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Experimental Tags

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    The SG project aims to support detection of whatever tags we can.  This page will track such projects.

    2017 May 24 - Cornell (Gabrielson & Winkler) tags

    These solar-powered tags transmit at 434 MHz and emit a 32-bit ID code.  With the appropriate software update,
    one or more Cornell USB Tag XCVRs can be plugged into spare USB ports on an SG,  attached to an appropriate
    antenna, and then any tag detections they report will appear on the live web interface, the sensorgnome.org
    realtime page (for network-connected receivers) and in data files.  So far, the motus data processing does not
    extract these tags, but support is planned.  The software update complements normal operation of the SG, and detection
    of Lotek coded ID tags at 166.38 MHz continues as usual.

    Tag detections in raw sensorgnome data files look like this:

       T3,1495635412.948,50524F2C
       T2,1495635414.123,55554B2A
    

    where the number after the T is the USB port number, the second field is the timestamp (uncorrected for latency),
    and the third field is a 32-bit tag ID in upper-case hexadecimal notation.  These lines are interspersed with detections
    of Lotek tag pulses from funcubedongles, and other records.

    On the web interface, the Cornell Tab XCVR is listed in the device list, and any tag detections appear in the Live Tags
    window, labelled with "Cornell":

    SG-detecting_lotek_and_cornell_tags.png

    On the sensorgnome.org realtime summary page, detections of Cornell tags appear as in
    row 6 of the table in this screenshot:

    sg_org_realtime_screen_showing_Cornell_Tag_row_6.png

    Support for registering Cornell tag deployments and processing SG data for them
    is pending.

    Support for Cornell tag detections on the SG-Pi platform is also pending.

    Cornell XCVR Dongle - considerations

    Power consumption:  quick and dirty benchtop measurements show power consumption of
    approximately 0.25 W or less, so at most 25% of a single funcubedongle.

    Data size: a short field test suggested a 10% increase in raw file size for a single XCVR added to a system
    with 3 funcubedongles.

    Code stability:  there are only an additional ~20 lines of code active during data acquisition from the XCVR Dongle,
    in the file cornelltagxcvr.js  - see function CornellTagXCVR.prototype.gotTag()

    RF or other interference:  an 8 hour benchtop test showed no discernable effect on detection rates of a single Lotek tag
    active while a USRP simulated a medley of Cornell tags (3 funcubedongles + 1 Cornell XCVR):

    cornell_lotek_SG_test.png

    tag_detection_rates_by_type.png

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    FileSizeDateAttached by 
     cornell_lotek_SG_test.png
    bench-top test of simultaenous Lotek and Cornell tag detections
    42.24 kB17:28, 22 Jun 2017adminActions
     SG-detecting_lotek_and_cornell_tags.png
    SG web interface showing simultaneous detection of Lotek and Cornell tags
    204.36 kB16:13, 24 May 2017adminActions
     sg_org_realtime_screen_showing_Cornell_Tag_row_6.png
    screenshot of sensorgnome.org realtime page, showing a receiver which has detected a Cornell tag (row 6)
    395.07 kB16:13, 24 May 2017adminActions
     tag_detection_rates_by_type.png
    cumulative detections of Lotek and Cornell tags
    45.38 kB17:27, 22 Jun 2017adminActions
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