&lt;title&gt;Enhanced precision pointing jitter suppression system&lt;/title&gt;

Gilmore, Jerold P.; Luniewicz, Michael F.; Sargent, D.

doi:10.1117/12.469751

Cited by 17 publications

(3 citation statements)

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“…A direct feedback loop using position error from high-resolution Position Sensitive Detector (PSD) is utilized to control light in deep space communication by the Draper Laboratory [9,10]. High sample rate inertial sensors, such as fiber optic gyroscopes (FOGs) and the micro-electro-mechanical system (MEMS) accelerometers, have been utilized to compose the acceleration loop, velocity loop and position loop of the multi-loop feedback control (MFC) system, its total disturbance suppression ability (DSA) is the product of the effects of each loop [11,12], but these methods require the installation of additional inertial sensors on the tip-tilt mirror platform, which is detrimental to its small inertia and rapidity, as well as increases space and economic costs.…”

Section: Introductionmentioning

confidence: 99%

Virtual Dual-Loop Feedback Control with Model-Construction Linear Extended State Observer for Free Space Optical Communication

Nie

Ren

Zhou

et al. 2019

Sensors

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The stable alignment and transmission of free space optical communication (FSO) is susceptible to internal dynamics and external disturbances. In this paper, a virtual dual-loop feedback control (VDFC) with model-construction linear extended state observer (MCLESO), which is applied to the fast tip-tilt mirror platform to enhance the disturbance suppression ability (DSA) for FSO. MCLESO, which is modified on a classical linear extended state observer by introducing the available model information, is shown to use the input and output signal data of the system to observe total disturbances, including internal dynamics and external disturbance. Since the position and velocity signals are both observed only with the optoelectronic target detector and MCLESO, the controllers of the dual-loop feedback control (DFC) system are employed directly. This method has a more accurate control performance after model construction, which enhances the DSA of the tip-tilt mirror control system in low and medium frequency. It is also beneficial to miniaturization and cost saving by not using velocity sensors. Both simulations and experiments validate the effectiveness of the proposed method in the tip-tilt mirror control system under the condition of disturbance.

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Section: Introductionmentioning

confidence: 99%

Virtual Dual-Loop Feedback Control with Model-Construction Linear Extended State Observer for Free Space Optical Communication

Nie

Ren

Zhou

et al. 2019

Sensors

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“…In order to achieve the mission objectives, their LOS system must provide precise pointing and tracking capabilities with suppression of jitter to levels of 1–3 micro-radians (rms) or less [ 3 ], especially in deep space laser communications [ 4 ] and directed energy weapons [ 5 ]. As a result, the requirements for the extremely accurate measurement of the LOS jitter are often specified in micro-radians or even nano-radians in wide bandwidth (DC-1K Hz) [ 6 ]. The magnetohydrodynamic (MHD) angular rate sensor (ARS) is developed for its unique advantage of extremely low noise level in ultra-wide bandwidth [ 7 ] and demonstrated in many systems, such as the measurement of angular acceleration in an impact environment [ 8 ], the Relay Mirror Experiment [ 9 ], the Advanced Land Observing Satellite [ 10 ], and the Mars Laser Communication Demonstration program [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Error Analysis of Magnetohydrodynamic Angular Rate Sensor Combing with Coriolis Effect at Low Frequency

et al. 2018

Sensors

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The magnetohydrodynamic (MHD) angular rate sensor (ARS) with low noise level in ultra-wide bandwidth is developed in lasing and imaging applications, especially the line-of-sight (LOS) system. A modified MHD ARS combined with the Coriolis effect was studied in this paper to expand the sensor’s bandwidth at low frequency (<1 Hz), which is essential for precision LOS pointing and wide-bandwidth LOS jitter suppression. The model and the simulation method were constructed and a comprehensive solving method based on the magnetic and electric interaction methods was proposed. The numerical results on the Coriolis effect and the frequency response of the modified MHD ARS were detailed. In addition, according to the experimental results of the designed sensor consistent with the simulation results, an error analysis of model errors was discussed. Our study provides an error analysis method of MHD ARS combined with the Coriolis effect and offers a framework for future studies to minimize the error.

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“…An artificial optical-beam stabilization platform (OBSP) can address the abovementioned issues. Some airborne and satellitebased electro-optical systems, such as the stratospheric observatory for infrared astronomy and advanced land observing satellite, have employed an OBSP as a high-precision inertial reference to measure the optical-beam jitters [10], [11]. The OBSP, which is placed in the optical path of a largeaperture electro-optical system, is a compact installation with low drift, precise attitude determination, and wide-band dynamic characteristics.…”

mentioning

confidence: 99%

Performance Evaluation of Optical-Beam Stabilization Platforms With Different Supports Used in Large-Aperture Electro-Optical System

et al. 2022

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Optical-beam stabilization platform (OBSP) provides high-precision inertial reference for measurement of full link optical-beam jitter in large-aperture electro-optical systems. To ensure that its optical-beam stability meets system alignment needs, performance evaluation of OBSP is necessary. Considering two OBSPs with flexible and rigid support, their optical-beam stability performance and effect on image quality are evaluated and compared via theoretical and experimental means. The results reveal that under same sensor and control algorithm conditions, the two OBSPs perform well on dynamic-frequency characteristics and two-axis motion decoupling, they can achieve dynamic opticalbeam stabilization accuracy of 7.934 µrad and 5.762 µrad under 0.5-100Hz wide-band excitation, respectively. Moreover, optical systems equipped with OBSPs demonstrate better imaging performance (MTF value of 21% at 50 lp/mm with stable residuals of less than 7 µrad). The findings of this study provide a ready reference for the design of meter level large-aperture electro-optical systems for applications in laser communication, aerial imaging, etc.

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<title>Enhanced precision pointing jitter suppression system</title>

Cited by 17 publications

References 0 publications

Virtual Dual-Loop Feedback Control with Model-Construction Linear Extended State Observer for Free Space Optical Communication

Virtual Dual-Loop Feedback Control with Model-Construction Linear Extended State Observer for Free Space Optical Communication

Error Analysis of Magnetohydrodynamic Angular Rate Sensor Combing with Coriolis Effect at Low Frequency

Performance Evaluation of Optical-Beam Stabilization Platforms With Different Supports Used in Large-Aperture Electro-Optical System

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