Dynamic fine-grained localization in Ad-Hoc networks of sensors
Proceedings of the 7th annual international conference on Mobile computing and networking
A directionality based location discovery scheme for wireless sensor networks
WSNA '02 Proceedings of the 1st ACM international workshop on Wireless sensor networks and applications
Range-free localization schemes for large scale sensor networks
Proceedings of the 9th annual international conference on Mobile computing and networking
VOR base stations for indoor 802.11 positioning
Proceedings of the 10th annual international conference on Mobile computing and networking
Access Point Localization Using Local Signal Strength Gradient
PAM '09 Proceedings of the 10th International Conference on Passive and Active Network Measurement
Site-specific RSS signature modeling for WiFi localization
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Directional antenna diversity for mobile devices: characterizations and solutions
Proceedings of the sixteenth annual international conference on Mobile computing and networking
IEEE Transactions on Wireless Communications
GUIDE-gradient: A Guiding Algorithm for Mobile Nodes in WLAN and Ad-hoc Networks
Wireless Personal Communications: An International Journal
Place lab: device positioning using radio beacons in the wild
PERVASIVE'05 Proceedings of the Third international conference on Pervasive Computing
An accurate algebraic solution for moving source location using TDOA and FDOA measurements
IEEE Transactions on Signal Processing
The effects of the human body on UWB signal propagation in an indoor environment
IEEE Journal on Selected Areas in Communications
Poster: Phones and robots: brains and brawn
Proceedings of the 9th ACM Conference on Embedded Networked Sensor Systems
SpinLoc: spin once to know your location
Proceedings of the Twelfth Workshop on Mobile Computing Systems & Applications
EV-Loc: integrating electronic and visual signals for accurate localization
Proceedings of the thirteenth ACM international symposium on Mobile Ad Hoc Networking and Computing
Locating in fingerprint space: wireless indoor localization with little human intervention
Proceedings of the 18th annual international conference on Mobile computing and networking
Push the limit of WiFi based localization for smartphones
Proceedings of the 18th annual international conference on Mobile computing and networking
FLIGHT: clock calibration using fluorescent lighting
Proceedings of the 18th annual international conference on Mobile computing and networking
IODetector: a generic service for indoor outdoor detection
Proceedings of the 10th ACM Conference on Embedded Network Sensor Systems
FM-based indoor localization via automatic fingerprint DB construction and matching
Proceeding of the 11th annual international conference on Mobile systems, applications, and services
Avoiding multipath to revive inbuilding WiFi localization
Proceeding of the 11th annual international conference on Mobile systems, applications, and services
If you see something, swipe towards it: crowdsourced event localization using smartphones
Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing
From RSSI to CSI: Indoor localization via channel response
ACM Computing Surveys (CSUR)
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Today's WiFi access points (APs) are ubiquitous, and provide critical connectivity for a wide range of mobile networking devices. Many management tasks, e.g. optimizing AP placement and detecting rogue APs, require a user to efficiently determine the location of wireless APs. Unlike prior localization techniques that require either specialized equipment or extensive outdoor measurements, we propose a way to locate APs in real-time using commodity smartphones. Our insight is that by rotating a wireless receiver (smartphone) around a signal-blocking obstacle (the user's body), we can effectively emulate the sensitivity and functionality of a directional antenna. Our measurements show that we can detect these signal strength artifacts on multiple smartphone platforms for a variety of outdoor environments. We develop a model for detecting signal dips caused by blocking obstacles, and use it to produce a directional analysis technique that accurately predicts the direction of the AP, along with an associated confidence value. The result is Borealis, a system that provides accurate directional guidance and leads users to a desired AP after a few measurements. Detailed measurements show that Borealis is significantly more accurate than other real-time localization systems, and is nearly as accurate as offline approaches using extensive wireless measurements.