gps | 易学教程

DGPS corrections on Android

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问题 I am developing a project that is intended to use the GPS capabilities of an Android phone and a nearby station to compute positioning to a much more precise degree (cm), using RTK DGPS technology. So far, I haven't been able to see anyone saying they actually managed to perform a similar task (apart from @GPSmaster, who doesn't explain how), and the APK doesn't seem to offer any information from the GPS chip other than location and NMEA message updates. I need, if possible, pseudo-ranges and

New Android Geofence Api - Sample code does not alert/notify when at location

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I need some clarity on the sample code supplied with Geofence guide as posted here : https://developer.android.com/training/location/geofencing.html I ran the code and I see that geofences are created correctly, but what I really want is a way to get alerted when I drive to those geofenced locations. Right now, when I go past those geofenced spots, nothing happens (ReceiveTransitionsIntentService does not get called), no notifications nothing. Do I also have to listen to periodic location updates and pass lat/lng to the above piece of code manually to indicate my current location? I thought

GPS library for .NET compact framework

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问题 I'm thinking of writing simple application for Windows Mobile devices, where user could simply enter destination coordinates, and the app would calculate distance and show direction to the destination. But I haven't found any Free , preferably Open Source library with simple API to work with GPS . 回答1: I recently used open source SharpGPS. It's supposed to support more devices than the example in the SDK, but both solutions work on all my hardware. SharpGPS did make it easier to access more

How can I get the GPS raw data (satellites pseudo range)?

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问题 How can I read GPS raw data, to be more specific I need the saellites pseudo range. This data is not available in NMEA format. 回答1: Satellites pseudo-ranges are not available in the official API, neither through the GpsStatus.Listener nor the GpsStatus.NMEAListener interfaces. The only available info available in the GpsSatellite class are: PRN azimuth elevation C/N0 a "usedInFix" boolean. The Android source code asks just those fields from the native code, so no hope to get it from any other

location manager issue for ice cream sandwhich

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can anybody explain me what is this error ? I am getting only for android 4 + and not for below: E/AndroidRuntime(891): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.getaddress/com.example.getaddress.MainActivity}: java.lang.IllegalArgumentException: requested provider network doesn't exisit It appears that the NETWORK_PROVIDER location provider is not accessible in Android 4+ emulators without Google APIs ( well actually I have not tested on all of them ,see below ). The real devices I have tested on are OK with it (but they all have Google services on them,

how to get satellite name or number when we are getting location through GPS in Android?

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I am new in android, I am getting location through gps, I am also getting satellite number in our code but I want to get specific satellite name or number which is used to get the location. I have google so much but not getting proper solution regarding this. My Question is:- 1. It is possible to get a particular satellite name or number ? if yes please help me how to find it ? Thanks in advance locationManager.getGpsStatus(null).getSatellites() (The caller may either pass in a GpsStatus object to set with the latest status information, or pass null to create a new GpsStatus object.) Returns

Foreground service not receiving location updates in Android 7.0+ when screen is off

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I am trying to create an Android application that continuously logs device location data in realtime while the device screen is off. My code works correctly with Android 6.0 and earlier but it seems that Android 7.0+ breaks my app. I have implemented an Android foreground service that uses a wakelock and subscribes to the Google FusedLocation API. Once the screen is turned off the onLocationChanged callback is never triggered. Has anyone seen a solution to this problem? I have tried disabling Battery Optimization through the Android Device Settings for my app as well as for the Google Services

Android GPS location accuracy issue

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问题 I am working on gps tracking apps in android. Here is my code architecture: BackgroundSyncService : A service class that is used for getting location update. Here GoogleApiClient is initialized and implements others Location related methods. AppRunCheckerReceiver : A BroadcastReceiver class that will check if my BackgroundSyncService is running or not in a time interval. If it stopped then it start. GpsEnableReceiver : A BroadcastReceiver it will fire if gps status changed. It will check if

C#: GPS Tracking system [closed]

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问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . How do I go about building a GPS tracking system with mobile (with GPS) in C#.net ? The scenario is Track a user (service engineer, nothing illegal here) via a GPS enabled mobile Phone. What software and hardware will I require? Is there any open source implementation? For a

GPS coordinates: 1km square around a point

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问题 I was hoping someone out there could provide me with an equation to calculate a 1km square (X from a.aaa to b.bbb, Y from c.ccc to c.ccc) around a given point, say lat = 53.38292839 and lon = -6.1843984 ? I'll also need 2km, 5km and 10km squares around a point. I've tried googling around to no avail... It's late at night and was hoping someone might have quick fix handy before I delve into the trigonometry... I'll be running all this in Javascript, although any language is fine. 回答1: If the