Between 2010 and 2011, the author’s group developed a practical SQUID system applicable to minerals exploration under the development of the next generation SQUITEM equipment and SQUID magnetometers, commissioned by Japan Oil, Gas and Metals National Corporation (JOGMEC). With the successful completion of final tests in Australia, a practically designed SQUID system developed for electromagneti...

The choice of the signal processing method may improve characteristics of the measuring device. We consider a measurement error of the signal processing regression methods of a quasiharmonic signal generated in a frequency selective device. The results applied to analyze the difference between the simple period meter processing and regression algorithms using measurement cycle signal data in pr...

This paper describes the selection and integration of attitude sensors for a novel flying device. The overall goal of the experimental flyer project is to create a small, cheap, and lightweight device that is capable of controlled flight. This project focuses on the development of a state estimation system for the flyer that allows for precise and rapid attitude measurement. A sensor package co...

The paper describes a scalable, wearable multi-sensor system for motion capture based on inertial measurement units (IMUs). Such a unit is composed of accelerometer, gyroscope and magnetometer. The final quality of an obtained motion arises from all the individual parts of the described system. The proposed system is a sequence of the following stages: sensor data acquisition, sensor orientatio...

[1] We describe a scale-free search for magnetic holes in the solar wind using Wind magnetometer observations between 1994 and 2004. Using magnetic field and ion measurements on the Wind spacecraft, we present the first statistical study of magnetic hole plasma signatures on the kinetic scale and we evaluate magnetic holes as kinetic and fluid phenomena. Magnetic holes are shown to be pressure-...

We present an extension of the non-linear two-step estimation algorithm originally developed for the calibration of solid-state strapdown magnetometers. We expand the algorithm to include nonorthogonality within a sensor set for both two and three axis sensors. Non-orthogonality can result from manufacturing issues, installation geometry, and in the case of magnetometers, soft iron bias errors....

Error factors in the encoded sun sensor (ESS) are analyzed and simulated. Based on the analysis results, an ESS error compensation model containing structural errors and fine-code algorithm errors is established, and the corresponding calibration method for model parameters is proposed. As external parameters, installation deviation between ESS and calibration equipment are introduced to the ES...

The Data Timed Sending (DTS) protocol contributes to the energy savings in Wireless Sensor Networks (WSNs) and prolongs the sensor nodes’ battery lifetime. DTS saves energy by transmitting short packets, without data payload, from the sensor nodes to the base station or the cluster head according to the Time Division Multiple Access (TDMA) scheduling. Placing the short packets into appropriate ...