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Sub-room-level location-based services are poised to impact people's daily lives in the near future. Sub-room-level semantic location history (SLH) construction is an essential component of such services. However, little in-depth research on constructing SLH in sub-room-level scenarios has been conducted. In this paper, we propose iMiner, an automatic sub-room-level SLH construction system. iMiner...
Scale Invariant Feature Transform (SIFT) has drawn attention in the field of computer vision, recently. SIFT has been adopted in many visual localization and mapping applications, for its robustness to scale, rotation and illumination changes. However, the high computational cost limits its use in practical scenarios. In this paper, we present a real-time FPGA-based hardware accelerator of SIFT. The...
With the development of information technology, people's demand for location-based services is gradually increasing. Indoor localization and navigation is becoming increasingly popular. Wi-Fi fingerprinting localization is a low-cost and feasible method. Due to the impact of the AP (Access Point) itself and the indoor environment, real-time AP signal strength value will be volatile. In order to keep...
An Inertial Navigation System (INS) is self-contained, immune to jamming/interference and in many other ways is ideally for pedestrian navigation applications especially in indoor environments. However, due to the sensor properties the quality of the navigation solution from a stand-alone INS will degrade rapidly, and must rely on some form of external correction/calibration/aiding to ensure system...
A good feature representation of the high resolution range profile(HRRP) is important in radar automatic target recognition. In this paper, denoising autoencoder is used to automatically extract features and the output can be seen as the non-linear overcomplete representation of HRRP. Multi-layer perceptron is used as the final classifier. White Gaussian noise is added to test the robustness of our...
In this study, the Application Interface (API) of Baidu map service was took as an example to establish a POI (Point of Interest) collection and management system (POI-CMS) based on GeoServer, PostgreSQL and PostGIS via visual studio 2010 and C# language. The newly developed POI-CMS offers one-stop POI service, including POI collection, storage, management and dissemination. The successful design...
Global Navigation Satellite System(GNSS) can provide near-earth space with all-weather, high precision of position and time information. However, GNSS is very difficult to penetrate walls and other shelter because the power on the ground is only about −130dbm. Thus, there is no doubt that GNSS can't work indoors. POI(Point of Interest) has been increasingly abundant. There is an intense trend of positioning...
Wearable electronic devices have experienced an increasing development with the advances in the semiconductor industry and are receiving more attention during last decades. This paper presents a brand new application of inertial sensor-based foot-mounted wearable electronic device: game play. The introduced device is able to monitor and identify human foot stepping directions in real time, and coordinate...
A kind of intensive positioning approach, which is based on Radio Frequency Identification (RFID) technology, is proposed in this paper. In order to achieve precise positioning in the dense communication cabinet which possesses many jacks, the fingerprint positioning method is applied in this study. At the offline stage, the Received Signal Strength Indication (RSSI) values of a certain RFID label...
A new method to enhance Wi-Fi based indoor Pedestrian Dead Reckoning (PDR) in corridors by fusing uncalibrated security cameras is proposed in this paper. An algorithm using uncalibrated security cameras to infer a user's heading in corridors is developed. Android devices and a security camera system are used to build up an experimental platform for field data collection and algorithm development/assessment...
Since the setup of GNSS (Global Navigation Satellite System), receiver technique has been developing all this long way. Traditionally, A conventional system-level tacking loop normally consists of a FLL, a PLL, a DLL which are separately in charge of the continuous estimations of Doppler frequency, carrier phase, and code phase. All these three componential loops are derived from one common control...
The location and context switching, especially the indoor and outdoor scenario switching, provide basic and original information for various mobile applications. Diverse smartphone placements and limited battery supply pose challenge for the accurate and robust indoor-outdoor identification. In this paper, a pervasive indoor and outdoor scenario identification algorithm is proposed, which utilizes...
In the paper, the ultra-wideband (UWB) localization method based on multi-task compressive sensing (MT-CS) is proposed to solve the UWB localization accuracy performance problem. In the indoor multi-path NLOS environment, the transmission channel pulse response (CIR) is estimated precisely by use of the MT-CS algorithm, and least square error (LSE) algorithm are calculated to estimate the target location...
Polarization information is widely used in laser communication as well as the detection of aerosol and clouds, etc. But the variation and degradation of the laser polarization state will seriously reduce the coherent efficiency, which will degrade the performance of coherent lidar. In this research, the method of polarization diversity reception (PDR) is mainly analysed to remove the decrease of coherent...
In recent years, target remote sensing based on the Micro-Doppler effect opens up a new way to target recognition and classification. One of the critical works in this research is parameter estimation. With maximum likelihood estimator (MLE) method, we can achieve the optimal unbiased result comparing with those suboptimal estimations, but the highly nonlinear and multimodal cost function of the Micro-Doppler...
The popularity of smartphone enables the capability of sensing the human activity, which can be used to provide various intelligent context-aware services. Most existing methods on human motion mode recognition assume that all sensors are mounted in a fixed position on users' body while walking. However, it is inconvenient for a user to mount his/her phone in a specific position. When a user holds...
Pedestrian Dead Reckoning is an algorithm which uses sensors such as accelerometer, gyroscope and magnetometer to provide real-time location services. Since these sensors are integrated into smartphones, smartphone based PDR system becomes an efficient alternative of indoor positioning method. Heading estimation is a crucial part of PDR system, because step length of a pedestrian can be well modelled...
The pseudolite system is a good alternative for positioning in indoor environment where few satellites are available. However, the ephemeris data format for common GNSS reciever does not apply to the stationary pseudolites located on the ground. To utilize the pseudilote signals, common receivers need to be modified to process the signal from the pseudolite. Some existing method are proposed to solve...
The key technology in aircraft guidance and medical diagnosis is the multi-sensor images matching. In this paper, a matching method based on binary auto-encoding features is proposed for the multi-sensor image with large difference in the imaging characteristics. Firstly, the image is convoluted and encoded by the template. Secondly, the convolution result is pooled, binaried, and converted into binary...
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