WV Public Employees would protest this.

TerryRC wrote:

(Sam)

TerryRC wrote:One other issue that is mathematically proven you need one point (x) to find your location on a line. You need two points (x,y) to find yourself on a plane. You need three points (x,y,z) to find yourself in a cube. Thus the need for at least three satellites to establish instantaneous position and elevation.

UH, Terry, I noticed you used the word "instantaneous" there in your above sentence.

Ah, Sam, do you want to nitpick again...

Perhaps I should have said "at the speed of RF". I notice you have no problems with my geometry, anyway.

NO, wasn't nitpicking your inclusion of "instantaneous", ...... but in that is was uncalled for, ....... unnecessary, ...... I figured you must have included said as a potential CYA.

TRC, you might not have a problem with your geometry, ....... but it does appear that you have a problem with GPS satellite locations.

The space segment (SS) comprises the orbiting GPS satellites, or Space Vehicles (SV) in GPS parlance. The GPS design originally called for 24 SVs, 8 each in three circular orbital planes,[6] but this was modified to 6 planes with 4 satellites each.[7] The orbital planes are centered on the Earth, not rotating with respect to the distant stars.[8] The six planes have approximately 55° inclination (tilt relative to Earth's equator) and are separated by 60° right ascension of the ascending node (angle along the equator from a reference point to the orbit's intersection).[2] The orbits are arranged so that at least six satellites are always within line of sight from almost everywhere on Earth's surface.[9]

As of September 2007, there are 31 actively broadcasting satellites in the GPS constellation. The additional satellites improve the precision of GPS receiver calculations by providing redundant measurements.
http://en.wikipedia.org/wiki/Global_Positioning_System

Thus Terry baby, iffen a GPS Locator "burps" out a signal, ...... it is highly likely that at the very least 4 satellites will "hear it" .......... and pin-point its location.

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Thus Terry baby, iffen a GPS Locator "burps" out a signal, ...... it is highly likely that at the very least 4 satellites will "hear it" .......... and pin-point its location.

Except the GPS doesn't burp out the signal, the satellites do. Have you ever used one, personally, or are you passing on info from secondary sources?

Hard to catch that signal if there is little horizon (like in a deep valley).

I used the word "instantaneous" before because you can get a point using one satellite and multiple readings but it takes beaucoup time. The satellite can't be geosynchronous, however, and the GPS unit can't move until it takes multiple readings. Most GPS units are not set up to do this for multiple reasons including accuracy and the fact that it is time-consuming.

TerryRC wrote:Thus Terry baby, iffen a GPS Locator "burps" out a signal, ...... it is highly likely that at the very least 4 satellites will "hear it" .......... and pin-point its location.

Except the GPS doesn't burp out the signal, the satellites do. Have you ever used one, personally, or are you passing on info from secondary sources?

Hard to catch that signal if there is little horizon (like in a deep valley).

Cease with your CYA bullshidt, TRC.

If ....... "The orbits are arranged so that at least six satellites are always within line of sight from almost everywhere on Earth's surface", it matters little which direction the signal is being transmitted. If a GPS unit can receive one (1) signal it can receive all six (6), whether it can decode all 6 or not.

And just because your CHEAPY GPS unit doesn't "burp" out a signal whereby those satellites can "pinpoint" its location ........ doesn't mean that that is an impossible feat.

TerryRC wrote:I used the word "instantaneous" before because you can get a point using one satellite and multiple readings but it takes beaucoup time. The satellite can't be geosynchronous, however, and the GPS unit can't move until it takes multiple readings. Most GPS units are not set up to do this for multiple reasons including accuracy and the fact that it is time-consuming.

AH SO, now you decided to un-lie it, huh?

I knew that was nothing more than a CYA insertion.

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Sam, so you admit that the GPS units don't burp out the signal? What good would it do even if it could?

I have yet to see you man up and admit that you made a mistake.

Sidetrack us again, like you did with Jules Verne when I pointed out that Clarke didn't invent the comm satellite.

I knew I shouldn't bother to explain why I used the word "instantaneous".

It wasn't a CYA as I explained that most (or all) GPS units are not set to use one satellite with multiple readings.

TerryRC wrote:Sam, so you admit that the GPS units don't burp out the signal? What good would it do even if it could?

I have yet to see you man up and admit that you made a mistake.

TRC, you are just proving that you are a typical devious dishonest state employee who will always blame their ignorance and stupidity on someone else. You admitted YOUR GPS couldn't do said, ........ but I made no such admission.

TerryRC wrote:Sidetrack us again, like you did with Jules Verne when I pointed out that Clarke didn't invent the comm satellite.

TRC, you point out a lot of things, ....... most of which are devious and intentional misinterpretation of what was actually stated.

TerryRC wrote:I knew I shouldn't bother to explain why I used the word "instantaneous".

It wasn't a CYA as I explained that most (or all) GPS units are not set to use one satellite with multiple readings.

AH SO, I see you must have done some "reading up" on that after I queried your arse about your use of the word "instantaneous".

Whaja figure out during your "reading up", big boy, .......... that some satellites can take multiple readings of one (1) signal at different locations on its antennae(s) ...... and execute a triangulation to locate the signal source?

Just PFM, ....... BIG BOY, ........... just PFM.

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Whaja figure out during your "reading up", big boy, .......... that some satellites can take multiple readings of one (1) signal at different locations on its antennae(s) ...... and execute a triangulation to locate the signal source

The satellites don't take readings, Sam. The GPS unit does. The satellites send the signals.

You really do not have a clue, do you, Sam.

Most people find it hard to debate when they aren't informed on the subject. Not you, though.

Regardless, the root of the thread was that WV employees would protest a tracking system. I said that I wouldn't, provided it works for me accurately in the field.

TerryRC wrote:Whaja figure out during your "reading up", big boy, .......... that some satellites can take multiple readings of one (1) signal at different locations on its antennae(s) ...... and execute a triangulation to locate the signal source

The satellites don't take readings, Sam. The GPS unit does. The satellites send the signals.

You really do not have a clue, do you, Sam.

Well TRC, maybe you better tell these people they don't have a clue either.

GPS Fleet Management and Tracking


Onstar




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