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sci.geo.satellite-nav (Global Satellite Navigation) (sci.geo.satellite-nav) Discussion of global navigation satellite systems (GNSS). Topics include the technical aspects of GNSS operation, user experiences in the use of GNSS, information regarding GNSS products and discussion of GNSS policy (such as GPS selective availability).

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NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012066 by Sam Wormley[_2_]
2012066------------------------ NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012066 SUBJ: SVN63 (PRN01) FORECAST OUTAGE SUMMARY JDAY 300/0229 - JDAY 300/0717 1. NANU TYPE: FCSTSUMM NANU NUMBER: 2012066 NANU DTG: 260720Z OCT 2012 REFERENCE NANU: 2012065 REF NANU DTG: 182235Z OCT 2012 SVN: 63 PRN: 01
October 26th 12 02:19 PM
by Sam Wormley[_2_] Go to last post
0 327
GPS+Galileo+Falcon 9 3 for 3, yeay ! by [email protected]
Dragon docked with the ISS, Falcon 9 didn't deliver ORBcomm precisely due to ISS launch requirements. If the launch wasn't to the ISS, the 2nd stage could have been relighted making up for the first stage one of 9 engine out condition (their on board software compensated perfectly for the primary mission), even Saturn V rockets suffered from in flight engine failures. But ORBcomm launch was an...
(Multi-page thread 1 2)
October 15th 12 06:29 PM
by [email protected] Go to last post
10 550
Observatory measures solar storms’ effects on polar GPS navigation by Sam Wormley[_2_]
Observatory measures solar storms’ effects on polar GPS navigation http://blogs.physicstoday.org/newspicks/2012/10/observatory-measures-solar-storms-effects-on-polar-gps-navigation/ The ionosphere is the first atmospheric layer that GPS radio signals encounter on their way from space-based satellites to Earth. When solar activity causes the layer to fluctuate, GPS signals can be...
October 11th 12 03:58 AM
by Sam Wormley[_2_] Go to last post
0 357
GPS IIF-3 Satellite Now Transmitting L1, L2 Signals by Sam Wormley[_2_]
GPS IIF-3 Satellite Now Transmitting L1, L2 Signals http://www.gpsworld.com/gps-iif-3-launch/ UPDATE: The GPS Block IIF-3 satellite, SVN65, began transmitting L1 and L2 signals as PRN24 on October 8. A number of stations of the International GNSS Service are now tracking the satellite. The satellite is included in broadcast almanacs although it is set unhealthy and will continue to be so until...
October 9th 12 10:18 PM
by Sam Wormley[_2_] Go to last post
0 271
2F-3 launched - 5 Oct by Alan Browne
QUOTE The launch took place at 8:10 a.m. local time from Space Launch Complex 37, according to Denver-based ULA, a Lockheed Martin-Boeing joint venture. GPS 2F-3 was placed into a roughly 17,600-kilometer orbit, where it will undergo a test and checkout period lasting for several weeks before replacing an older satellite in the constellation. /QUOTE mo...
October 7th 12 09:38 PM
by Alan Browne Go to last post
0 323
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012062 by Sam Wormley[_2_]
2012062------------------------ NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012062 SUBJ: SVN65 (PRN24) LAUNCH JDAY 278 1. NANU TYPE: LAUNCH NANU NUMBER: 2012062 NANU DTG: 041222Z OCT 2012 SVN: 65 PRN: 24 LAUNCH JDAY: 278 LAUNCH TIME ZULU: 1210
October 4th 12 07:30 PM
by Sam Wormley[_2_] Go to last post
0 262
Launch week for GPS IIF-3 by HIPAR
http://spaceflightnow.com/delta/d361/status.html Evidently the USAF will defer to SpaceX if they can't get the GPS off on either 4 Oct of 5 Oct. --- CHAS
October 2nd 12 12:57 AM
by Alan Browne Go to last post
1 351
GPS ruins everything! by Alan Browne
http://www.nytimes.com/2012/09/25/world/americas/in-ecuador-center-of-the-earth-is-a-little-off-kilter.html?_r=2&hp or http://tinyurl.com/9tc9dn6 -- "There were, unfortunately, no great principles on which parties were divided – politics became a mere struggle for office." -Sir John A. Macdonald
September 28th 12 09:16 AM
by J. J. Lodder Go to last post
7 414
Upcoming IIF launch, predictions by [email protected]
SVN 27 / PRN 27 will be replaced instead of SVN 39 / PRN 9 (the two form a tight pair). Rationale: A - A Delta V maintenance was scheduled for SVN 39. If that bird was about to be retired, why do maintenance on it right before it gets shut down ? B - Ephemeris / Clock performance of SVN 27 / PRN 27 is 30 cm worse than SVN 39. Why shutdown the better of the two, leaving the worse online...
September 26th 12 11:47 PM
by Alan Browne Go to last post
6 392
signal strength meter by Jim Whitby
I'm a decent tech, but not an engineer... I have a Tomtom 2535 gps. Nice unit blah blah. Some ( software? ) engineer decided to change the gps info display. It now contains a pic of earth with dots for satellites instead of a bar graph. Ok. No biggie. Except now there is a signal strength percent! Percent of what???
September 24th 12 09:31 PM
by Alan Browne Go to last post
9 704
Searchable archive of sci.geo.satellite-nav??? by Richard Owlett[_2_]
Once upon a time you could do a Google search for Usenet posts I just tried to search out some of my old posts when I was last interested in calculating position from RINEX format data (back in 2008-2010) I just did the search and got 30 hits *BUT* Google does not allow reading the posts. I suspect that you have to join Google groups to read them. I will not they are USENET post not google...
September 22nd 12 01:59 PM
by Richard Owlett[_2_] Go to last post
7 444
Meanwhile, back in August ... 2 sats came online by Alan Browne
GPS-2A-22 (Aug 1993) decommissioned in 2010 has been resurrected to replace GPS 2A-27. 2A-27 has a faulty clock. 2A-22 is SVN 35 (PRN 30) And a GPS IIF (16 July 2012 launch) is now online. SVN 63 (PRN 1). As of late August that means 31 active GPS satellites. GLONASS: 31 (23 online; 1 in maintenance status at present + 4 spares +
September 13th 12 10:14 PM
by Alan Browne Go to last post
0 304
Human error study / automobile GPS by Alan Browne
Yet another article about human error and GPS. http://www.nytimes.com/2012/09/02/technology/gps-and-human-error-can-lead-drivers-astray-digital-domain.html?ref=business -- "C'mon boys, you're not laying pipe!". -John Keating.
September 6th 12 07:59 AM
by miso Go to last post
5 444
Thoughts on GPS/GNSS from the CGSIC Meeting Held Earlier this Week by Marcelo Pacheco
http://www.gpsworld.com/survey/thoughts-gpsgnss-cgsic-meeting-held-earlier-week-13351 By: Eric Gakstatter .... 4. Of the 12 Block IIF GPS satellites being built, two are in orbit with the first being launched in 2010 and the second one last year. A third is scheduled to launch later this year. That equates to one launch per year. Clearly, this pace cannot continue or it would be the year 2022...
(Multi-page thread 1 2)
September 3rd 12 10:26 PM
by [email protected] Go to last post
11 805
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012052 by Sam Wormley[_2_]
http://www.navcen.uscg.gov/gps/geninfo/NANUabbr.htm http://celestrak.com/GPS/NANU/2012/ http://celestrak.com/GPS/status/2012/ NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012052 SUBJ: SVN45 (PRN21) FORECAST OUTAGE SUMMARY JDAY 241/2211 - JDAY 242/0326 1. NANU TYPE: FCSTSUMM NANU NUMBER: 2012052 NANU DTG: 290406Z AUG 2012
August 30th 12 05:48 PM
by Sam Wormley[_2_] Go to last post
0 315
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012051 by Sam Wormley[_2_]
http://www.navcen.uscg.gov/gps/geninfo/NANUabbr.htm http://celestrak.com/GPS/NANU/2012/ http://celestrak.com/GPS/status/2012/ NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2012051 SUBJ: SVN45 (PRN21) FORECAST OUTAGE JDAY 241/2120 - JDAY 242/0920 1. NANU TYPE: FCSTDV NANU NUMBER: 2012051 NANU DTG: 221847Z AUG 2012
August 22nd 12 11:38 PM
by Sam Wormley[_2_] Go to last post
0 330
Viewpoint: Bringing the Sun Down to Earth by Sam Wormley[_2_]
Viewpoint: Bringing the Sun Down to Earth http://physics.aps.org/articles/v5/90 David Alexander, Department of Physics and Astronomy, Rice University, 6100 Main St, Houston, TX 77005, USA Published August 13, 2012 | Physics 5, 90 (2012) | DOI: 10.1103/Physics.5.90 A laboratory analog of solar plasma offers a new tool in the search for the origin of coronal heating. The sun...
August 13th 12 07:20 PM
by Sam Wormley[_2_] Go to last post
0 335
Both Congress and the Pentagon are putting money on the table tobridge the gap created by delays in the development of the new GPS groundsystem. by Sam Wormley[_2_]
Both Congress and the Pentagon are putting money on the table to bridge the gap created by delays in the development of the new GPS ground system. See: http://www.insidegnss.com/node/3160 -- -Sam Wormley
August 10th 12 02:50 AM
by macpacheco Go to last post
2 350
A Look at Small Indoor Location Competitors by Sam Wormley[_2_]
A Look at Small Indoor Location Competitors July 18, 2012 By: Janice Partyka Wireless Pulse, July 2012 http://www.gpsworld.com/wireless/look-small-indoor-location-competitors-13229 Everyone wants a piece of the pie, the upcoming indoor location pie. Big companies and start-ups are engaged, some in research, others having launched solutions. While Wi-Fi is the most common technology,...
August 9th 12 11:24 PM
by Sam Wormley[_2_] Go to last post
0 354
Breaking Down Samsung’s Purchase of CSR by Sam Wormley[_2_]
Breaking Down Samsung’s Purchase of CSR August 8, 2012 By: Kevin Dennehy LBS Insider, August 2012 http://www.gpsworld.com/lbs/breaking-down-samsung-s-purchase-csr-13325 There have not been many earth-shaking acquisitions of companies that have location as a big part of their offerings. However, the recent $310 million acquisition of CSR’s handset connectivity and location business by...
August 9th 12 11:18 PM
by Sam Wormley[_2_] Go to last post
0 383
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