Déjà Vu - A local RF based back end for the µg Pro

UnifiedNlp backend that uses locally acquired WLAN/Wi-Fi AP and mobile/cellular

tower data to resolve user location. Collectively, “WLAN/WiFi and

mobile/cellular” signals will be called “RF emitters” below.

Conceptually, this backend consists of two parts sharing a common database. One

part passively monitors the GPS. If the GPS has acquired and has a good position

accuracy, then the coverage maps for RF emitters detected by the phone are

created and saved.

The other part is the actual location provider which uses the database to

estimate location when the GPS is not available.

This backend uses no network data. All data acquired by the phone stays on the

phone.