Q: In my design course in aerospace engineering, my group is building an unmanned aerial vehicle (UAV), which means the aircraft must fly on its own. My task is to choose a gyro for the aircraft to measure angular rates about the aircraft axes. The problem is that when I look at the spec sheet for gyros there are many numbers that I do not know how to interpret. Can someone at IEEE Control Syst...

Hot magnetic stars often exhibit incoherent circularly polarized radio emission thought to arise from gyro-synchrotron by energetic electrons trapped in the circumstellar magnetosphere. Theoretical scalings for electron acceleration reconnection driven centrifugal breakout match well empirical observed luminosity with both field strength and stellar rotation rate. This paper now examines how in...

The quaternion estimation (QUEST) batch attitude determination algorithm has been extended to work in a general Kalman-filter framework. This has been done in order to allow the inclusion of a complicated dynamics model and to allow the estimation of additional quantities beyond the attitude quaternion. The QUEST algorithm, which works with vector attitude observations, serves as a starting poi...

Purpose: We evaluated the short-term effects of cobalt-60 gyro rotating stereotactic radiotherapy (gyro knife) for primary hepatocellular carcinoma (HCC) ineligible for local therapy or surgery. Methods: Between August 2010 and December 2014, gyro knife radiotherapy was used in our department of radiation oncology to treat 63 patients with HCC who met the inclusion criteria and were unable or u...

In this theoretical paper, the wide-band low-gain feature of a tapered smooth wall gyro-traveling wave tube (gyro-TWT) was combined with the low beam energy, low magnetic field, and high gain, though narrow band, feature of a vane loaded nontapered gyro-TWT, to propose a distributed, tapered vane loaded gyro-TWT for both high gains and wide bandwidths. The device was analyzed for the tapering o...

A generalized linear theory that allows for mismatched boundary conditions was used in determining the starting oscillation conditions for gyrotron backward wave oscillators (gyro-BWO). The results reveal that the gyro-BWO interaction is normally caused by the interference between a constant-amplitude backward wave and a decaying backward wave. The latter becomes a forward-growing wave if the o...

Rotation vector algorithm regarded as a classical and conventional attitude algorithm is widely used in strapdown inertial navigation system. This kind of algorithm usually uses incremental angle in calculation processes. However, the output of fiber-optic gyro is angular rate. Integrating angular rate to get incremental angle leads calculation errors. In this paper, a set of improved attitude ...

This paper is devoted to the development of a map matching algorithm for a train positioning system. Due to the nonsteerable truck design associated with rail vehicles, rail track curvatures are reasonably small. Consequently, track signatures, such as curves, are difficult to identify using low-cost sensors. The algorithm proposed in this work takes full advantage of the inherited “one-dimensi...

In some aerospace vehicles, the tracking sensors which act in a tracking loop as stabilizer are mounted on a two degree of freedom gyro. The gyro must align its rotor axis with the line of sight in order to remove tracking errors. The tracking precision and sensitivity are functions of the gyros performance. One of the main factors in reducing the precision and producing instabilities is nutati...