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https://github.com/neXenio/BLE-Indoor-Positioning
Multilateration using bluetooth beacons
https://github.com/neXenio/BLE-Indoor-Positioning
beacon bluetooth indoor-positioning java library multilateration trilateration
Last synced: 6 days ago
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Multilateration using bluetooth beacons
- Host: GitHub
- URL: https://github.com/neXenio/BLE-Indoor-Positioning
- Owner: neXenio
- License: apache-2.0
- Created: 2017-11-14T12:16:43.000Z (almost 7 years ago)
- Default Branch: master
- Last Pushed: 2020-07-02T07:48:12.000Z (over 4 years ago)
- Last Synced: 2024-08-02T15:49:33.298Z (3 months ago)
- Topics: beacon, bluetooth, indoor-positioning, java, library, multilateration, trilateration
- Language: Java
- Homepage:
- Size: 1.76 MB
- Stars: 428
- Watchers: 31
- Forks: 129
- Open Issues: 28
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
README
[](https://travis-ci.org/neXenio/BLE-Indoor-Positioning/builds) [](https://github.com/neXenio/BLE-Indoor-Positioning/releases) [](https://jitpack.io/#neXenio/BLE-Indoor-Positioning/) [](https://codecov.io/gh/neXenio/BLE-Indoor-Positioning) [](https://github.com/neXenio/BLE-Indoor-Positioning/blob/master/LICENSE)
# BLE Indoor Positioning
This repo contains a [Java library][package_core] that is capable of estimating locations based on advertising packets received from Bluetooth beacons. It also contains an [Android app][package_app] that uses this library to visualize beacon and location data.
# Usage
## Integration
#### Gradle
Release artefacts are available through [Bintray][bintray].
```groovy
dependencies {
compile 'com.nexenio.bleindoorpositioning:core:0.4.0'
}
```
If you want to use branch snapshots or specific commits, use [JitPack][jitpack].
```groovy
allprojects {
repositories {
maven { url 'https://jitpack.io' }
}
}
dependencies {
compile 'com.github.neXenio:BLE-Indoor-Positioning:dev-SNAPSHOT'
}
```
#### Maven
```xml
com.nexenio.bleindoorpositioning
core
0.4.0
```
#### JAR
You can download the latest `.jar` files from [GitHub][releases] or [Bintray][bintray].
## Bluetooth Scanning
You need to implement some sort of Bluetooth scanning in order to get the advertising data from nearby beacons. On Android, you can use the [BluetoothAdapter][androidbluetoothle] or libraries like [RxAndroidBle][rxandroidble] that wrap around the system APIs.
You'll get a scan result, which you can extract the beacon mac address and raw advertising data from. Forward that data to the `BeaconManager` singleton and it will take care of everything else.
```Java
private void processScanResult(ScanResult scanResult) {
String macAddress = scanResult.getBleDevice().getMacAddress();
byte[] advertisingData = scanResult.getScanRecord().getBytes();
int rssi = scanResult.getRssi();
BeaconManager.processAdvertisingData(macAddress, advertisingData, rssi);
}
```
The `BeaconManager` will create `Beacon` instances for you and hold them in memory. Each `Beacon` will hold a list of recent `AdvertisingPackets`. There are quite a few convenience methods for Eddystone and iBeacon available, too.
You can listen for beacon changes by registering a `BeaconUpdateListener`:
```Java
BeaconManager.registerBeaconUpdateListener(new BeaconUpdateListener() {
@Override
public void onBeaconUpdated(Beacon beacon) {
// have fun with your beacon!
}
});
```
For some more fine-tuned callbacks, you may want to use a `FilteredBeaconUpdateListener`, which will only emit updates when beacons match a `BeaconFilter` of your choice.
## Distance Estimation
Based on the received `AdvertisingPackets` (which also keep track of the [RSSIs][rssi]), you can get an estimated distance (in meters) to each Beacon. Simply call `beacon.getDistance()` or directly use the `BeaconDistanceCalculator`, which operates using the [Log-distance path loss model][log_distance_path_loss_model].
## Location Estimation
Based on the estimated distances to nearby beacons, the `IndoorPositioning` singleton can calculate the current geo coordinates of the device that received the advertising data. It utilizes the `Multilateration` class for that, which solves a formulation of n-D space trilateration problem with a nonlinear least squares optimizer (using the [Levenberg–Marquardt algorithm][levenberg_marquardt_algorithm]).
You can listen for location changes by registering a `LocationListener`:
```Java
IndoorPositioning.registerLocationListener(new LocationListener() {
@Override
public void onLocationUpdated(LocationProvider locationProvider, Location location) {
// have fun with your location!
}
});
```
The `Location` will contain latitude, longitude and altitude, as well as some convenience methods to get the distance or angle to a different location.
> This assumes that the geo coordinates of the beacons are known. You can assign a `BeaconLocationProvider` to any beacon instance, which could read the geo coordinates from the advertising data or some external API.
[releases]: https://github.com/neXenio/BLE-Indoor-Positioning/releases
[jitpack]: https://jitpack.io/#neXenio/BLE-Indoor-Positioning/
[bintray]: https://bintray.com/nexenio/BLE-Indoor-Positioning
[package_core]: https://github.com/neXenio/BLE-Indoor-Positioning/tree/master/BLE%20Indoor%20Positioning/src/main/java/com/nexenio/bleindoorpositioning
[package_app]: https://github.com/neXenio/BLE-Indoor-Positioning/tree/master/app/src/main/java/com/nexenio/bleindoorpositioningdemo
[rxandroidble]: https://github.com/Polidea/RxAndroidBle
[androidbluetoothle]: https://developer.android.com/guide/topics/connectivity/bluetooth-le.html
[rssi]: https://en.wikipedia.org/wiki/Received_signal_strength_indication
[log_distance_path_loss_model]: https://en.wikipedia.org/wiki/Log-distance_path_loss_model
[levenberg_marquardt_algorithm]: https://en.wikipedia.org/wiki/Levenberg%E2%80%93Marquardt_algorithm