Guoguo: Enabling Smartphone-based Fine-grained Indoor Localization



Since our daily activities are dominantly indoor, as smartphones emerge as the most popular personal computing companions, major IT companies recently launched aggressive investment on mobile indoor location services and positioning systems, e.g., on iOS or Android mobile devices. However, one major hurdle has not been conquered yet: smartphone-based high-resolution indoor localization. In this project, we propose a practical and accurate solution that fills the long-lasting gap for the first time (foot-level vs. meter-level with GPS, WiFi, or RSS). Without additional hardware components/extensions on users’ smartphones, the proposed Guoguo algorithm and system leverages pervasive microphones and adopts acoustic signals for smartphone-based fine-grained indoor localization. Experimental results demonstrate that the Guoguo system achieves high-accurate localization of 6cm and significantly outperforms most existing smartphone-based indoor localization schemes. For the first time, we can pinpoint a smartphone user within one foot, ushering in the dawning of enormous mobile indoor location and navigation services and applications.[More]

NSF I-Corps: Commercialization Feasibility Research and Implementation for Smartphone Localization via Indoor Positioning Satellites and Opportunistic Sensing

I am the Entrepreneurial Leader. Main points: a) Hybrid sensing approach for large scale indoor localization and navigation based on own designed BLE hardware (Apple iBeacon supported). b) Targeting real system deployment; collaborate with Harn Art and Natural History Museum for field test. [More]

ToGathor: The Mobile Social Network with Missions

We design a hybrid cyber-physical mobile social network ToGathor for social and crowd missions with the following salient features: crowd sensing/sourcing, crowd localizing, cooperative localization, connecting friends socially and physically, dynamic location-based checkin points, tracking nearby friends or team members or children/elders, and mission-oriented groups. ToGathor providing messaging services using hybrid connection (remote and local) and enable social applications via daily physical interaction. We bootstrap ToGathor for high scalability via back-end Cloud server with processing off-load, high throughput messaging, big data stream processing, key-value and persistent data-store.[More]


Mobile Crowd Sourcing/Sensing (MCS)

I am the Project Leader. The main points of this project is to: a) As a new paradigm for participatory sensing, MCS is suitable for large-scale hard tasks that are costly, or infeasible with conventional methods. We target the application of finding and locating the lost child in crowds via MCS. b) We propose MCS-based collaborative localization via nearby opportunistically connected participators. Semidefinite Programming (SDP) based global optimization approaches are proposed to leverage all the measurements in a best-effort way. [More]

InAR: Smartphone on Steroids with Indoor Augmented Reality

I am the Project Leader. a) Augmented Reality is one of the most exciting future mobile techniques. We target more challenge indoor environment for smartphone-based augmented reality. b) The Smartphone App includes accurate attitude, pose and location estimation using INS; Hybrid approaches with image registration and tracking. The designed App is expected to make you excited to explore your surroundings with enriched content. [More]


VitalCloud: Weaving a Pervasive Life Network for Healthcare

We develop an enabling technology for long-term continuous healthcare monitoring through a pervasive noncontact cyber-physical network, called VitalNet. By deploying in indoor environments, such as hospitals or senior centers, it can monitor the activities and patterns of the multiple, mobile subjects at the same time with little to no user cooperation. To realize the objectives of our proposed research tasks, we integrate hardware, software, and advanced algorithms to solve the following research tasks: 1) Active Sensing and Data Fusion with MIMO Micro-Radars; 2) Design mixed cooperative sensing algorithms; 3) Build the VitalNet hardware and software testbed; 4) Design and implement the VitalNet runtime management system and services. With the help of VitalNet cyber-physical systems, an individual or a small group of nurses or doctors can take care of hundreds or thousands of elders with finer details about their vital signs and without spatial or temporal barriers. [More]

OKGems: A GENI-Federated Cyber-Physical System with Multi-Modalities, NSF/BBN GENI

This project is to create a multimodal cyber-physical system that provides a novel programmable virtual laboratory platform for experiments on sensor networks, mobile robotics, and hybrid cyber-physical systems. This cyber-physical system will be integrated with the global GENI testbed for shaping the future Internet. [More]



Social-aided Cooperative Localization

The popularity of GPS-enabled smartphones enables a wide variety of new location-based or location-aware services and applications. However, the GPS module in a smartphone produces inaccurate position information and incurs high energy consumption, which inhibits the wide use of location-aware applications. To address this, we propose a social-aided cooperative localization scheme, which is capable of improving positioning accuracy and achieving low energy consumption. Specifically, our scheme enhances positioning accuracy by fusing the GPS positions of multiple co-located smartphones in a social network, or by neighborhood-based weighted least-squares estimation when relative distances between smartphones are available. The energy efficiency is achieved by sharing location information among co-located users so that only a small set of smartphones need to turn on GPS receivers at any time. Experimental results show that our proposed cooperative localization scheme can achieve sufficient performance gains in both indoor and outdoor environments. [More]

UWB Through-the-wall Detection and Communication System Demonstration, 863 High-Tech Program, MOST of China, No.2009AA011204

(Jan., 2009 ~ Dec., 2010). The team leader of this project, responsible for the weekly meeting and project development. [More]

Development of UWB SOC and Demo Test-Bed, Supported by 863 High-Tech Program, MOST of China, No.2007AA01Z2B2

(Jun., 2007 to Dec., 2009). This project developed China’s first IR-UWB network.[More]

Research on Impulse Radio Mono-bit Receiver, Supported by National Nature Science Foundation of China(NSFC), No. 60802008

(Jan., 2009 ~ Dec., 2011).