ALIEN – ALtitude Imaging Entering Near-space

April 15, 2009

Workshop 1.5 – Picture Post

To show you what I’ve been doing since Workshop 1, here is a large serving of pictures, and a video of the hacked shutter in action.

The Camera in Action

The GPS in Action

Hooking it up for the second time, I did a few test runs, and in order to keep the coordinates of my house safe I won’t post the logs. However, I did get info on the format of the NMEA sentences and extracted the information relevant to us. The Lassen iQ only transmits 2 sentences out of the box, and although you can configure it otherwise with TSIP, we’ve kept it just sending Fix and Velocity info. The contents of my NMEA-notes is available below, or via the more… button.

### Essential fix data ###

$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
where:
     GGA          Global Positioning System Fix Data
     123519       Fix taken at 12:35:19 UTC
     4807.038,N   Latitude 48 deg 07.038' N
     01131.000,E  Longitude 11 deg 31.000' E
     1            Fix quality: 0 = invalid
                               1 = GPS fix (SPS)
                               2 = DGPS fix
                               3 = PPS fix
                   4 = Real Time Kinematic
                   5 = Float RTK
                               6 = estimated (dead reckoning) (2.3 feature)
                   7 = Manual input mode
                   8 = Simulation mode
     08           Number of satellites being tracked
     0.9          Horizontal dilution of position
     545.4,M      Altitude, Meters, above mean sea level
     46.9,M       Height of geoid (mean sea level) above WGS84
                      ellipsoid
     (empty field) time in seconds since last DGPS update
     (empty field) DGPS station ID number
     *47          the checksum data, always begins with *

### Velocity, track and heading over ground ###

$GPVTG,000.0,T,005.5,M,000.0,N,000.0,K,A*23
where:
        VTG          Track made good and ground speed
        054.7,T      True track made good (degrees)
        034.4,M      Magnetic track made good
        005.5,N      Ground speed, knots
        010.2,K      Ground speed, Kilometers per hour
        A            Type of fix, A = autonomous
        *48          Checksum
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