AirTalk.org

dolla@bill.com · Guest

free how-GPSs-work program available:

http://homepages.nyu.edu/~pashre01/down.htm @ the bottom of the page.

enjoy.

Robert L. Bass · Guest

Now, why should we download an unknown zip file from this website on a
recommendation from someone that hasn't posted here before???

Any takers?

<dolla (AT) bill (DOT) com> wrote

BTIZ · Guest

very good catch... even if it does say nyu.edu.. it is still in a personal
folder
BT

"Robert L. Bass" <Yeah (AT) right (DOT) inter.com> wrote

Jim · Guest

Not me, I thought the exact same thing.
--
Jim Burns III
[email]jburns3 (AT) nospamuniontel (DOT) net[/email]
Remove "nospam" to reply

"Robert L. Bass" <Yeah (AT) right (DOT) inter.com> wrote

Brooks Hagenow · Guest

Yes. I got curious even though it screamed virus/trojan.

I downloaded and examined it on my Linux box. It is a Java program like the
webpage suggests. Got a little worried when I saw unzipped the file only to
find shell scripts as well as batch files. I started to think I may have
just unleashed skynet loose on the Internet.

But it looks safe to me although I haven't actually run it and wonder why
there are elements used for conecting to Oracle databases packaged with it.
I would like to know what that is about before I run it myself. All the
scripts were auto-generated by JDeveloper and the guy obviously has no idea
how to package and deploy java applications as jar files. He has batch
files and shell scripts to setup the environment so that the application can
run even though that could be more easily taken care of by properly creating
a manifest file in a jar file and run it with "java -jar Tree". There was a
jar file inside the zip file called Tree.jar and the manifest file was
auto-generated just like the batch files and shell scripts by JDeveloper.

Except for the possibility he is connecting to an Oracle database over the
net for some unknown reason I am not worried about it. I suspect it may be
left over from a previous school project that got bundled with this one.
But I also am not interested enough to run it myself. I was just interested
in what the zip file really was.

"Robert L. Bass" <Yeah (AT) right (DOT) inter.com> wrote

Paul · Guest

Looks like you downloaded the wrong one Smile

The one he was on about was the GPS program at the bottom called novagps
(not sure what the java one was at the top, something about self
improvement!!!)

Anyhow, I tried the GPS one and it is safe (and basic). I think it may be
inaccurate as it explains how two satellites generate a probably location of
the receiver within a circle (ovalish) shape where the two circumferences of
the satellite time/distance intersect, I thought with two satellites you get
two possible points precisely where the two circles intersect. and the third
satellite pinpoint the correct intersection?

Maybe it taught me something?

"Brooks Hagenow" <someone (AT) microsoft (DOT) com> wrote

Jerry Petrey · Guest

Paul wrote:

Tim Hogard · Guest

Paul (p_p (AT) hotmail (DOT) com) wrote:
:
: Anyhow, I tried the GPS one and it is safe (and basic). I think it may be
: inaccurate as it explains how two satellites generate a probably location of
: the receiver within a circle (ovalish) shape where the two circumferences of
: the satellite time/distance intersect, I thought with two satellites you get
: two possible points precisely where the two circles intersect. and the third
: satellite pinpoint the correct intersection?

Almost...
If you have two sats above each pole and you assume your at sea
level you could be anywhere on the equator. In the real world where
the sats don't go over the poles, you end up solving for exactly
two points if you assume sealevel (or any other last known altitude).

A third sat will reduce the solution to a point and if you make
assumptions about altitude or speed or time, you can solve for most
of the others. If you do that for a few seconds you can verify
that your time guess is right and get a good 3d position fix with
time and keep it. The timing GPS units that are used for mobile
phone base stations make use of that by assuming they aren't moving
and they can do very nice time signals based on just one sat.

If you want more info, search for "Kalman filter". its a mathematical
way of taking several inputs (altitude, direction, speed, delta-v,
lat, long, time, range to sat 2, range to sat 34, etc) and guessing
where your at and and where your going if some of thouse input
values stop for a short time.

-tim
http://web.abnormal.com