Phonesat – Pictures

The Nasa Phonesat team have now put up the partially completed jigsaw puzzle formed from the submitted picture packets received from Graham and Bell over the past week. They can be viewed here

Over the last few days I have been getting quite a decent number of packets, including pictures from all three phonesats however a number of the picture packets despite being verified and accepted when submitted to the website have returned seemingly invalid webp files.

It appears the images are being broadcast in three forms, a low resolution background, then a medium resolution followed by a high resolution, slowly building up the final images.

The picture from Graham
 
The picture from Bell

More PhoneSat pictures and other packets

Had chance to process the 14:05BST PhoneSat pass IQ file and have got some more image pieces (again I have scaled them up from the original 20 x 15 pixel size)

Also decode a few more data packets,  from Graham and Bell the PhoneSat 1.0 Satellites

Also got a sensor packet from Alexandra (the PhoneSat 2.0 Beta Satellite)

These packets not be encoded; and are plain ASCII characters. There are 5 types of packet:

Sensors from the phone

  • Time: unix time time in milli seconds.
  • Reboot: number of reboots of the phone.
  • Counter: number of packets sent since the beginning of the mission.
  • Packet type: for this packet will be sensors from the phone (1).
  • Phase: phase in which the satellite is (we have 3 phases).
  • Compass: magnetic field value for X, Y, Z axes from the phone sensor in nanoTesla.
  • Gyro: spin rate for X, Y, Z axes from the phone sensor in deg/sec.
  • Accel: accelerometer value of X, Y, Z axes from the phone sensor in m/sec2
  • Format: [Time, Reboot, Counter, Packet Type, Phase, CompassX, CompassY, CompassZ, GyroX, GyroY, GyroZ, AccelX, AccelY, AccelZ]

My packet was
[1262348062776;11;489;1;3;30.4;38.8;13.2;80.2;-5.7;-68.5;-0.5;0.1;-0.6]

So 1262348062776 milliseconds (this doesn’t look right, gives 01 January 2010 12:14:23!)
Reboot number 11
489 packets
Packet type 1
Phase 3
Compass X = 30.4, Y = 38.8, Z = 13.2
Gyro X = 80.2, Y = -5.7, Z = -68.5
Accel X =  -0.5, Y=  0.1, X= -0.6

First Phonesat Image Piece

Before leaving for work this morning I set up the 70cm yagi on the tripod pointing due south at around 45 degrees inclination and my ancient laptop with the original FUNCube dongle, hoping to catch some more PhoneSat packets during this afternoons passes, the first at 12:30BST, the other around 14:05BST.

I was hoping to be home for the later one, but unfortunately I was held up and wasn’t, luckily I was able to set both of them to record by logging in remotely. But due to the fixed antenna meant I only was able to get the optimum signal for part of the pass.

Still I grabbed the file for the first pass and was able to analyse the resulting IQ file during a coffee break and successful decoded a handful of packets.

I was especially eager to see the result as in my mailbox this morning was a message from the PhoneSat team

Let the puzzle begin

As scheduled, Graham and Bell have just started transmitting picture packets, so please stay tuned to your radio. Since the picture packets need to be stitched to restore the complete Earth picture, we will need as many packets as possible. Ultimately a new page will be created to display the current construction of the pictures. Let the puzzle begin!

Best regards,
The PhoneSat team

Indeed one of the packets was an image piece, however my excitement was quickly tempered when I discovered it was infact just 20 x 15 pixels in size!

fm KJ6KRW-2 to CQ-0 via TELEM-0 UI  PID=F0
.5qjuM1K$e67WJJ/!*;TU:f^CP+D(TR!0REaSH12S!”T&n/J<h*!s!j:!*GO@$.A#;”qkt2UoORH!%-Lqr;^40b;k;a]Q,IYQ(B:[r-<:($p+rslDDQi<`UrfGn1-d^+^e8XV&5%nr[AFM,_?q18$!:`kk&-).

Produced this image, which I have scaled up to 200 x 150 pixels! A hint of blue, cloud and land?

The picture packets are decoded as.webp pictures. These pictures can be converted into png pictures using Google’s webp converter.