Magnetometer is essential for finding out orientation of any object using earth’s magnetic field. This is done by measurements of earth magnetic field along three perpendicular directions. In this design magneto resistive sensors are aligned in perpendicular directions are used for measuring the field. Sensor output voltages are digitized using ADC and send to DSP. Algorithms are implemented in...

The sun vector is commonly used for defining a satellite attitude and many types of sensors exist for its determination. An attitude determination system is designed for each satellite project based on missions’ requirements. A fine pinhole sun sensor type was chosen and designed for HORYU-IV nanosatellite of Kyushu Institute of Technology. This sensor has a round-shaped hole and uses commercia...

Abstract Aiming at the low measurement accuracy of magnetometer, a high stability constant current source circuit is developed to drive indium arsenide Hall sensor, designs self stabilizing zero preamplifier pick up magnetic field signal, and uses low-noise structure adaptively adjust signal amplification make reach highest signal-to-noise ratio. After analog-to-digital conversion with high-lin...

We demonstrate interoperable mobile agents for languageand platform-independent wireless sensor network programming, with low-power resource-constrained embedded devices as static nodes and Android-based smartphones as mobile nodes, over disparate networks: 6LoWPAN and Wi-Fi. Representational state transfer architectural principles are applied in agent composition, control and migration and exp...

The importance of tilt capability for sun glint avoidance for future global ocean color missions was analyzed. The analyses focused on Sea-viewing Wide Field-of-view Sensor (SeaWiFS) mission, because its radiometric, orbital, and sensor characteristics are well defined. The analyses concentrated on two major questions: 1) does tilting to avoid sun glint increase or decrease the total ocean cove...

This paper describes a Kalman filter design to estimate orientation of human body segments by fusing gyroscope, accelerometer and magnetometer signals. Ferromagnetic materials near the sensor disturb the local magnetic field and therefore the orientation estimation. The magnetic disturbance can be detected by looking at the total magnetic density and a magnetic disturbance vector can be calcula...

In this paper, a real-time predictive filter is derived for spacecraft attitude estimation without the utilization of angular rate measurements from gyros. The formulation described in this paper is shown using only attitude sensors (e.g., three-axis magnetometers, sun sensors, star trackers, etc.). The new real-time nonlinear filter predicts the required torque modeling error input in order to...

Three-dimensional (3D) knee angle measurement is one of the key measures in human gait analysis. Inertial sensor capable measuring joint motion under unconstrained conditions a practical tool for clinical evaluation and rehabilitation. An inertial unit (IMU) consisting accelerometer gyroscope allows orientation 3D with an additional (i.e., magnetometer). However, ferromagnetic interference nega...

In this paper, we report a newfound vulnerability on smartphones due to the malicious use of unsupervised sensor data. We demonstrate that an attacker can train deep Convolutional Neural Networks (CNN) by using magnetometer or orientation data to effectively infer the Apps and their usage information on a smartphone with an accuracy of over 80%. Furthermore, we show that such attacks can become...

Kalman Filter (KF) based algorithms are the most frequently employed attitude estimation algorithms. Typically, a fully observable system necessitates use of two distinct sensor types. Therefore, relying on single sensor, such as magnetometer, for spacecraft is deemed to be challenge. The present investigation centers utilizing magnetometers exclusive sensor. Several KF have been designed and e...