PNT Advisory Board Meeting, 9-10 Nov 2011

National Space-Based Positioning, Navigation, and Timing (PNT)
Advisory Board Agenda
Ninth Meeting, November 9-10, 2011

http://www.pnt.gov/advisory/2011/11/

FAA Alternative PNT study (DME, ADS-B, pseudolites):

http://www.pnt.gov/advisory/2011/11/eldredge.pdf

Considerations for Constellation Sustainment:

http://www.pnt.gov/advisory/2011/11/lewis1.pdf

Discussion of a standard certification process for GPS receivers:

http://www.pnt.gov/advisory/2011/11/mcneff.pdf

Some examples of designing more robust receivers:

http://www.pnt.gov/advisory/2011/11/scott.pdf

Several briefings on LightSquared issues. Javad Ashjaee goes into
great detail (e.g., cost figures on Slide 30):

http://www.pnt.gov/advisory/2011/11/ashjaee.pdf

Garmin rebuts -- concise summary on Slide 4:

http://www.pnt.gov/advisory/2011/11/burgett.pdf

On 2011-11-11 12:16 , Ed M. wrote:

Thanks for the list.


Not exactly an impartial presenter.

And of course it completely ignores:

1. - Cost of retrofit in aviation systems.
- Cost of re-certification of receivers AND nav systems
that use them. [as also stated in the Garmin presentation below]
- the use of some receivers (esp. ground stations) of the entire
spread spectrum.

2. Costs to replace equipment in other domains including telecoms,
marine, differential systems, survey and so on.



--
gmail originated posts filtered due to spam.

There's been much said concerning GPS alternatives for aviation. But
what about GPS and maritime applications?

Automatic Identification System (AIS) is increasing in importance for
managing busy waterways and port facilities. Electronic charting
systems are becoming the norm .. to the chagrin of all those 'Old
salts'. Those alternative PNT concepts aren't much help.

What current alternative precision radionavigation is available for
mariners? LORAN could get you close so it was OK in littoral
zones .. it's gone. Radar is useful .. that's about it.

I wonder what ships far out at sea would do today without GPS. I'd
suppose large ships equipped with inertial systems can navigate fairly
well for a few days.

Nobody knows much about celestial these days although that might be
one's only option on the blue water.

Oh, I do have an old radio direction finder somewhere in the basement.

--- CHAS

On 2011-11-13 14:19 , HIPAR wrote:

GLONASS, Galileo, Compass ...


They did fine with VLF/Omega navigation. You don't need great precision
(VLF/Omega gave 1 - 4 NM accuracy, generally). Many airlines used it as
well. (dual INS + 1 Omega or dual Omega + 1 INS). VLF/Omege was
decommissioned in the late 90's.

Ships also used TRANSIT - a predecessor satellite system to GPS.


I thought it was still required, at least to get a master mariner's
license (?)


Aircraft still use them (ADF) and VOR can be used as a DF, esp. in an
Radio Magnetic Indicator (RMI) configuration - not that I've seen an RMI
in 20 years or so. (An RMI has a compass card slaved to the mag compass
or INS mag heading output, and usually two needles, one pointing to the
ADF and the other selectable to VOR 1 or 2. Rather than showing course
deviation from a selected radial, it would simply point towards the VOR).

--
gmail originated posts filtered due to spam.

George Kaplan was formerly the director of the Astronomical
Applications (AA) department at USNO. He posts a lot of celestial
navigation information here:

http://gkaplan.us/

http://gkaplan.us/content/nav_algorithms.html

http://gkaplan.us/content/NewTech.html

This appears to be the product that Kaplan describes on his main page:

http://trexenterprises.com/Products%20and%20Services/Sensors/opticalgps.htm=
l

More pubs at USNO/AA:

http://aa.usno.navy.mil/publications/docs/reports.php

http://aa.usno.navy.mil/publications/reports/GK_posmo.pdf

Bowditch (2002 edition) can be downloaded a chapter at a time thru the
dropdown menu here:

http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=3Dtrue&_pageLabel=3Dmsi_porta=
l_page_62&pubCode=3D0002

Another interesting site:

http://www.celestialnavigation.net/

http://www.celestialnavigation.net/practice.html