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Author: Thaleia Nikolaidou<br>
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<p><font face="Calibri,Arial,Helvetica,sans-serif" color="black" size="3"><span style="font-size:12pt;background-color:white;" dir="ltr">Dear Colleagues:<br>
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We would like to announce the next version 5.9.1 of the UNB GPS Analysis and Positioning Software (GAPS).<br>
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The new version of our precise point positioning software includes several updates and new features as listed below:<br>
• Creation of GAPS "Basic" and "Advanced" user submission pages.<br>
- GAPS "Basic" user submission page allows for quick and easy submission of observation files for users who frequently use GAPS' default processing options.<br>
- GAPS "Advanced" user submission page includes:<br>
• User-selection of the orbit and clock products to be used.<br>
• User-selection of the carrier-phase and pseudorange observables to be used.<br>
• Optional use of GPS L2C in place of P2 for all satellites currently transmitting L2C.<br>
• Optional use of GPS L5 in place of L2 for all satellites currently transmitting L5.<br>
• Optional use of static-mode satellite clock interpolation (if 30s clock product is used and logging interval < 30s).<br>
• User-selection of GDOP cut-off threshold.<br>
• User-selection of positional convergence condition and maximum number of iterations for least-squares filter.<br>
• Enhanced the cycle-slip detection algorithm (following Blewitt, 1990).<br>
• A minimum of 4 satellites per epoch are required before estimation begins.<br>
• User-selection of all available neutral atmosphere delay (NAD) prediction model and mapping function (MF) combinations.<br>
- NAD prediction models include: UNB-VMF1 (NCEP), UNB-VMF1 (CMC), VMF1 (ECMWF), UNB3m, GPT2 (1x1 deg.), ESA 2.5 and None<br>
- Mapping function options are: Vienna MF and Niell MF.<br>
• User option to not estimate NAD.<br>
• User option to not estimate tropospheric gradients.<br>
• Optional use of a user-provided receiver antenna calibration file.<br>
• NAD estimation automatically terminated if receiver rises above neutral atmosphere threshold (50,000 ft = 15,240 m).<br>
• Added option to estimate precipitable water (if a meteorological file is submitted).<br>
• New .ion, .cmp, .nad, and .DOP output files as well as modified formatting of the .par file.<br>
• Improved reporting of processing parameter options and results in the HTML output.<br>
• Added receiver clock and DOP plots.<br>
• Added height component to kml output.<br>
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For information on the processing strategy please visit the following Web page:<br>
<a href="http://gaps.gge.unb.ca/gaps_summary.txt" target="_blank">http://gaps.gge.unb.ca/gaps_summary.txt</a><br>
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Your feedback (suggestions, bug reports, etc.) is welcome via the GAPS Development Team email: [gaps@unb.ca]gaps@unb.ca<br>
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To use GAPS, please visit the following Web page:<br>
<a href="http://gaps.gge.unb.ca" target="_blank">http://gaps.gge.unb.ca</a><br>
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With best regards,<br>
The GAPS Development Team</span></font><br>
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