information, that everyone could receive and automatically post online for everyone to see – in real time!
All scripts, PCB designs, etc, are all available for you under a creative commons licence. I’ll be posting those later.
Feel free to leave a comment below, providing some feedback, e.g. stating what we can do better next launch, what sensors you would like to see in them, etc!
||€150 (just helium+balloon)
||12:36 (11-09-2011 Delft Netherlands)
||15:00 (11-09-2011 Heereveen Friesland)
||35.748 m (#28 arhab record)
|# Pictures Taken
|# Pictures Sent Live
|# Pictures Received Live
|# Data Received Live
|| 6.000.000 bits
|# Max Data Rate
|Largest image sent live
||800×592 px (#1 record)
|3D Distance Traveled
|Minimum inside temp
||10mW (434.653MHz, 8n2)
[caption id="attachment_1862" align="aligncenter" width="300" caption="An overview (after launch)"][/caption]
[caption id="attachment_1846" align="aligncenter" width="459" caption="The route (no altitude data after burst)"][/caption]
Some Live images we received
We received 5.632.000 bits correctly for our images. These were 119 images that were sent over that we all received almost all entirely. Here is my pic of three images that sum it up.
[caption id="attachment_1828" align="aligncenter" width="320" caption="The first image sent over right before launch"][/caption]
[caption id="attachment_1829" align="aligncenter" width="300" caption="Image sent over live at around 33km altitude. The top part was lost in reception - click on it for full size"][/caption]
[caption id="attachment_1830" align="aligncenter" width="320" caption="Image shot at 36km altitude. When we received this, we knew it had burst above the Ijsselmeer!"][/caption]
3D Stereo roundshot of the Payloads
Retrieving the Payload
[caption id="attachment_1847" align="aligncenter" width="372" caption="Eric had to drive 1 minute to the landing site."][/caption]
[caption id="attachment_1848" align="aligncenter" width="365" caption="Eric spotted it: hanging from a building!"][/caption]
[caption id="attachment_1859" align="aligncenter" width="150" caption="Payload retrieved!"][/caption]
What was in the Main Payload?
[caption id="attachment_1864" align="aligncenter" width="150" caption="The main payload and its crib"][/caption] [caption id="attachment_1863" align="aligncenter" width="150" caption="Insides of the main payload"][/caption]
What was in the Backup Payload?
[caption id="attachment_1866" align="aligncenter" width="150" caption="The backup payload"][/caption] [caption id="attachment_1865" align="aligncenter" width="150" caption="The insides of the backup payload"][/caption]
So how do we send and receive stuff live?
You will learn by watching this video:
1700 images taken, 123 images sent
Sending an image took between 10seconds and 60 seconds. Within the time of sending an image, the webcam had taken much more. So, which one should it send next? The latest? No. Logically it would be, the prettiest or the best. So i made a simple algorithm that chooses the best image from two factors: (1) a mean grey value (2) a 8-bit standard deviation of ideally 30, so, not too much deviation in the image, but also not too little. You can read all about that algorithm in my post here
Some Other Data
[caption id="attachment_1834" align="aligncenter" width="506" caption="You can clearly see a steady velocity in height. The temperature data is from the backup-payload inside the plastic container. This confirms my theory that you dont need to worry about isolation for temperature, as there is little mass to transfer the cold at -50C at 30km altitude."][/caption]
Final KML (Google Maps) 3d routeLogfile from the Backup Payload (Time, Gps, battery, temperature)Logfile from Main Payload (Time, Gps, *rest didnt work)
In my other post, i talk about the subparts of this module.
Here you can read about the Battery Module i designed
Here you can read about the GPS module i designed
Here you can read how to build this proper antenna yourself
Here you can read how to make a high-altitude cutdown mechanism
Information on the Backup Payload on Space Camera Live 1
Information about the Main Payload on Space Camera Live 1
Phillip Heron, for inventing SSDV we use for image transfer and image hosting. Daniela & Mathijs, at mission control. Special thanks to: Wouter Weggelaar [PA3WEG] & Eric de Jong for valuable tracking and recovering. Made possible by: Jacco Hoekstra, Michel Badoux & Jan Siebring from TU Delft Aerospace faculty. Onno for driving. Pictura for the car rental. All members of UKHAS.]]>