Welcome guest, is this your first visit? Click the "Create Account" button now to join.
Results 1 to 8 of 8
  1. #1
    Junior Member
    Join Date
    Jan 2015
    Location
    Malaysia
    Posts
    4
    Rep Power
    0

    Default Technical questions about GPS

    As titled above, giving an example can GPS locates a people moving from a table to another in a canteen.

    And can GPS actually works on like a stadium which has roof but not completely isolated?

    Did the maps on GPS is depend on the creator of the system/apps want to insert it or not?

  2.    Advertissements


  3. #2
    ☼ADMIN☼
    catymag's Avatar
    Join Date
    Nov 2007
    Location
    light side
    Posts
    23,565
    Rep Power
    5311

    Default

    GPS signals are carried through waves at a frequency that does not move easily through solid objects. A GPS device relies on a series of satellites in order to determine where it is physically located. The signals sent from these satellites do not penetrate all kinds of barriers with ease. When you use a GPS inside a building, a wide variety of physical barriers and potential interference sources make it difficult for the device to pinpoint your location accurately.
    A GPS works better when the device has a clear line of sight to the sky. The more GPS satellites that your personal device can access, the more accurate it is. When inside, there is often no direct line from the satellite signals to your device. The signal weakens or distorts as it travels through the building to your GPS, and the result is inaccurate operation.
    The construction materials in a building affect how well a consumer GPS device will work inside. If you're in a house and stand near enough to the windows, or if you're in an office tower with large windows, your GPS could still work. GPS signals pass through glass much more easily than they do through thick, solid materials such as brick, metal, stone or wood.

    Today's GPS receivers are extremely accurate, thanks to their parallel multi-channel design.
    12 parallel channel receivers are quick to lock onto satellites when first turned on and they maintain strong locks, even in dense foliage or urban settings with tall buildings. Certain atmospheric factors and other sources of error can affect the accuracy of GPS receivers. Newer Garmin GPS receivers with WAAS (Wide Area Augmentation System) capability can improve accuracy to less than three meters on average. No additional equipment or fees are required to take advantage of WAAS. Users can also get better accuracy with Differential GPS (DGPS), which corrects GPS signals to within an average of three to five meters.
    Older GPS receivers are accurate to within 15 meters on average.

    The next generation of positioning technology is being designed to overcome the limitations of GPS. While GPS devices don't work particularly well indoors, IPS (Indoor Positioning System) technologies are being developed by companies like Google, Microsoft and Nokia to offer pinpoint location accuracy even while users are inside. These technologies utilize different types of signals to triangulate the position of the user while indoors. Wi-Fi hot spots, Bluetooth signals and cellphone signals have all been experimented with by the various companies refining this technology


    sources:
    Code:
    Please Login or Register to see the links
    Code:
    Please Login or Register to see the links
    Code:
    Please Login or Register to see the links
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

  4. #3
    Junior Member
    Join Date
    Jan 2015
    Location
    Malaysia
    Posts
    4
    Rep Power
    0

    Default

    You didn't actually answered all of my questions, but somehow i managed to get it.
    The last question i would say in other word, if i created an application wished to track someone location in the college, then i have to insert the map of the campus on my own?

  5. #4
    Garmin/GPS Systems GMod.

    Neil's Avatar
    Join Date
    Aug 2011
    Location
    Oz.
    Posts
    7,387
    Rep Power
    1434

    Default

    It seems you'll need a gps/gprs/gsm tracking device if you wish to track someone's location like that indoors/on a college campus. A standard GPS navigation device such as a Garmin or TomTom PND can't do what you're wanting. Maybe you should check the 'stalker' and privacy laws in your country before proceeding. If you place such a device on their person or in their possessions such as a handbag without lawful reason or without their knowledge then you may be breaking the law depending on who the person is and their relationship to you. Placing a tracking device in your own 8 year old child's schoolbag may not be a problem even without his or her knowledge or permission, but covertly tracking an unrelated college student probably would be.

    I doubt that you'll get any meaningful help here for tracking anyone like you want.
    'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
    Please don't spam. Posts serving no purpose other than to thank or to ask about hidden links are trashed or deleted, it's GPSPower's policy. Please don't spam.
    [Only registered and activated users can see links. ] should make their first post as a new Intro Thread in [Only registered and activated users can see links. ].

  6. #5
    Junior Member
    Join Date
    Jan 2015
    Location
    Malaysia
    Posts
    4
    Rep Power
    0

    Default

    Quote Originally Posted by Neil View Post
    It seems you'll need a gps/gprs/gsm tracking device if you wish to track someone's location like that indoors/on a college campus. A standard GPS navigation device such as a Garmin or TomTom PND can't do what you're wanting. Maybe you should check the 'stalker' and privacy laws in your country before proceeding. If you place such a device on their person or in their possessions such as a handbag without lawful reason or without their knowledge then you may be breaking the law depending on who the person is and their relationship to you. Placing a tracking device in your own 8 year old child's schoolbag may not be a problem even without his or her knowledge or permission, but covertly tracking an unrelated college student probably would be.

    I doubt that you'll get any meaningful help here for tracking anyone like you want.
    You misunderstood me. I tend to designing an social college apps which including locations of the students. By the way, i appreciate your reply with much sincere.

  7. #6
    ☼ADMIN☼
    catymag's Avatar
    Join Date
    Nov 2007
    Location
    light side
    Posts
    23,565
    Rep Power
    5311

    Default

    I think there are apps like the one you are thinking about
    Code:
    Please Login or Register to see the links
    for example
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

  8. #7
    Garmin/GPS Systems GMod.

    Neil's Avatar
    Join Date
    Aug 2011
    Location
    Oz.
    Posts
    7,387
    Rep Power
    1434

    Default

    Quote Originally Posted by Neil View Post
    ............
    I doubt that you'll get any meaningful help here for tracking anyone like you want.
    Quote Originally Posted by Ricky239 View Post
    You misunderstood me. I tend to designing an social college apps which including locations of the students. By the way, i appreciate your reply with much sincere.
    Yes I certainly did misunderstand your intentions and rather badly. My apologies and thanks for your polite understanding. Maybe catymag has now also misunderstood you but in a lesser and kinder way , whereas before i think she was on the 'right track' because the apps she mentioned above [and others such as loci etc] i suspect will not give you the super-fine location 'pin-point' accuracy of 'people moving from a table to another in a canteen'. The lead she gave you earlier for Indoor Positioning is probably more to your needs. Afaik, those IPSs can rely on one or more methods of 'triangulation' such as limited-strength wireless networks [WLAN and BT], mobile tower network signals [GSM, 3G, 4G], magnetic and inertial [INS] for fine location and tracking as well as GNSS [GPS etc] and including GPRS, AGPS, DGPS for coarse location.

    I now think you are wanting to design and build your own software application for this purpose and want to use GPS-type tracking as the principal indoor location method. Even making use of a SBAS [commonly know as 'WAAS' worldwide but actually usable only in NA] will not give you the fine locating you desire, and in any case i don't think any of those current systems such as WAAS, EGNOS, MSAS etc are usable in Malaysia and regardless the best available will only give about 3 metre accuracy anyway outdoors. Local Area Augmentation Systems [LAAS] involves dedicated fixed ground stations 'correcting' GPS signal errors and distortions but are primarily used for aircraft landing system instrument approaches [IFR] and give better positioning where a large discrepancy is intolerable, particularly vertically]. In short, I don't think any or all GNSS [GPS, GLOSNAS and/or upcoming Gallileo, BeiDou etc] even if enhansed with SBAS/LAAS will be anywhere near sufficient for your purposes, especially indoors when used solely.

    So, because you are only looking to locate and track ppl in the confined local situation of your college campus, I think you should look to IPS for your primary location/tracking method as first suggested by catymag. Here's other couple of links:
    Code:
    Please Login or Register to see the links
    As for your campus floor plan, maybe you could get access to the original building plans/site plans or even look to Google maps who are now creating maps for shopping malls and other large public complexes for use with their own IPS. Nokia are also into the act with a BT 4.0 based method of ppl navigating their way around shopping malls and large buildings such as IKEA megastores. If those giants succeed to make it workable quickly and extend it to all public buildings and complexes and also include 'opt-in' tracking, your intended self-developed campus-specific app might be redundant quite quickly perhaps.
    Last edited by Neil; 7th January 2015 at 00:36.
    'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
    Please don't spam. Posts serving no purpose other than to thank or to ask about hidden links are trashed or deleted, it's GPSPower's policy. Please don't spam.
    [Only registered and activated users can see links. ] should make their first post as a new Intro Thread in [Only registered and activated users can see links. ].

  9. #8
    Junior Member
    Join Date
    Jan 2015
    Location
    Malaysia
    Posts
    4
    Rep Power
    0

    Default

    Quote Originally Posted by Neil View Post
    Yes I certainly did misunderstand your intentions and rather badly. My apologies and thanks for your polite understanding. Maybe catymag has now also misunderstood you but in a lesser and kinder way , whereas before i think she was on the 'right track' because the apps she mentioned above [and others such as loci etc] i suspect will not give you the super-fine location 'pin-point' accuracy of 'people moving from a table to another in a canteen'. The lead she gave you earlier for Indoor Positioning is probably more to your needs. Afaik, those IPSs can rely on one or more methods of 'triangulation' such as limited-strength wireless networks [WLAN and BT], mobile tower network signals [GSM, 3G, 4G], magnetic and inertial [INS] for fine location and tracking as well as GNSS [GPS etc] and including GPRS, AGPS, DGPS for coarse location.

    I now think you are wanting to design and build your own software application for this purpose and want to use GPS-type tracking as the principal indoor location method. Even making use of a SBAS [commonly know as 'WAAS' worldwide but actually usable only in NA] will not give you the fine locating you desire, and in any case i don't think any of those current systems such as WAAS, EGNOS, MSAS etc are usable in Malaysia and regardless the best available will only give about 3 metre accuracy anyway outdoors. Local Area Augmentation Systems [LAAS] involves dedicated fixed ground stations 'correcting' GPS signal errors and distortions but are primarily used for aircraft landing system instrument approaches [IFR] and give better positioning where a large discrepancy is intolerable, particularly vertically]. In short, I don't think any or all GNSS [GPS, GLOSNAS and/or upcoming Gallileo, BeiDou etc] even if enhansed with SBAS/LAAS will be anywhere near sufficient for your purposes, especially indoors when used solely.

    So, because you are only looking to locate and track ppl in the confined local situation of your college campus, I think you should look to IPS for your primary location/tracking method as first suggested by catymag. Here's other couple of links:
    Code:
    Please Login or Register to see the links
    As for your campus floor plan, maybe you could get access to the original building plans/site plans or even look to Google maps who are now creating maps for shopping malls and other large public complexes for use with their own IPS. Nokia are also into the act with a BT 4.0 based method of ppl navigating their way around shopping malls and large buildings such as IKEA megastores. If those giants succeed to make it workable quickly and extend it to all public buildings and complexes and also include 'opt-in' tracking, your intended self-developed campus-specific app might be redundant quite quickly perhaps.
    Yeah thanks again for the explanation. I'd been into IPS to know more and consider about it before i posted here but i doubt that the IPS is currently mature enough for commercial uses. Somehow its too bad but i knew that the giants are into these far more earlier than i am but its alright because the pinpoint location tracking is just one part of my intended self-developed-campus-specific app, it might be different from what the giants developed so i would go for it on a try.

    And i have another questions for that. The link you quoted to me states that Broadcom invented a chip to support IPS for mobile, and i wanted to ask that why is that chip invented for? What is the support they are mentioning for mobile technology which i didn't know. Thanks again.
    Last edited by Ricky239; 7th January 2015 at 14:17.

 

 

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.