Inertial sensor assisted acquisition, tracking, and pointing for high data rate free space optical communications

Lee, S.; Ortiz, G.G.

doi:10.1109/leos.2003.1251613

Cited by 4 publications

(5 citation statements)

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“…The principle concept and algorithm for using a linear accelerometer along with the simulation results are given. A simple angular position algorithm is described [20]. Lu et al have presented the necessity of high bandwidth, response speed, and stable precision of FSM.…”

Section: Backgrounds and Related Workmentioning

confidence: 99%

“…The major limitations of FSO are line of sight maintenance for continuous data flow [3,16] and wavefront correction to significantly decrease the BER [1,2,7,19]. Therefore, a micromechanical autotracking, pointing acquisition and tracking (PAT) system, with beam steering controller design to mitigate the beam fluctuation [3,17,20] and an adaptive optics system to compensate the wavefront aberration, phase fluctuations [10,14,19], become significant to improve the link reliability and the data rate [1,2,11,21].…”

Section: Introductionmentioning

confidence: 99%

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Mitigation of beam fluctuation due to atmospheric turbulence and prediction of control quality using intelligent decision-making tools

Raj¹,

Selvi²,

Kumar³

et al. 2014

Appl. Opt.

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In free-space optical link (FSOL), atmospheric turbulence causes fluctuations in both intensity and phase of the received beam and impairing link performance. The beam motion is one of the main causes for major power loss. This paper presents an investigation on the performance of two types of controller designed for aiming a laser beam to be at a particular spot under dynamic disturbances. The multiple experiment observability nonlinear input-output data mapping is used as the principal components for controllers design. The first design is based on the Taguchi method while the second is artificial neural network method. These controllers process the beam location information from a static linear map of 2D plane: optoelectronic position detector, as observer, and then generate the necessary outputs to steer the beam with a microelectromechanical mirror: fast steering mirror. The beam centroid is computed using monopulse algorithm. Evidence of suitability and effectiveness of the proposed controllers are comprehensively assessed and quantitatively measured in terms of coefficient of correlation, correction speed, control exactness, centroid displacement, and stability of the receiver signal through the experimental results from the FSO link setup established for the horizontal range of 0.5 km at an altitude of 15.25 m. The test field type is open flat terrain, grass, and few isolated obstacles.

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Section: Backgrounds and Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mitigation of beam fluctuation due to atmospheric turbulence and prediction of control quality using intelligent decision-making tools

Raj¹,

Selvi²,

Kumar³

et al. 2014

Appl. Opt.

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show abstract

“…By contrast, the cut-off frequency of the drift rejection with the MDOB is much smaller for constant K , which means that it can bring much better drift rejection ability as shown in Figure 5. Under the MFC structure as shown in Figure 2, the disturbance suppression ability of the position loop is depicted as Equation 14, and the disturbance suppression ability of the position loop with the MDOB is shown in Equation (15). Through the comparison of Equations (14) and (15), the disturbance suppression ability of the position loop is changed by introducing the MDOB to the MFC, and the improvement can be represented as 1/(1 + G a C f ) < 1.…”

Section: Modified Disturbance Observermentioning

confidence: 99%

“…In order to improve the performance of control bandwidth and disturbance suppression, the micro-electro-mechanical system (MEMS) accelerometer has been widely recommended for the TCS due to its high bandwidth, small size and low weight [11][12][13][14][15]. The MEMS accelerometer can compensate for the mechanical resonance in the acceleration feedback control loop, and is 2 of 12 therefore utilized to enhance the stiffness of the controlled object.…”

Section: Introductionmentioning

confidence: 99%

A Modified Disturbance Observer Structure Based on Acceleration Measurement for Disturbance Suppression in Tracking Control System

et al. 2018

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The micro-electro-mechanical system (MEMS) accelerometer is widely adopted in many engineering control systems due to its extraordinary performance with high bandwidth, small size and low weight. However, massive drift caused by its insensitively at low frequency is the main factor which limits its performance. It leads to integral saturation when the feedforward method is used and hinders the improvement of disturbance suppression ability at low frequency, which is a significant factor for evaluating the closed-loop performance of a high-precision tracking system. To solve this problem, a modified disturbance observer structure and its corresponding new controller, which can improve disturbance suppression performance at low frequency by effectively rejecting more drift and weakening the occurrence possibility of integral saturation when drift exists, are proposed. Detailed analyses and a series of comparative experimental results verify that the proposed method can effectively enhance disturbance suppression performance at low frequency.

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“…Dynamic K is proposed to find the nearest reference points to locate. Sensor-assisted tracking [18]- [20] method is used to improve the location accuracy and not increased the amount of calculation in high complex environments.…”

Section: Introductionmentioning

confidence: 99%

Modified Fingerprinting Algorithm for Indoor Location

Ding¹,

Gao²,

Wang³

2017

JCM

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This paper proposes a modified fingerprinting hybrid location algorithm for homogeneous and heterogeneous indoor environment. The new method is designed based on fingerprinting to improve the location accuracy. It works in two phases: one is offline phase, which opts for the location of reference point by different kind of complex regions. Another one is online phase, which proposes dynamic K for finding the nearest reference point to improve location accuracy. Sensorassisted tracking hybrid positioning function is utilized to further improve the low location accuracy problem of heterogeneous regions. Simulation results show that the new method obtains approximately 37.7% improvement comparing with the classical fingerprinting-based algorithms, the location accuracy reaches to 0.5m in 200m×200m heterogeneous network.

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Inertial sensor assisted acquisition, tracking, and pointing for high data rate free space optical communications

Cited by 4 publications

References 0 publications

Mitigation of beam fluctuation due to atmospheric turbulence and prediction of control quality using intelligent decision-making tools

Mitigation of beam fluctuation due to atmospheric turbulence and prediction of control quality using intelligent decision-making tools

A Modified Disturbance Observer Structure Based on Acceleration Measurement for Disturbance Suppression in Tracking Control System

Modified Fingerprinting Algorithm for Indoor Location

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