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#21
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GNS430 on the Airway
Matt Barrow wrote:
"Peter R." wrote in message ... Hmmm...how are they going to route traffic when all the VOR's are decommissioned in the next few years? Who told you that? |
#22
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GNS430 on the Airway
wrote... Matt Barrow wrote: Hmmm...how are they going to route traffic when all the VOR's are decommissioned in the next few years? Who told you that? http://www.faa.gov/asd/gpstrans.pdf http://avnwww.jccbi.gov/icasc/PDF/frp1999.pdf http://www.alaska.faa.gov/capstone/d...de%20v1.1H.pdf |
#23
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GNS430 on the Airway
"Ted" wrote in message et... wrote... Matt Barrow wrote: Hmmm...how are they going to route traffic when all the VOR's are decommissioned in the next few years? Who told you that? http://www.faa.gov/asd/gpstrans.pdf http://avnwww.jccbi.gov/icasc/PDF/frp1999.pdf http://www.alaska.faa.gov/capstone/d...de%20v1.1H.pdf also see: http://gps.faa.gov/ http://www.navcen.uscg.gov/cgsic/mee...ons/Hanlon.ppt |
#24
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GNS430 on the Airway
"Ted" wrote:
wrote... Matt Barrow wrote: Hmmm...how are they going to route traffic when all the VOR's are decommissioned in the next few years? Who told you that? http://www.faa.gov/asd/gpstrans.pdf http://avnwww.jccbi.gov/icasc/PDF/frp1999.pdf http://www.alaska.faa.gov/capstone/d...de%20v1.1H.pdf Don't use outdated FRPs. The FAAs OLD thought of getting rid of all ground-based navaids in favor of SATNAV was flawed from the beginning. It was further reduced to outdated after 9/11. Ron Lee |
#25
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GNS430 on the Airway
"Marco Leon" mmleon(at)yahoo.com wrote:
So how far off an airway is an aircraft when they are following a GPS flight plan with every intersection and VOR? Is there an article or study somewhere that includes metrics to back it up? For example, "a non-WAAS GPS-derived line direct btween two intersection xx miles away will differ from the airway between those same two intersections by x.x statute miles." How do the error allowances play into this? Since unaugmented GPS (not using WAAS) is accurate to 10 meters or so (plus/minus) and an airway is plus/minus four MILES (or is is two?) the navigation source (GPS) is not a major error source. Ron Lee |
#26
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GNS430 on the Airway
On 02/09/06 08:09, Ron Lee wrote:
"Marco Leon" mmleon(at)yahoo.com wrote: So how far off an airway is an aircraft when they are following a GPS flight plan with every intersection and VOR? Is there an article or study somewhere that includes metrics to back it up? For example, "a non-WAAS GPS-derived line direct btween two intersection xx miles away will differ from the airway between those same two intersections by x.x statute miles." How do the error allowances play into this? Since unaugmented GPS (not using WAAS) is accurate to 10 meters or so (plus/minus) and an airway is plus/minus four MILES (or is is two?) the navigation source (GPS) is not a major error source. An airway is 8 miles wide (4 miles on either side of the centerline). One of the problems is that GPS accounts for magnetic variations differently than the VORs do. Also I don't think GPS accounts for the fact that the VOR radial are not exactly aligned with magnetic north (what is this called? variance? I can't remember - it's documented in the A/FD). GPS position errors would be on top of all this. Ron Lee -- Mark Hansen, PP-ASEL, Instrument Airplane Cal Aggie Flying Farmers Sacramento, CA |
#27
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GNS430 on the Airway
Mark Hansen wrote:
One of the problems is that GPS accounts for magnetic variations differently than the VORs do. Also I don't think GPS accounts for the fact that the VOR radial are not exactly aligned with magnetic north (what is this called? variance? I can't remember - it's documented in the A/FD). This would have an effect only if the procedure has you tracking a defined VOR radial. There might be some such procedures, but I can't think of any at the moment. All the airway segments (that's what we're talking about, right?) that I know of have a defined point at each end of the segment. There is one and only one great circle route between those two points. It's the same great circle whether you follow it with a GPS or a VOR receiver. Dave |
#28
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GNS430 on the Airway
"Ron Lee" wrote in message ... "Ted" wrote: wrote... Matt Barrow wrote: Hmmm...how are they going to route traffic when all the VOR's are decommissioned in the next few years? Who told you that? http://www.faa.gov/asd/gpstrans.pdf http://avnwww.jccbi.gov/icasc/PDF/frp1999.pdf http://www.alaska.faa.gov/capstone/d...de%20v1.1H.pdf Don't use outdated FRPs. Do you have a newer version? The FAAs OLD thought of getting rid of all ground-based navaids in favor of SATNAV was flawed from the beginning. It was further reduced to outdated after 9/11. How so? |
#29
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GNS430 on the Airway
"Peter R." wrote in message ... Matt Barrow wrote: Hmmm...how are they going to route traffic when all the VOR's are decommissioned in the next few years Next few years? Where did you get this timeframe? See Ted's posts further down the thread. |
#30
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GNS430 on the Airway
Ted wrote:
"Ted" wrote in message et... wrote... Matt Barrow wrote: Hmmm...how are they going to route traffic when all the VOR's are decommissioned in the next few years? Who told you that? http://www.faa.gov/asd/gpstrans.pdf http://avnwww.jccbi.gov/icasc/PDF/frp1999.pdf http://www.alaska.faa.gov/capstone/d...de%20v1.1H.pdf also see: http://gps.faa.gov/ http://www.navcen.uscg.gov/cgsic/mee...ons/Hanlon.ppt The WAAS implementation in that first PDF (10 years old) is terribly out of date. WAAS, although supporting LPV, is not performing as well as they hoped when that was published. There is still no sole-means en route in sight, except for Alaska, which is an exception to the usual ICAO requirements. |
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