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Existing methods for optimal configuration of multi-sensor suited for two dimension only or use numerical simulation to search optimal configuration, only sub-optimum solution can be realized. Based on evaluation index of Cramer-Rao lower bound(CRLB) of positioning, an universal method to obtain analytic solutions for optimal configuration is proposed. Based on this method, we derive that circularly...
This paper studies the algorithms for determining a BDS satellite's velocity using the broadcast ephemeri. Firstly, by taking the time derivatives of the Kepler orbit elements and the correction terms, the algorithm comprises close-form analysis formulas and the processing steps for directly computing a BDS satellite's instant velocity using the broadcast ephemeris is derived, and its validity is...
An enhanced version of the popular split-step Fourier method (SSFM) is presented. When used for digital backpropagation, the enhanced method allows a complexity reduction of up to one order of magnitude with respect to standard SSFM without sacrificing performance.
In this paper, an algorithm is proposed to provide position data of vehicles with high accuracy and low cost. It is to use same number of satellites or same satellites number, then calculates absolute coordination of vehicles using distance between vehicles. Finally it can enhance accuracy of relative positioning in vehicles.
This paper aims to provide the reader with a review of the main technologies explored in the literature to solve the indoor localization issue. Furthermore, some systems that use these enabling technologies in real-world scenarios are presented and discussed. This could deliver a better understanding of the state-of-the-art and motivate new research efforts in this promising field. Finally, focusing...
Localization errors can play an important role in measurements of radio propagation or spectrum utilization, especially in urban environment where GPS localization accuracy is highly varying. In this paper we present a low cost and simple method for mitigating the impact of localization errors, based on multiple GPS receivers. The presented results are based primarily on performance evaluation of...
A method of resistance calibration without external precision elements usage presented in paper. In the proposed method, used structures which operation based on technologically accurate elements and signals to have high accuracy resistance after calibration. Architecture produces a calibration code corresponding to 50Ohms PVT compensated termination impedance, which is needed to avoid reflections...
The matrix barcodes known as Quick Response (QR) codes, which are enable us to import printed digital information into smart-phone or cell phone through its digital camera easily, are rapidly becoming widespread not only Japan but also Asia, Europe and America. However, an attacker is easily able to lead malicious web-sites by putting a unauthenticated QR code on a authenticated QR code. We propose...
The geometry dilution of precision (GDOP) has been widely used as an accuracy metric for GNSS. The conventional GDOP, mainly investigated for single GNSS, is not valid for multi-GNSS because of the system time offset among GNSSs. This paper performs a GDOP analysis for two scenarios where the system time offset is resolved respectively at system level and at user level in presence of any number of...
This paper presents a localization method of multiple living-bodies suitable for multi-path environments. The time-variant Multiple-Input Multiple-Output (MIMO) channel is measured and the bistatic MIMO radar estimates multiple target locations from Fourier-transformed channel information. Measurements are carried out in an indoor environment, and it is shown the proposed method can estimate multiple...
Localization of nodes is a very crucial issue in many wireless sensor network (WSN) applications. In this paper, we consider a WSN initially consisting of a single location-aware mobile anchor nodes and a number of location-unaware, stationary nodes, and propose two algorithms to localize the unknown nodes using the mobile anchor nodes. We can obtain the location information of the unknown nodes through...
Error estimating coding has attracted significant attention recently. It enables a receiver to estimate bit error rate (BER) of a partially correct packet. Our study in this paper shows that based on the popular M-QAM modulation schemes, symbol errors have a well-defined structure, which is ultimately translated into a strong correlation in the BER of bits that constitute a symbol. We leverage this...
In this paper we introduce a new approach for modeling covert channel algorithms utilizing automated code generation and evaluation in real network environments. Our proposed framework is called Automated Covert Channel Modeling over Networks (ACCM-Net), which allows the user to convert any general description of a covert channel algorithm into executable code using an automated process. The resulting...
Localization and tracking of players is crucial for monitoring both indoor and outdoor sports activities. The effects of the environment pose a major challenge for an accurate position estimation. In this paper, we present a novel solution based on the received signal strength indication (RSSI) feature provided by off-the-shelf wireless networks. Trilateration is used for estimating the position of...
To test satellite navigation devices, the establishing scheme of local time standard steered by national time standard is proposed. The scheme establishes a GPS common-view time transfer system, traces the local atomic clock to UTC(NIM) by data comparison, determines which factors can influence the comparison accuracy, solves a predict equation, and ultimately implements the real-time value transfer...
This paper proposes a novel and efficient jitter analysis method for high speed links. Based on step responses of the high speed link and information of jitters injected, the proposed method generates the eye diagram of link receiver for jitter impact evaluation. In this method, the range of jitter is converted into the range of voltage variation on step responses. Bounds of the eye diagram are calculated...
This paper proposes a novel joint time of arrival (TOA)/received signal strength indicator (RSSI)-based wireless capsule endoscope (WCE) location tracking method without prior knowledge of biological human tissues. Generally, TOA-based localization can achieve much higher localization accuracy than other radio frequency-based localization techniques, whereas wireless signals transmitted from a WCE...
GNSS scalar tracking loop tracks each satellite signal in one channel separately, while vector tracking loop track all of the satellite signals in one navigation filter. Three major advantages of the vector tracking loop are reduction of estimated parameters, aiding weak signal tracking by strong signal and aiding signal tracking by navigation solutions. Differ from the former researches in which...
The paper shows the results of the research concerning the determination of aircraft positioning accuracy with the use of Global Positioning System and European Geostationary Navigation Overlay Service. Experimental flights were conducted in 2013, in south-eastern part of Poland. A precise aircraft position was determined with the use of dual frequency geodetic Topcon receivers with centimeter accuracy...
With the growing use of the Global Positioning System (GPS) in many fields (air, land, sea and space) as advanced navigation system which provide high accurate and reliability for the position (latitude, longitude and altitude) and velocity with time. Multipath is one of the contributing sources of errors that impact on the precision and reliability of GPS. This paper investigates impact of multipath...
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