<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div class="" style=""><span class="" style="">In terms of data interfaces, is SSR-6TR can be directly connected to a PC or via a microcontroller (eg arduino)?</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span class="" style="">I'm still newbie to connect SSR-6Tr to PC, especially the pin?</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 13px; font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span class="" style="">Could we use u-center?</span></div><div class="" style="color: rgb(0, 0, 0); font-size: 13px;
font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; background-color: transparent; font-style: normal;"><span class="" style="">Thank you in advance<br class="" style=""><br></span></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 10pt" class=""> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12pt" class=""> <div dir="ltr" class="" style=""> <font size="2" face="Arial" class="" style=""> On Friday, January 24, 2014 2:40 AM, jbeale1 <beale@bealecorner.com> wrote:<br class="" style=""> </font> </div> <div class="" style="">After taking advantage of the $35 deal on the SSR-6Tr board from Synergy<br class="" style="">Systems, I have my u-blox LEA-6T-0 logging RXM-SFRB, and at 5-second<br class="" style="">intervals RXM-RAW
messages. Antenna is a $6 puck from Ebay sitting flat on<br class="" style="">the peak of a metal tile roof, with a clear sky view in nearly all aziumuth<br class="" style="">directions down to 10 degrees elevation, and signal going through about 130<br class="" style="">feet of RG-6/U coax into a 3-way 2GHz CATV splitter (for possible comparison<br class="" style="">with other units, although I'm not doing that now).<br class="" style=""><br class="" style="">I am using RTKCONV & RTKPOST version 2.4.2 in "PPP Static" mode with<br class="" style="">"Combined" fwd/back filter, 35 dB/Hz cutoff on all elevations and GPS+SBAS.<br class="" style="">Ignoring a few obvious single-point outliers (phase slips?) over a 24 hour<br class="" style="">time period, the solution ground track fits into a box 10 cm (E/W) x 6 cm<br class="" style="">(N/S). STD=E: 0.0295m N: 0.0205m U: 0.0900m<br class="" style="">The following day, a second 24 hour data set gives me a
track 15 cm x 5 cm<br class="" style="">and STD=E: 0.0526m N: 0.0131m U: 0.0303m and the two days' results differ<br class="" style="">overall by about 6 cm. I played with doing 0, 5, 10 and 15 degree cutoffs,<br class="" style="">but found I got the best (lowest deviation) results using the whole sky.<br class="" style=""><br class="" style="">So this gives the appearance of a consistent solution at the 10 cm level.<br class="" style="">This seems almost too good to believe. Note I am not using any external CORS<br class="" style="">data, just what is broadcast and logged directly by a single LEA-6T<br class="" style="">receiver. Is this performance expected of PPP mode from a cheap L1-only<br class="" style="">system? <br class="" style=""><br class="" style="">I haven't tried observing at a known geodetic reference point so I can only<br class="" style="">speak to apparent precision, not absolute accuracy. If my solution is good,<br class=""
style="">the google maps satellite image appears to be about 50 cm off at my location<br class="" style="">in San Jose, CA.<br class="" style=""><br class="" style="">I also tried a Static solution pairing with CORS base station but the<br class="" style="">closest one is about 25km away and the result was a very scattered cloud of<br class="" style="">points about 5 m in diameter, so probably I am doing something wrong.<br class="" style=""><br class="" style=""><br class="" style=""><br class="" style="">--<br class="" style="">View this message in context: <a href="http://open-source-gps-related-discussion-and-support.1099874.n2.nabble.com/RTKLIB-uBlox-LEA-6T-PPP-Static-to-10-cm-Is-it-real-tp7572802.html" target="_blank" class="" style="">http://open-source-gps-related-discussion-and-support.1099874.n2.nabble.com/RTKLIB-uBlox-LEA-6T-PPP-Static-to-10-cm-Is-it-real-tp7572802.html</a><br class="" style="">Sent from the Open Source GPS-related discussion
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