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rick merritt
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So many sats and more
rick merritt   12/9/2013 1:19:56 PM
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So we have something like four satellite constellations to track now, plus all the indoor techniques. Holy location!

junko.yoshida
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Re: So many sats and more
junko.yoshida   12/9/2013 1:59:44 PM
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Indeed. Further, to my surprise, not all GNSS chips look at all the satellites simultaneously.

krisi
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Re: So many sats and more
krisi   12/9/2013 2:08:04 PM
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Can we make a chip that looks at all satellite signals? That would solve all setellite allocation problems! (tongue firmly in chip, I do realize this is probably amazing complicated)...Kris

Darius Pl.
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Re: So many sats and more
Darius Pl.   12/13/2013 2:50:51 PM
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The professional GNSS Receivers always could do more than the cheap consumer receiver. But this comes at a price. Here is description of one recent version of such professional chip: http://www.amerisurv.com/content/view/12038/

Darius Pl.
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Re: So many sats and more
Darius Pl.   12/13/2013 2:55:59 PM
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If anyone is interested here is a description of the older version of the chip.

http://www.allsat.de/download/Produkte/JAVAD/TRIUMPH.pdf

krisi
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Re: So many sats and more
krisi   12/13/2013 3:27:24 PM
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thank you Darius...ho wmuch price premium one would have to pay for increased functionality? Kris

Darius Pl.
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Re: So many sats and more
Darius Pl.   12/13/2013 3:36:24 PM
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I think the saw the internal price of 17$ per chip (I guess this just the chip manufacturing cost) for the first version of the chip.

A professional receiver like this depending on options can easily cost in range from 10 to 15k$.

I think one of the cheapest dual frequency GPS receivers costs about 5k$.

And if you want to do cm/mm level measurements without paying for an RTK service, then you will need to buy a set of of at least two such receivers!

krisi
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Re: So many sats and more
krisi   12/13/2013 3:40:49 PM
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$17 per chip is on a high side...but not outrageously expensive

green_is_now
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Re: So many sats and more
green_is_now   1/23/2014 2:47:40 PM
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Ok

all this is great till you ask:

whats the battery draw for this accuracy?

These singnals are so small advanced DSP techniques are needed to extract the signal out of the noise floor.

 

The most important question the comes to mind is

With even the most advanced techniques known at this time, even prototype level and theoretical as well, how much power can be saved by reducing power tx and rx from tower and cell phone.

Will this improved efficiency pay for the overhead power of increased positioning prosessing?

1)At present cell tower densities.

2)At some significantly denser level of celltower coverage, perhaps at a picocell level and also inside building of a picocell.

Anybody got any data points or rules of thumb for this.

Ideally a power saving ratio for each of above would be very informative.

Editors, who could answer this?

rick merritt
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Good timing
rick merritt   12/9/2013 8:55:40 PM
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Qcomm's annoucement today of plans for chip sets enabling midrange LTE handsets highlights just how heady their air war is these days.



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