I have a problem with sensor GPS of Broadcom. My device is a Tablet Latitude 10 Dell
I use the software Sensor Diagnostic Tool that test operation of GPS, but i receive message The pipe is closed (exception HResult: 0x800700E8)
See the image. Someone Have this problem?![enter image description here][1]
http://imageshack.us/f/5/24mv.png/
Hmmm... This is a sign that the GPS can't get a fix on your location. So it could be that you are not in a good location for getting a GPS satellite signal? A possible work-around is to turn on the option of determining your location via wireless tower triangulation. Have you tried that?
Related
Is there any way to detect that an external GPS unit is connected to an iOS device (say running iOS 13)?
We're building a special-purpose app that really needs an external GPS to work well, and want to warn the user about accuracy issues if only the internal GPS is available.
(Of course, we could wait until inaccuracies occur, but by that time it's sort of too late.)
the only way I've been able to do it is to compute position updates per second. the internal gps is 1hz. The external gps that I connect to (garmin glo) is 10hz.
If anyone has a better solution I would like to know.
I was wondering if we can get the source type of the current location in iOS. I didn't find any reference nor in CLLocationManager neither in CLLocation.
I've found the same question here in SO, but for Android:
Is it possible to know my location came from gps or glonass?
Android. How to know if location detected is from GPS or Network provider
The second one has an answer that says if the accuracy is smaller than 30 meters, than it is using GPS. But I don't know if we really can assume that.
Is it possible to actually determine with any degree of certainty whether an iPAD actually has a GPS signal. I can think of three cases
Wifi-Only IPAD
Wifi-Only IPAD with External GPS (such as the DualXGPS)
Cellular IPAD with Internal GPS
Apple documentation mentions:
Some location services require the presence of specific hardware on
the given device. For example, heading information is available only
for devices that contain a hardware compass. This class defines
several methods that you can use to determine which services are
currently available.
Are there specific calls that work specifically with a GPS only such as heading or tracking? I'm assuming perhaps only GPS devices have a heading call because the documentation says:
In iOS, a device with the appropriate hardware may also report heading
information. When the value in the headingAvailable property is YES,
you can use a location manager object to retrieve heading information.
Some previous posts suggested trying to get a lock on a very accurate GPS update
Detect if Device has GPS
How can I tell if an iOS device has a GPS?
but i was hoping for something a little more concrete these methods "feel" wishy-washy - because just because an inaccurate GPS signal would likely look like there is no GPS when the device actually has the capability. Also I would think a wifi device which can "mimic-gps" might also some how pass one of these conditions.
Thanks for any help!
The simplest answer is that you should try to use the GPS at the accuracy you need and see if you get it. And deal with the fact that you might not get this accuracy because the user is in a building, or an urban canyon, or doesn't have GPS hardware, or has turned off location services (although this can be detected).
If you get better than 100m accuracy or if the CLLocation has altitude you almost certainly have GPS hardware (but you have to wait quite some time to get a signal lock on at least 4 satellites to get altitude). If you have a cellular radio connection (see Reachability) then you have GPS hardware (except iPhone1). If you have digital compass capability then you have GPS hardware (except iPhone 3G).
Internal GPS hardware is available on all iPhone and iPad that have cellular radios (except iPhone 1, see wiki chart). If you study that chart it appears that all devices (so far) that have GPS hardware also have digital compass (magnetometer) except iPhone 3G.
Using course (as suggested here) from the CLLocation only works if the device is moving fast enough and the GPS has satellite lock. A better option would be to detect if you have a heading from the compass (magnetometer).
You can use the hardware string to determine device capabilities by hardcoding a table of what hardware has what capabilities (described here). This has to be kept updated (which means an app update) when new devices are introduced. Erica Sadun has categories for UIDevice called Capabilities and Hardware on github that attempts this, but may not be usable in the app store.
None of this will help with external plug-in GPS or external bluetooth GPS devices.
if (location.getHoricontalAccuracy()< 40) {
// for sure GPS
} else {
// no GPS or unusable bad GPS
}
you can also use speed and course, if they are valid, then they are from GPS, because It is the only sensor that can measure speed and course. (magentometer shows the current heading, which works without GPS)
Is it possible to get longitude and latitude info while there is neither a cellular nor a WiFi connection?
An Apple person said on the dev forums: "All iOS devices with 3G radios have real, true, honest-to-goodness, satellite communicating GPS (this includes all iPhones except the first one, as well as all iPads with 3G)."
Which means that Core Location will return a Location object with latitude and longitude without accessing the internet over wifi or cell phone, because there is a GPS receiver onboard. Attempting to show a map with MapKit will need an internet connection to get the map tiles of course. But just getting the lat/long can be done.
iOS location API kind of isolates you from source of the location (GPS/3G/Wifi whatever). What you get is coordinates, accuracy, timestamp and others. As you initialize location API you might get old coordinates. You'll need to check the timestamp if they are too old to be useful for you. This can get you last known location which is useful. If there is no Wifi or 3G and you only depend on GPS, it won't work indoors most of the times!
Is it possible to get GPS information in a mobile device through APIs without having any GPRS connectivity?
Edited
Yes, for example on the Java ME platform or Apple iPhone
Yes; if you are on a device that has GPS hardware in it and software development on the device gives you access to that hardware from your software.
This can be using a built in API for opening a COM port. You then just need to open the port that has the GPS hardware connected to (internal GPS receivers inside the device are often connected to a fixed COM port number) start interpreting the (often) NMEA strings that the GPS receiver is sending out.
Or perhaps the device has more specific GPS related APIs, like the GPS intermediate driver in Windows Mobile 5+ that lets the OS talk to any GPS receiver (either built in, or connected via cable or bluetooth to a COM port) and lets multiple applications concurrently interact with the GPS data.
P.S.
GPS has nothing to do with GPRS per se. You might have gotten that idea because of A-GPS which uses telecom network information and/or a dataconnection (like GPRS, EDGE, UMTS, WLAN, whatever) to download a small file with information about the location of GPS satellites.
This data will then enable your device shorter GPS aquisition times within the time period that this retrieved data is current - often a couple of days to a week I believe - because it does not just need to see what GPS signals it can receive and make sense of that, but it has a lot of prior knowledge about the GPS constellation that should be in orbit in the part of the sky you can see.
GPRS is a two-way data transmission which enables you to access the iternet while the GPS is just a receiver and as peSHIr already mentioned it has nothing to do with GPRS. GPS receiver receives the signals from multiple satellites and calculates the location from time differences.
Anyway... you need GPRS or any other internet connection only if you want to use any web service for reverse geolocation or you want to use google maps or any other location service. But just for receiving (calculating) the coordinates GPS by itself is enough.