[meteorite-list] GPS: Channels, post-processing, DGPS and AD at bottom

From: Darryl Pitt <darryl_at_meteoritecentral.com>
Date: Thu, 12 Jul 2007 09:00:45 -0400
Message-ID: <850BCC01-D9B6-49A7-812A-1B342B014675_at_dof3.com>

copyrighted materials is the same as intellectual property.
unregulated copying and distribution of property = thievery.

and one has to love....

> I would recommend, rather than Garmin, the Magellan
> explorist-series 14 channel receivers(with dual WAAS
> channel receiver dedication

followed up with....

> By the way, I have a Magellan eXplorist 200
> (14-channel WAAS, <3m) receiver for sale, in excellent
> working and good cosmetic condition

that's objective.



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On Jul 12, 2007, at 1:14 AM, Thaddeus Besedin wrote:

> Note: I support the unregulated copying and
> distribution of copyrighted materials, including
> music, software, and scientific literature.
> Garmin is the preponderant marketer and manufacturer
> of commercial recreational/navigational GPS devices,
> and so information regarding comparison to
> under-represented alternatives that are equal to or
> better than Garmin products is less commonly available
> than biased pro-Garmin Internet presence.
>
> Delorme Blue Logger GPS is a bluetooth-operated data
> logger with a SiRF IIe/LP low-power 12-channel chipset
> with WAAS DGPS capability (a single channel). It can
> log raw SiRF protocol binary data, with L1 carrier
> phase, C1 pseudorange, and D1 doppler encoding, which
> can be converted using the included software into RAW
> data, permitting differential post-processing against
> data, available online, from DGPS stationary
> continuous reference stations, once the RAW file is
> converted into RINEX using proprietary DeLorme
> software. 2.45-sigma accuracy is <1m, but, in open
> places, accuracy of <0.75m is possible. DeLorme is a
> little protective of its slight market share, so it
> packages its GPS Postpro 2.0 software with an
> Earthmate GPS receiver, which, if I am correct, must
> be used as a hardware key with the Delorme software.
> Warez are illusive and/or non-working. SiRF binary
> protocol is modified in the Delorme version of the RAW
> data file with proprietary sentences. An attempt to
> translate these in Mac OS X is at Sourceforge
> (http://bluelog.cvs.sourceforge.net/bluelog/). A
> comparison demonstrating the excellent accuracy of the
> Blue Logger against a Trimble Pathfinder Pro XR
> sub-meter beacon-based DGPS unit is at
> http://academic.sun.ac.za/forestry/precision/papers/39.pdf.
>
> I would recommend, rather than Garmin, the Magellan
> explorist-series 14 channel receivers(with dual WAAS
> channel receiver dedication) I have used these since
> 2005, and in non-forrested preliminary archaeological
> survey of land, are nearly always accurate to <2m
> (with sufficient satellite signal/channel activity).
> These are available for very low prices, and are
> certainly more accurate than the non-post-processed
> Garmin receivers of the same class (like the etrex
> series). Magellan receivers of this series cannot be
> post-processed.
> Garmin, if its binary data stream is logged, can be
> converted to RINEX for
> post-processing. I am not sure of the post-processed
> accuracy. Garmin data can be converted to RINEX using
> GRINGO software (http://www.helenav.nl/,
> http://gpsinformation.net/pseudorange.htm,
> http://www.ultimategps.com/garmin_gps_software.html).
>
> By the way, I have a Magellan eXplorist 200
> (14-channel WAAS, <3m) receiver for sale, in excellent
> working and good cosmetic condition (some abrasions
> and minor scratches). I want $40.
> -Thaddeus
>
>
>
>
>
>
>
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Received on Thu 12 Jul 2007 09:00:45 AM PDT