A Stellar Gyroscope is a star based attitude propagator that is capable of propagating a spacecraft’s attitude between camera frames by tracking the motion of the stars in the field of view. An algorithm to calculate the attitude maneuver in three degrees of freedom from successive star field images is described. Unlike traditional gyroscopes, the Stellar Gyroscope is capable of drift free atti...

A new global navigation satellite system (GNSS) carrier-phase attitude model and its solution are introduced in this contribution. This affine-constrained GNSS attitude model has the advantage that it avoids the computational complexity of the orthonormality-constrained GNSS attitude model, while it still has a significantly improved ambiguity resolution performance over its unconstrained count...

Global Navigation Satellite Systems (GNSS)-based attitude determination is a viable alternative for traditional methods such as gyroscopes. Precise attitude determination using multiple GNSS antennas mounted on a remote sensing platform relies on successful resolution of the integer carrier phase ambiguities. The Multivariate Constrained (MC-) LAMBDA method has been developed for the multivaria...

Background: Unhealthy nutrition at early years of life causes some diseases such as cardiovascular diseases, cancers, diabetes, gastrointestinal disorders, and bone and joint diseases during adulthood. In other words, many of wrong health behaviors are rooted in childhood experiences. This study was conducted to examine effect of interventional programs on knowledge, attitude and nutritional be...

Background The present study aimed to explore effects of companionship in training sessions on primiparous women’s knowledge, attitude and performance toward breastfeeding. Materials and Methods: In this case- control interventional study, 105 primiparous women in the 30th to 34th weeks of pregnancy were selected and assigned to three groups, namely the intervention group without a companion ...

This paper reports a study of attitude manifestations in video blogs. We describe the manual annotation of speaker attitudes in a corpus of over 130 video blogs and present an analysis of prosodic and visual cues in relation to attitude states. We use machine learning techniques for the automatic prediction of attitudes from prosodic and visual features in video blogs and compare the performanc...

This paper discusses the development of a particle filter for attitude and angular rate estimation of a space object using light curve observations. The particle filter approach used is based on the generalized Rodrigues parameters (GRPs) local error representation. The global state used is the quaternion to avoid singularity in the attitude states. Uniform quaternions are generated to approxim...

This paper constructs a relationship between attitude and translational movement of a quadrotor, and presents a PD logic tracking control design algorithm capable of not only stabilizing attitude but also tracking a desired trajectory accurately. In contrast to conventional flight control systems, the artificial inner/outer-loop structure is eliminated via using a third-order time optimal track...