BACKGROUND Detailed information about animal location and movement is often crucial in studies of natural behaviour and how animals respond to anthropogenic activities. Dead-reckoning can be used to infer such detailed information, but without additional positional data this method results in uncertainty that grows with time. Combining dead-reckoning with new Fastloc-GPS technology should provi...

The Swarm mission aims to study the principle and change regularities of Earth’s magnetic field. Precise orbit determination is essential successful implementation relevant scientific research. This article focuses on using two different double-difference methods improve accuracy kinematic determination. relies entirely space-borne observation data, independent any dynamic parameters. analyzes ...

In this paper, a robust heading determination method is proposed for low-cost attitude and reference system (AHRS) aided by the global positioning (GPS). As compared with traditional GPS/SINS-integrated navigation-based method, in information obtained from GPS velocity outputs first incorporated into observation vector, which constructs novel completed GPS/SINS integration framework greatly imp...

In recent years, tectonic plate movements have caused huge natural disasters, such as the Great Sumatra-Andaman earthquake and the resulting Asian tsunami, which led to significant loss of human lives and properties (Ammon et al., 2005; Lay et al., 2005). Scientific evidences proved it was the beginning of a new earthquake supper-cycle in this active area (Sieh et al., 2008). In order for scien...

We adopt Poisson wavelets for regional gravity field recovery using data acquired from various observational techniques; the method combines data of different spatial resolutions and coverage, and various spectral contents and noise levels. For managing the ill-conditioned system, the performances of the zeroand first-order Tikhonov regularization approaches are investigated. Moreover, a direct...

OBJECTIVE To assess if data collected by a consumer organisation are valid for a health service research study on physicians' performance in preventive care. To report first results of the analysis of physicians performance like consultation time and guideline adherence in history taking. DESIGN Secondary data analysis of a clustered cross-sectional direct observation survey. SETTING Genera...

The Global Positioning Systems (GPS) and Inertial Navigation System (INS) technology have attracted a considerable importance recently because of its large number of solutions serving both military as well as civilian applications. This paper aims to develop a more efficient and especially a faster method for processing the GPS signal in case of INS signal loss without losing the accuracy of th...

Spoofing could pose a major threat to Global Positioning System (GPS) navigation, so the GPS users have to gain an in-depth understanding of GPS spoofing. Since spoofing attack can influence position results, spoof compensation is possible through reducing position deviations. In this paper, a novel processing technique is proposed and the wavelet transform is used to eliminate the impact of sp...

GPS solutions offer direct dynamic monitoring of long-span and tall civil structures. Timely and correct interpretation of the solutions is essential to improved monitoring and reduced number of false alarms. In this article, a new approach has been developed which employs the principal component analysis (PCA) of wavelet transformed GPS solutions to detect out-of-control signals. The methodolo...

reduced rainfall in many parts of the world have prompted scientists to try to manipulate, in different ways, to the nature, causing precipitation from accumulated water in the atmosphere. atmospheric ionization is a new method for producing precipitation and has attracted much attention. in this regard, in recent years, in some regions of the world, in different ways, the relation between mete...