[gps-talkusers] Re: gps inside?
- From: "Baracco, Andrew W" <Andrew.Baracco@xxxxxx>
- To: <gps-talkusers@xxxxxxxxxxxxx>
- Date: Mon, 17 Dec 2007 11:36:57 -0800
Your cell phone gets its signal from a land based tower, often mounted
on tall office buildings, etc.
Andy
-----Original Message-----
From: gps-talkusers-bounce@xxxxxxxxxxxxx
[mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Tina B.
Sent: Thursday, December 13, 2007 7:38 PM
To: gps-talkusers@xxxxxxxxxxxxx
Subject: [gps-talkusers] Re: gps inside?
I see. how is it then that your cell phone will work indoors for the
most part when they get everything thru satellites although seems to me
I remember reading that they are really just radios so maybe that is it.
Interesting.
----- Original Message -----
From: "Scott Granados" <gsgranados@xxxxxxxxxxx>
To: <gps-talkusers@xxxxxxxxxxxxx>
Sent: Thursday, December 13, 2007 5:46 PM
Subject: [gps-talkusers] Re: gps inside?
> Tina, just a quick primer on how GPS works to answer your first
question.
> There is a constilation of space based platforms that the defense
> department put up for the purposes of navigation in military
applications.
> This system uses very carefully controled time sources and a receiver
> which measures the deviation of signal received from one of several
> birds that your receiver locks on to at any given time. You need I
> believe it's
> 4 birds at a minimum to have a fix in 3 dimentions. (someone pipe in
> if I'm way off here) So, can you use the GPS inside? Not so well.
> Yes, mine comes on in my house but there's no floors above my position
> and the roof allows some signal to pass. This is not normally the
> case. In most buildings (like where I work for example) the roof and
> materials totally obstruct the signal. In fact, I work in a lab where
> we use GPS signals for very careful timing. We have to pass an
> antenna up through the roof and calebrate it carefully, with the
> position exactly of each sattellite so that we can generate really
> accurate time signals. My point is that you have no signal to work
> with inside a building typically so it's not possible to get a fix,
> something your receiver needs to transmit position data to the Sindero
> package. If you had another means of calculating a fix either with a
> gyroscope or something that can calculate movement until the signal is
> reacquired you might have something but as it stands now I don't think
> it's workable indoors for the most part. I'm sure someone from
Sindero will detail this better but this is my understanding.
>
> Thanks
> Scott
>
>
>
>
> ----- Original Message -----
> From: "Tina B." <tinabir@xxxxxxxxxxxxx>
> To: <gps-talkusers@xxxxxxxxxxxxx>
> Sent: Thursday, December 13, 2007 4:24 PM
> Subject: [gps-talkusers] gps inside?
>
>
>> Hi. Does the braille note gps work indoors yet or is that being
planned?
>> Also, if I get a jump drive for my m-power , can I save the maps for
>> the US on to that drive or what kind of device are they on like a cf
>> card or an sd card? I know you can get those little drives with
>> several gigs have a friend who just got a 3 or 4 gig one so that is
>> what made me wonder and if I can, what gig should I go with just to
>> be sure there is enough space?
>> ----- Original Message -----
>> From: "Raul A. Gallegos" <raul@xxxxxxxxxxx>
>> To: <gps-talkusers@xxxxxxxxxxxxx>
>> Sent: Thursday, December 13, 2007 1:40 PM
>> Subject: [gps-talkusers] Re: BrailleNote GPS vs Voice Sense GPS
>>
>>
>>> Hi. On the Voice Sense I put in Sendero as the virtual position and
>>> the Lighthouse as the destination. It showed that the destination
>>> was 64.37 miles southwest from Sendero.
>>>
>>> The Voice Sense plays progress tones, but I don't think they are
>>> three seconds apart. I created the route using two slightly methods.
>>> The first was using the micro hard drive CF card with the whole West
>>> of the US loaded. The second test was with only the California maps
>>> loaded in the flashdisk of the Voice Sense. In both cases the result
was the same.
>>> Creating a vehicle route took 57 beeps. The route had 364 waypoints.
>>> To be honest, this is longer than what I would have thought. At
>>> least when I've created many routes in Denver, Chicago, and Fort
>>> Wayne, 60 or so mile routes do not seem to take as long, but I don't
>>> know if POIs or map areas have something to do with this.
>>>
>>> So, there is the Voice Sense side of things.
>>>
>>> Kevin Chao said the following on 12/13/2007 1:14 PM:
>>>> If we wwant to figure this out we can run a test. Let's say we just
>>>> have the maps for California loaded and create a route from Sendero
>>>> Group to the LightHouse and see what the difference in speed is.
>>>> Raul, I am not sure if there is some progress tone on the Sense
>>>> Nav. On the Sendero GPS, there is a swoosh that occurs every 3
>>>> seconds to indicate some progress. Starting: Sendero Group
>>>> 11188 Maple Lane Davis, CA Ending: LightHouse
>>>> 214 Van ness Ave San Francisco, CA Could someone perform the route
>>>> calculation on the BrailleNote and someone on the VoiceSense? We
>>>> then can compare notes. It might be faster on the VoiceSense as
>>>> Alex suggested as there is more processing power and RAM on the
VoiceSense.
>>>> There are many variables that aren't accounted for, but this is
>>>> just a general comparison. Kevin -----Original Message-----
>>>> From: gps-talkusers-bounce@xxxxxxxxxxxxx
>>>> [mailto:gps-talkusers-bounce@xxxxxxxxxxxxx] On Behalf Of Judy W
>>>> Sent: Thursday, December 13, 2007 8:58 AM
>>>> To: gps-talkusers@xxxxxxxxxxxxx
>>>> Subject: [gps-talkusers] Re: BrailleNote GPS vs Voice Sense GPS
>>>>
>>>>
>>>> Isn't the chip in the Braille Sense faster? Maybe someone from
>>>> sendero could tell us if route calculation is noticeably faster.
>>>>
>>>> Judy
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: gps-talkusers-bounce@xxxxxxxxxxxxx
>>>> [mailto:gps-talkusers-bounce@xxxxxxxxxxxxx]On Behalf Of Raul A.
>>>> Gallegos
>>>> Sent: Thursday, December 13, 2007 10:47 AM
>>>> To: gps-talkusers@xxxxxxxxxxxxx
>>>> Subject: [gps-talkusers] Re: BrailleNote GPS vs Voice Sense GPS
>>>>
>>>>
>>>> Hello Eric. I'd be happy to comment on the Voice Sense side of
>>>> things although I'm not sure how much my comments will mean since
>>>> I've only used the Voice Sense and not the Braille note. The things
>>>> i can comment on are mainly things which I've seen from reading
>>>> other user experiences, but none from me personally.
>>>>
>>>> Eric Brinkman said the following on 12/13/2007 11:26 AM:
>>>>> Hi,
>>>>>
>>>>> I am curious whether anyone who has used both the BrailleNote GPS
>>>>> and the Voice Sense GPS can comment on any differences between the
two.
>>>>> Thanks in advance.
>>>>>
>>>>> Eric
>>>>
>>>>
>>>> --
>>>> Raul A. Gallegos .. GW Micro Technical Support
>>>> Voice: 260-489-3671 .. Fax: 260-489-2608
>>>> WEB: http://www.gwmicro.com
>>>> FTP: ftp.gwmicro.com
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> --
>>> Raul A. Gallegos .. GW Micro Technical Support
>>> Voice: 260-489-3671 .. Fax: 260-489-2608
>>> WEB: http://www.gwmicro.com
>>> FTP: ftp.gwmicro.com
>>>
>>>
>>
>>
>>
>
>
>
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