Relative pointing error verification of the Telescope Mount Assembly subsystem for the Large Synoptic Survey Telescope

Mutilba, Unai; Kortaberria, Gorka; Egaña, Fernando; Yagüe‐Fabra, José A.

doi:10.1109/metroaerospace.2018.8453570

Cited by 6 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, by locating the M1M3 reference plane on an earth fixed reference system, i.e., the floor, each observation angle for TMA was characterized and compared to the input position, which means the RPE assessment. The measurement process was repeated for each of the pointing positions defined in Figure 2 , and within the pointing range of the LSST [ 2 ]. It should be highlighted that laser tracker position was fixed close to the LSST origin, to nullify the range of the angle of incidence from the laser tracker to the reflectors.…”

Section: Relative Pointing Error Verificationmentioning

confidence: 99%

See 1 more Smart Citation

3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope

Mutilba

Kortaberria

Egaña

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

An engineering validation of a large optical telescope consists of executing major performing tests at the subsystem level to verify the overall engineering performance of the observatory. Thus, the relative pointing error verification of the telescope mount assembly subsystem is of special interest to guarantee the absolute pointing performance of the large synoptic survey telescope. This paper presents a new verification method for the relative pointing error assessment of the telescope mount assembly, based on laser tracker technology and several fiducial points fixed to the floor. Monte-Carlo-based simulation results show that the presented methodology is fit for purpose, even if floor movement occurs due to temperature variation during the measurement acquisition process. A further research about laser tracker technology integration into the telescope structure may suggest that such laser tracker technology could be permanently installed in the telescope in order to provide an active alignment system that aims to detect and correct possible misalignment between mirrors or to provide the required mirror positioning verification accuracy after maintenance activities. The obtained results show that two on-board laser tracker systems combined with eight measurement targets could result in measurement uncertainties that are better than 1 arcsec, which would provide a reliable built-in metrology tool for large telescopes.

show abstract

Section: Relative Pointing Error Verificationmentioning

confidence: 99%

“…Therefore, it provides pointing, tracking, and slewing system performance requirements to comply with the space survey mission [ 1 ]. TMA is currently being assembled in the north of Spain, and the presented method will assess the relative pointing error (RPE) of the subsystem [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope

Mutilba

Kortaberria

Egaña

et al. 2018

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

Uncertainty budget of a large-range nanopositioning platform based on Monte Carlo simulation

et al. 2023

View full text Add to dashboard Cite

A Tanh Control Method for the Third Mirror’s Z Axis of Large Optical Telescope

Zhou,

Xie,

Qian

et al. 2023

IEEE Access

View full text Add to dashboard Cite

The position accuracy of the third mirror's Z axis will directly affect the measurement accuracy of the optical telescope, so it is necessary to improve the position accuracy. In order to improve the control performances of the third mirror's Z-axis of a large optical telescope, this paper proposes a novel control algorithm based on hyperbolic tangent function (tanh). The proposed algorithm is used to replace the traditional integral separated proportional-integral (IS-PI) controller which is widely used in industry servo control system. Firstly, a mathematical model of the third mirror's Z-axis is established. Secondly, a controller based on tanh is proposed, and the characteristics and stability of the algorithm are analyzed. Thirdly, the parameters tuning method of the proposed algorithm is given. The simulation results show that the proposed algorithm has higher tracking accuracy than IS-PI controller. Finally, experiments are carried out on a large optical telescope's Z axis. In the experiments, IS-PI controller and tanh controller are compared, and the results show that the control performances are greatly improved.INDEX TERMS high precision position control, motor control, hyperbolic tangent function, optical telescope, Integral separation proportional integral.

show abstract

Relative pointing error verification of the Telescope Mount Assembly subsystem for the Large Synoptic Survey Telescope

Cited by 6 publications

References 2 publications

3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope

3D Measurement Simulation and Relative Pointing Error Verification of the Telescope Mount Assembly Subsystem for the Large Synoptic Survey Telescope

Uncertainty budget of a large-range nanopositioning platform based on Monte Carlo simulation

A Tanh Control Method for the Third Mirror’s Z Axis of Large Optical Telescope

Contact Info

Product

Resources

About